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Dellorto Carburetors

December 24, 2014

History:  (from WikipediaDell’Orto is an Italian company, headquartered in Cabiate, specialized in the construction of carburetors and electronic fuel injection (EFI) systems. The company was founded in 1933 as “Società anonima Gaetano Dell’Orto e figli” (Gaetano Dell’Orto and Sons). Their first products were carburetors that came fitted as standard to new vehicles. Shortly before the second world war they began producing carburetors with aluminum bodies for use in motorcycle racing. At the beginning of the 1960s Dell’Orto was producing OEM carburetors for the Fiat group, as well as other Italian and foreign constructors (i.e.Flandria, Belgium). At the end of the 1980s, under the supervision of Luigi Dell’Orto (son of Gaetano), the company’s first injection systems were released.

 The company is today one of the worldwide leaders in the field of carburation and is present in the sport field as partner of Gilera that participates in the Road Racing World Championship. It is also used in every modern Derbi, Aprilia, and Yamaha 50cc model.

Contents:
1. Type SHA     2. Type SHA “Vespa”
3. Jets   4. SHA Service   5. Type PHVA

 

Dellorto carburetor types: The first few letters of the ID number are the type. Carburetors for each type are made in different sizes and configurations, but look mostly the same and share most of the same parts.

Dellorto threads: Many Dellorto carburetor bodies get ruined or “stripped” by using the wrong screws. 

Bolt Size >       3mm  4mm   5mm   6mm
regular pitch     0.50   0.70    0.80   1.00       So the Dellorto M4 is coarser (threads farther apart) than normal M4
Dellorto pitch    0.50   0.75    0.75   1.00       and the Dellorto M5 is finer (threads closer together) than normal M5 

 


1. Dell’Orto “SHA”

The Dellorto SHA is a family of Italian moped or mini-bike carburetors. SHA’s have flat throttle slides and no jet needles. They all have the same outer size and main body appearance, with a 59mm round flange for an air filter. They have been produced for in Italy from the 1960’s to the 2000’s. In particular the Dellorto SHA 14/12 and 14/9 carburetors were on tens of thousands of US mopeds from 1976 to 1985. The Spanish moped Derbi had Arbeo-Dellorto carburetors, made in Spain under license. They were more goldish colored, and tended to leak fuel past the float seat. Since the 2000’s there are Asian remakes.

Carburetor Size: The venturi is where the air mixes with gasoline. It is also where the air passage gets narrower, to cause a higher air speed in order to atomize or break up the liquid fuel into smaller droplets. With Dellorto SHA carburetors, two numbers are used to describe the size of the venturi. The first number is the venturi exit, and the second number is the venturi entrance. So looking at an SHA 14/12 from the front you see a 12mm hole, and from the back (engine side) you see a 14mm hole.

Choke Type: The choke is a lever you push or pull, “on” for cold starting, or “off” for normal running. There are three types used on Dellorto SHA carburetors:

A  direct lever  push down lever on carb to put choke “on”, give full throttle to release it “off”
B  linkage lever  same operation as direct lever
C  cable choke  cable goes to a handlebar thumb lever, pull to put choke “on”, let go for “off”    

Cable choke is needed when the carburetor choke lever cannot be reached by hand.

Original carburetors    choke  approx. clamp  xxx    fits on
  ID #   size xxxxxxxx  type xx years   size  sleeve  intake  stock jets    applications


SHA 14/9 xxxxxxx  A lever  1960-90  20   20-16  16.00  44, 46, 48  20-25mph mopeds
SHA 14/9
 xxxxxxx  A lever  1960-90  20   20-18  18.00  

SHA 14/12
 xxxxxx  A lever  1960-90  20   20-16  16.00  48, 50, 52  25-30mph mopeds
SHA 14/12 
xxxxxx  A lever  1960-90  20   20-18  18.00
SHA 12/12 C Arbeo A lever  1970-85  20   20-18  18.00  50, 52, 54  ’75-86 Derbi
SHA 12/12 C Arbeo C cable 1980-90  20   20-18  18.00  50, 52, 54  ’86-90 Derbi
SHA 14/12 P
 
oebrA B lever  1985-on  21   21-18  18.00  00, 51, 53  ’86-06 Tomos

Replacement carburetors     xxxxx   clamp  xxxxx  fits on  jet  price   air filter
x ID #  size x choke type  options xx  size  sleeve  intake  jet  price   and cover


SHA 14/12 L  A lever  change sleeve  21   21-16  16.00  57  $80  #39 clip cover
SHA 14/12 L  A lever  change sleeve  21   21-17  17.00  57  $80  same
SHA 14/12 L  A lever  change sleeve  21   21-18  18.00  57  $75  same
SHA 14/12 L  A lever  change sleeve  21   21-19  19.00  57  $80  same
SHA 14/12 L  A lever  remove sleeve 21  .  none  21.00  57  $75  same
SHA 14/12 C cable 
 no sleeve xx   1 . .none  19.00  ??  $80  clamp type box
SHA 14/14 R  C cable  no sleeve xx   19  . .none  19.00  ??   N/A  clamp type box
SHA 15/15 L  A lever  change sleeve  21   21-16  16.00  68   N/A  #39 clip  cover
SHA 15/15 L  L lever  change sleeve  21   21-17  17.00  68   N/A  same
SHA 15/15 L  L lever  change sleeve  21   21-18  18.00  68   N/A  same
SHA 15/15 L  L lever  change sleeve  21   21-19  19.00  68   N/A  same
SHA 15/15 L  L lever  remove sleeve 21   . none  21.00  68   N/A   same
SHA 15/15 C  C cable change sleeve  21   21-16  16.00  70   $85  #39 clip cover
SHA 15/15 C  C cable change sleeve  21   21-17  17.00  70   $85  same
SHA 15/15 C  C cable change sleeve  21   21-18  18.00  70   $85  same
SHA 15/15 C  C cable change sleeve  21   21-19  19.00  70   $80  same
SHA 15/15 C  C cable remove sleeve 21   . none  21.00  70   $80  same

Clamp size: These new replacement carburetors only clamp tight when the intake pipe is exactly the right size. Many intakes are made slightly smaller or become smaller from wear. When the clamp screw is tightened fully, the carburetor can still move, and eventually slip off. For a 18 sleeve, a 18.00 to 18.10 pipe would clamp tight, but 17.95 or less pipe would not clamp tight. That is not very much forgiveness.

Cut up a can: A strip cut out from an aluminum can, with scissors, can be placed under the sleeve. Thickness is 0.1mm. Either a 1/3 circle or a full circle can be used, as needed. A full circle adds 0.2 to the clamp diameter, for a 17.80 to become 18.00. A 1/3 circle adds 0.1 mm, for a 17.90 to become 18.00. A thin aluminum baking pan is thinner than a can. A thinner full circle is better for when only a little is needed.

Most brand new original Garelli, Minarelli, and Tomos intake manifolds (pipes) are 18.00. But some are 17.95, and actually need a 1/3 strip of aluminum can inserted in order to clamp tight and proper, with new original carburetors.

 


Cable pipes: for redirecting the throttle cable
Thread is M6-0.75. Adjuster is M5-0.75.
A throttle cable end can pass through, except 2d.
Bikes with front carburetors don’t need them,
because the cable goes straight up. Others have
gas tanks or floor boards that the cable must go
under or around.

                                        P A R T S    L I S T
    old Dellorto#
   Dellorto#  new

#   Minarelli# lnew
#     Garelli#  used  

pic# Tomos#  price    description          specification


1     1476-06 $2.00 rubber boot long
1
a 
  1476A $2.00 rubber boot short   219624
2     1104-37 $4.00 carb top adjuster M6-0.75 A13
2a   7423-35 $13.0 cable pipe bare Vespa xx 22×30 90º use 2l
2b   3698-35  N/A   cable pipe bare Min 6560 20×28 90º use 2l
2c   3600-35 $13.0 cable pipe bare Min. 6680   long 70º use 2i
2d   0pipe2d $7.00 cable pipe bare Derbi  long 70º (with cable)
280210400$7.00 cable pipe bare Garelli  medium 35º use 2o
2163515835$15.0cable pipe bare Garelli VIPshort 45º use 2n
2g   0pipe2g $4.00 cable pipe bare xxxx 30×27 90º no 3a
2h    219623 $5.00 cable pipe bare Tomos med. 70º no 3a
2i     003600 $5.00 cable pipe bare 6680    long 70º no 3a
2j     0pipe2j $5.00 cable pipe bare xxxxx  med. 32º no 3a
2k   0010854 
 N/A   cable pipe bare xxxxxx long 50º no 3a
2l   0003698 $5.00 cable pipe bare Vesp 22×30 90º no 3a 
2n    0pipe2n  N/A   cable pipe bare xxxxxx long 40º
2o
    0pipe2o  N/A   cable pipe bare xxxxxx short 45º

2p  0-53036 $9.00 cable pipe set xxxxxx 1+2l+3a
2q  0-53037 $12.0
cable pipe set xxxxxx 1+2h+2i+3a
2r   0-53038  N/A
    cable pipe set xxxxxx 1 +2k+3a  long 50º
2s  0-53073  N/A
    cable pipe set xxxxxx 1a+2j+3a med. 32º 
2
t   0-53040 $9.00 cab. pipe set 11630cu 1+2g+3a 30×27 90º
2u   265146  N/A
    cable pipe set Malossi 1a+2o     short 45º
2v  0-53058  N/A
    cable pipe set xxxxxx 2n+3b      long 40º
3     1691-27 $2.00 carb top nut M6-0.75  not M6-1.0 regular

12, 12a, 12b slides #1, #2, #12 and others

3a    219625 $5.00 pipe adjuster+nut M5-0.75  not M5-0.80
3b   1692-27 $3.00 pipe adj. nut only M5-0.75  not M5-0.80
4
     3318-36 $2.00 top screw M4-0.75 x 14 slot not M4-0.70
5     5011-23 $0.20 washer M4 
     06110M $5.00 top bare metal  6320
6a   6110-53 $5.00 top bare white plastic
6   00-6110  N/A   top bare black plastic
6c     219596 $16.0 top bare black angled hole 30° 85-06 Tomos
6  topass6d $15.0 top assy metal   6+7+8+9+10
6  topass6e $15.0 top assy white  6a+7+8+9+10
6f    0-13662  N/A    top assy black  6b+7+8+9+10
7     6115-22 $2.00 hinge pin (in top) 6510
8     6259-61 $2.00 spring choke (in top) 6460
9     6112-26 $5.00 lever choke trigger 6450
10   6111-30 $3.00 gasket for carb top 6410
11   3346-61 $10.0 spring throttle return 6480
12   6108/64 $10.0 slide throttle #1 metal 219580 6590 25mph
12a 6108/2x $10.0 slide throttle #2 metal 20mph
12b 00-6108  N/A    slide throttle #12 plastic
13   4190-36 $4.00 screw 6620 M5-0.75 x 15 not regular metric
14   3385-30 $1.00 seal washer 5 x 9 for metal banjo not plastic
15   9249-38 $15.0 banjo metal angled out 6530 3/16″

15a  219584 $15.0 banjo inlet metal straight 3/16″
15b 00-9249 $8.00 banjo plastic angled out 6535 3/16″
15c Derb15b  N/A    banjo inlet thick 1/4″ put a thin hose over 15a
16   6109-29 $5.00 filter fuel plastic mesh 6360
17   6304-27 $2.00 nut M6 teardrop 6350 most have regular nut
18   6159-30  N/A    gasket for air filter 6420
19   7179-61 $3.00 spring for choke plate 6470
20   6112-26 $7.00 choke plate-lever short  type A lever choke
20a 6114-64 $7.00 choke plate-lever medium 6570
20b 8026-50 $7.00 choke plate-lever long  6580  Cimatti type
21   5417-22 $3.00 pivot step-bolt choke 6520
22   8773-22 $2.00 hinge pin 6500 Ø2.0 x 16.5 
23a 0-14148 $7.00 21-16 sleeve, inner lip for 16.00 mm intakes
23b 0-12914 $7.00 21-17 sleeve, inner lip for 17.00 MB (some)

23c 0-10811 $7.00 21-18 sleeve, inner lip for 18.00 mm intakes

23d 0-11362 $9.00 21-18 sleeve, outer lip for 18.00 mm intakes
23e  227324 $4.00 rubber ring,  for 23d  21 x 16 x 3.5 angled
23e  227324 $5.00 only for carbs that have sleeve 23d Tomos
230-10146 $7.00 21-19 sleeve, inner lip for 19.00 Peugeot, MB

23g 6124-62 $5.00 20-16 sleeve, inner lip for 16.00 Morini MO1
23g continued  Demm, Benelli G2, Tomos ’74-85, Batavus M48
23h 6448-62 $7.00 20-18 sleeve, inner lip for 18.00 Minarelli V1,
23h continued  Garelli, Tomos ’85-06, Morini M1

23i  19-17    $22.0 19-17 sleeve,
inner lip for Motobecane (some)
23j  114482 $12.0 18-16 sleeve, inner lip for Vespa type SHA

24   6305-36 $2.00 clamp bolt M6-1.00   
25   6140-37 $4.00 idle screw M4-0.70 x 25 regular metric !
26   3606-61 $2.00 spring idle Ø4 Ø6 x 12  
27   2828-05 $10.0 float needle valve
28   1486/42 $5.00 jet 42 0.0178″=0.451  M5-0.75 thread (all)
28   1486/43 none   jet 43 0.0182″=0.462 pre-78 Ciao & Bravo
28   1486/44 $5.00 jet 44 0.0186″=0.472
28   1486/45 none   jet 45 0.0190″=0.483 78-on Ciao & Bravo
28   1486/46 $5.00 jet 46 0.0194″=0.493
28   1486/47 $7.00 jet 47 0.0198″=0.503
28   1486/48 $5.00 jet 48 0.0202″=0.513 most 20mph mopeds
28   1486/49 $7.00 jet 49 0.0207″=0.525 78-on Vespa Grande
28   1486/50 $5.00 jet 50 0.0210″=0.533 76-80 Garelli (some)
28   1486/51 $7.00 jet 51 0.0215″=0.546 85-91 Tomos late A3
28   1486/52 $5.00 jet 52 0.0219″=0.556 most 30mph mopeds
28   1486/53 none   jet 53 0.0223″=0.566 92-95 Tomos early A35
28   1486/54 $5.00 jet 54 0.0227″=0.577 86-90 Derbi (flat reed)
28   1486/55 none   jet 55 0.0231″=0.587
28   1486/56 $5.00 jet 56 0.0235″=0.597 96-06 Tomos late A35
28   1486/58 $5.00 jet 58 0.0242″=0.615
28   1486/60 $5.00 jet 60 0.0247″=0.627 96-06 Tomos+exhaust
28   1486/62 none   jet 62 0.0255″=0.648
28   1486/64 none   jet 64 0.0262″=0.665
28   1486/66 none   jet 66 0.0268″=0.681
28   1486/68 none   jet 68 0.0274″=0.696
28   1486/70 none   jet 70 0.0280″=0.711
29   6122-80 $18-$12 float all white plastic
30   612300 $4.00 gasket rubber ring all new ones are round
31   6107-96 $5.00 float bowl metal
31   0 13412 $5.00 float bowl plastic          
32   3598-36 $4.00 screw M4-0.75 x 18  not regular metric
33   4611-50 $5.00 clamp w/nut M4-0.75 
34   4617-36  N/A    screw M4-0.75 x 25 re-thread nut to use #8-32
35   6117-86 $12.0 air filter metal screen
36   7758-85 $15.0 air box small thin type no tubes 40
37   8605-85 $18.0 air box large thick type no tubes 41
38   5660M   $15.0 air box Minarelli type black new Malossi
38  005660   $25.0 air box Minarelli type gray used original
39   0-53051 $17.0 air cap, clip and screen set
39a  53051a $10.0 air cap only    this needs a bigger jet
39b  53051b $6.00 clip only
40   7195-35 $7.00 restricter tube small Ø8×20
41   5309-35 $8.00 restricter tube large Ø9×50   
42  6090813 $22.0 air filter aftermarket  this needs a bigger jet

39b clip, 39a air cap

43C  53057   $8.00 cable choke plate set type C  43a+43b+21
43a  plate43  $6.00 cable choke plate only  type C
43b spring43 $3.00 cable choke spring only
44B  223025 $7.00 pivot shaft w/linkage  type B, gets rounded
45B  223027 $2.00 spring for pivot shaft  type B 
46B  223026  N/A    choke plate xxxxxxx type B
47B  223028 $7.00 choke lever external B, gets hourglass-shaped
48B  031930 $1.00 lock washer M4  B, better to weld 46,47,49
49B  031073 $1.00 nut M4-0.70      B, better to weld 46,47,49

42 compact air filter
Fits 1996-06 Tomos

50   g-set50 $6.00 gasket set for y’all  10, 14, 30
51  0-52533 $10.0 gasket set pre-’85  10, 14, 30, 18, 18, 1a, 55, 56
51  0-52533 $10.0 for older SHA pre-1985 with 20mm clamp size

52  0-52579 $12.0 gasket set post-85 10, 14, 30, 18, 23e, 23e, 57
52  0-52579 $12.0 for newer SHA 1985-on with 21mm clamp size

55  0-ring55 $2.00 square rubber ring 14 x 20 x 2.0 for some pre-85
55  0-ring55 $2.00 only for 20mm intakes (when no sleeve is installed)

56  0-ring56 $1.00 tiny rubber o-ring  3 x 6.5 x 1.75 only for  ?
57  0-ring57 $2.00 square rubber ring 15 x 21 x 2.0 for some post-85
57  0-ring57 $2.00 only for 21mm intakes (when no sleeve is installed)

50, 51, 52 Dellorto SHA gasket sets (guarnizioni)

 

 

 

 

 

 

 

 

 

 

Tomos Parts
51 219374 $15.0 junction sleeve center mount 85-95 A3+A35
52 219373 $19.0 air box bare (silencer) xxxx   85-95 A3+A35
53 214330 $12.0 inlet tube Ø12.5×60 straight 85-91 A3 (pre-85 with Encarwi was Ø9)
53 223606 $9.00 inlet tube Ø12.5×110 curved 92-95 A35


55 229705 $14.0 junction sleeve side mount x  96-06 A35
56 229706 $2.50 inlet grommet xxxxxxxxxxxx 96-06 A35
57 229769  N/A    air box assy 57, 58, 59 xxxx 96-06 A35
58 044438 $1.00 air box screw xxxxxxxxxxxxx 96-06 A35
59 229704  N/A    air filter foam xxxxxxxxxxxx  96-06 A35

60 025195 $0.60 intake screw M6x30 hex xxx  85-91 A3
61 026289 $0.50 intake screw M6x18 hex xxx  85-91 A3
62 031932 $0.20 washer M6 xxxxxxxxxxxxxx   85-91 A3
63 219371 $15.0 center intake A3 xxxxxxxxxx  85-91 A3
63 219564 $18.0 center intake A3 (oil inject)    85-91 A3
64 219372 $5.00 intake gasket thin xxxxxxxx   85-91 A3

65 026566 $1.50 intake screw M5x20 allen xx  92-95 A35
66 031931 $0.20 washer 5mm xxxxxxxxxxxxx  92-95 A35
67 227592  N/A    center intake A35 (oil inject)  92-95 A35
68 223748 $3.00 reed valve gasket xxxxxxxxx  92-06 A35
69 222238 $34.0 reed valve 2-petal xxxxxxxx   92-06 A35
70 229707  N/A    side intake (no oil inject.) xx  96-06 A35
71 229716 $21.0 side intake (oil injection) xxx  96-06 A35

An oil-injection intake has a M6-threaded hole for the oil line. A no-oil injection intake does not.
Plug the hole with a M6x8 bolt and M6 seal washer, to convert oil-injection to no oil injection. 

 


 

Choke Sticking On: Often the choke sticks on, for no apparent reason. The throttle cable is sometimes too loose to pull up the choke trigger. More often, the choke trigger lever has become bent or twisted. This happens often because great care must be taken to keep the trigger against the side wall when the top assembly (throttle slide, choke trigger, cover assembly) is installed. Before the top screws are tightened, and with one finger holding the top in proper position, it is wise to test the choke by directly pulling on the throttle wire. It should click off at full throttle. Only then should the screws be gently tightened, while holding the top with that finger. If not, then inspect the trigger lever for misalignment, and re-align carefully with small pliers. Sometimes rounding off the side edges helps the trigger lever to not stick also. The last resort is to replace it, but pushing out the tiny hinge pin is difficult. So it is better to straighten it.  

 


2. Dell’Orto “SHA Vespa”

Welcome. The Dellorto “SHA Vespa” is like a regular “SHA” but more compact. It has a smaller 50mm air filter flange, not 59. This style of carburetor was original on all Vespa/Piaggio mopeds 1970’s, 1980’s, 1990’s, and 2000’s. In the USA it was on 1972-86 Vespa mopeds, 1983-86 Garelli VIP-N, and mid 1990’s Kinetic TFR mopeds. 

The SHA Vespa carburetor has an improved choke release trigger, that cures the sticking trigger lever problem that the regular early SHA had. Vespa types have a sliding push rod, that moves up a ramp in the throttle slide when the throttle is raised fully. The solid rod pushes the choke lever/plate over a little stop tab. The torsion spring is then free to snap it back off. The top is relatively easy to put on, with only the throttle slide and spring to install, no choke device that gets damaged easy, not even a top gasket.

   ID number xxx  choke  approx.  clamp  xxx  fits on
  xxxxxx size xxxxx type x  years xsize  sleeve intake
  stock jets    applications
SHA 12/7
 xxxx0x lever  1960-90  18   18-16  16.00  39, 40, 00  20mph Vespa mopeds
SHA 12/
10 xxxxx lever  1960-90  18   18-16  16.00  00, 43, 45  25mph Vespa mopeds
SHA 12/
12 xxxxx lever  1960-90  18   18-16  16.00  00, 00, 48  30mph Vespa mopeds
————————————————  replacement carburetors  ———————————-
SHA 12/10
 xxxxxlever 1990-on  18   18-16  16.00  00, 00, 48   comes with 18-16 sleeve
SHA 12/10
 xxxxx lever  1990-on  18 .
none   18.00  00, 00, 48   remove sleeve
SHA 13/13
xxxxx lever 1990-on  18   18-16  16.00  00, 00, 48   comes with 18-16 sleeve
SHA 13/13
 xxxxx lever 1990-on  18 . none   18.00  00, 00, 48   remove sleeve

 

There were 3 carb bodies, 7, 10, and 12mm, 5 jet sizes, 39, 41, 43, 45, 49, and 2 air filter boxes, 3-hole and 6-hole.
The Boxer had a side-pull carb top assy, like Peugeot. It gives more frame clearance. After 1979 the Boxer became the Si. 
There were 4 choke levers, Grande, Bravo, Ciao, Boxer. The later Boxer 2 had the linkage type choke with pull wire.

 

1980s Vespa Carburetors

There are 3 carb bodies, 7, 10, and 12mm, 4 jets, 39, 42, 45, 49.
The Ciao P and Bravo P had top pull, and Si had a side-pull carb top assy.
There are 3 choke levers, Bravo-Ciao, and Si, linkage type, and Grande.
There are 2 air filter boxes, 3-hole and 6-hole. Some are newer designs.

 

Prices in green are for new, dark green are for used items.

pic# Vespa #      description        price      remarks

SHA12.12 Vespa bare body           $70  Grande 25 & 30mph
SHA12.10 Vespa bare body           $50  Ciao, Bravo, Si 25 & 30mph
SHA12.7  Vespa bare body            $60  Ciao, Bravo, Grande, Si 20mph

1  098128 cable adjuster M5-0.75  see above Dellorto 3a
2  120074 lock nut M5-0.75           see above Dellorto 3b
3  113903 elbow 90º M6-0.75        see above Dellorto 2a
4  120073 lock nut M6-0.75           see above Dellorto 3
5  113906 screw M4-0.75×14 flat    see above Dellorto 4
6  113902 carb top top-pull type     $12  there’s no carb top gasket
7  113901 spring throttle Ø11 x 26  $10
8  135734 throttle slide 21x26x3    $15 also has a ramp to release choke 
9  124753 rubber washer 2x7x1.5   $3 slides into a pocket from the side
10 124598 slide rod Ø2 x 35          N/A like Peugeot (28mm) but bigger
11 124597 rocker arm Ø5 hole       N/A
12 092403 step bolt Ø5/M4-0.75    N/A Ø5 x 2 step, M4-0.75 x 10 shank
13 016320 thin washer M5             see hardware M5  thin washer
14 014404 lock washer M4             see hardware M4 lock washer
15 012012 nut M4-0.75                 N/A not a regular M4-0.70
16 124752 screw M4-0.75×10 sunk N/A can substitute a flat head
17 098130 spring Ø5 x 7 x 12          $3
18 098128 cable adjuster M5-0.75  see above Dellorto 3a
19 124596 carb top side-pull type  N/A  above this line “carb top” assy
21 133921 choke lever Ciao            $6 below this line “bottom” assy
22 353882 choke lever Grande       $15
23 140342 choke lever Bravo         $17 very long
24 113917 inlet bolt M5-0.75 x 18  $10 can not be normal M5-0.80
25 082920 seal washer 5 x 8           $3 can not be normal 5 x 10
26 113914 banjo fuel inlet            $10-$5
27 113916 fuel filter  Ø11 x 8         $12-$7
28 113915 seal washer 11 x 16         $8
29 114482 intake sleeve 16 x 18     $25 smaller than 20mm, regular SHA
29 222222 rubber washer 12x18x2  $2 not for 70’s Vespa moped
30 113926 bolt M6-1.0 x 20            $5 special small head
31 113927 thin nut M6-1.0             see hardware M6 thin nut
32 113923 spring for choke plate     $4 torsion spring
33 113922 pivot bolt choke            $4 shoulder bolt
34 098135 spring for idle screw       see above Dellorto 26
35 113919 idle screw M4-0.70         see above Dellorto 25
36 164149 choke pull rod               N/A Bravo P, Si
37 188772 choke pull rod               N/A Ciao P
38 186413 coupling pipe (clip)        N/A Si, Ciao P, Bravo P
39 212930 bracket                       N/A Bravo P
40 188164 bracket                       N/A Ciao P
41 164147 choke plate long flat      N/A Si
42 188162 choke plate short bent   N/A Ciao P, Bravo P
43 main jet M5-0.75 thread           see below Dellorto Jets 
     120519 jet 39    20mph 1978-on Ciao, Bravo, Grande, Si, Ciao P
     135233 jet 41    25mph 1980-83 Si, 30kph(19mph) 1984-on Bravo P
     191125 jet 42    25mph 1980-on Ciao P
     113912 jet 43    30mph 1980-on Si, 1968-77 Ciao, 1972-77 Bravo
     130525 jet 45  30 & 25 1978-83 Ciao, Bravo
     158780 jet 49  30 & 25 1978-85 Grande, 30mph 1984-on Ciao P, Bravo P, Si

Vespa air filters L, 3-hole, R, 6-hole. Row 1 covered: L Kinetic, R Grande. Row 2 open: L, Ciao, R, Ciao P

Vespa air filters: L, 3-hole, R, 6-hole.
Row 1 covered: L, Kinetic, R, Grande.
Row 2 open: L, Ciao, R, Ciao P

44 090506 float needle             see above Dellorto 27
45 113910 float all plastic           $35-$25 says 2.5 grams 7420.1
46 113909 gasket float bowl          see above Dellorto 30
47 085291 hinge pin Ø2.0 x 16.5  see above Dellorto 22
48 113908 float bowl metal           $12 – $7
49 098134 bowl screw M4-0.75×18  see above Dellorto 32
50 131009 air filter screen              $15
51 113055 clamp air filter w/screw  $12
52 000000
53 113347 air filter 3-hole open       $35 68-80 Ciao, Bravo (20,25,27)
54 306922 air filter 6-hole covered  $50 78-86 Grande (20, 25, 30)
55 183423 air filter 6-hole open       $60 81-86 Ciao PX (30mph)
56 186886 air filter 3-hole open      N/A 80-86 Si, Ciao PX (20, 25)
57 000000 air filter 3-hole covered  $40 95-99+ Kinetic TFR
58 000000

 

 


3. Dell’Orto Jets

4, 5, or 6 millimeter

Thread Size: Dellorto jets in mopeds come in three thread sizes 4, 5, and 6 millimeter. Each thread size has maybe a hundred different jet sizes. They all fit and look the same but have different size pin holes. 

Jet Number: Jets have a number stamped on them indicating the hole size. The number can have different meanings for different jet makers.

Left, genuine (with “diamond INC” logo)
Right generic (with different or no logo)

For generic Dellorto jets the jet number is the mm size.
A generic Dellorto 60 is 0.600 mm.

For genuine Dellorto jets the jet number is less than the mm.
A genuine Dellorto 60 is 0.627 mm.

So a genuine 60 is in-between a generic 62 and 63.
This sounds wrong but is true!

How this was determined: Below is a graph of 17 genuine Dellorto 5mm jets actual sizes. The direct measurement was done with a set of machinists wire gauges, in increments of 0.001″. You can see how the measured sizes fall nicely on two lines. The line for over-56 has less slope than the line for under-56. You can also see what drill sizes correspond to what jet sizes. This study was done in 2002 before there were generic jets. It was surprising to learn that the stamped number did not mean the millimeter size.

Dellorto Jet Sizes Graph, drawn in 2002

Genuine 6413 (6 mm) Jets (M6-0.75 thread)
##  inch size mm     price
    applications
52 0.0219″=0.556   $10 A55 smaller for high altitude
55
 0.0231″=0.587   N/A Tomos A55 243160 original
58 0.0242″=0.615   N/A Tomos A55 bigger
60 0.0247″=0.627   N/A Tomos A55 bigger

Genuine 1486 (5 mm) Jets (M5-0.75 thread)
genuine       closest generic
##  inch size mm   ##    price
    applications
42 0.0178″=0.451  45   $5.00
43
0.0182″=0.462  46   none   pre-78 Ciao & Bravo
44 0.0186″=0.472  47   $5.00
45 0.0190″=0.483  48   none   78-on Ciao & Bravo
46 0.0194″=0.493  49   $5.00
47 0.0198″=0.503  50   $7.00
48 0.0202″=0.513  51   $5.00 most 20mph mopeds
49 0.0207″=0.525  52   $7.00 78-83 Vespa Grande

Dellorto Jet Sizes Graph, improved in 2019

50 0.0210″=0.533  53   $5.00 76-80 Garelli (some)
51 0.0215″=0.546  55   $7.00 85-91 Tomos A3
52 0.0219″=0.556  56   $5.00 almost all 30mph mopeds
53 0.0223″=0.566  57   none   92-06 Tomos A35
54 0.0227″=0.577  58   $5.00 86-90 Derbi (flat reed)
55 0.0231″=0.587  59   none  
56 0.0235″=0.597  60   $5.00
58 0.0242″=0.615  62   $5.00
60 0.0247″=0.627  63   $5.00
62 0.0255″=0.648  65   none  
64 0.0262″=0.665  66   none  
66 0.0268″=0.681  68   none  
68 0.0274″=0.696  70   none  
70 0.0280″=0.711  71   none  

Genuine 11600 (4 mm) Jets (M4-0.70 thread)
##  inch size mm     price
    applications
25
 0.0107″=0.272     $8  Tomos A55 pilot (idle) jet
29 0.0124″=0.314     $8 
30 0.0128″=0.325     $8  good for A55 pilot jet
32 0.0140″=0.355     $8  same as #80 drill
35 0.0149″=0.378     N/A
40 0.0170″=0.431     $8
42 0.0178″=0.451     N/A
44 0.0187″=0.475     N/A
45 0.0190″=0.483     $8
48 0.0202″=0.513     $8  Sachs 504/1A and 505/1A (without air filter box)
50 0.0210″=0.533     N/A
55 0.0230″=0.580     $8
60 0.0250″=0.635     $8

 

 


4. Dell’Orto SHA Service

 

The Dellorto SHA idle hole is in the silver zinc body, at the base of the brass spray tube

Cleaning a Dellorto idle hole with a tiny #71 drill and a pin vise

Cleaning a Dellorto idle hole with a tiny #71 drill and a pin vise

 

 

 

 

 

 

 

 

Here is the engine side view of a Delorto SHA carburetor. At the base of the vertical brass “spray tube” with one or two holes in it, there is a tiny hole in the silver metal below the brass. It gets overlooked frequently. When it is blocked, the engine will not stay idling for more than a few seconds, but will otherwise run fine if the throttle is kept open.

 

 


5. Dell’Orto PHVA14

Welcome. This is a “third generation” Tomos carburetor, on US mopeds. It is preceded by two others, the Encarwi A83 on Tomos A3 1974-85, and the Dellorto SHA 14-12P on Tomos A3 1986-91 and A35 1992-06.

 

Dellorto PHVA14 Tomos A55 carburetor four views

 

Dellorto PHVA14 parts

0    233730 Carburetor PHVA 14 DD  N/A right side, no drain
1    243115 Rubber Boot for cable      see above Dellorto SHA 1
2    243116 Adjuster w/nut M5-0.75   see above Dellorto SHA 3a+3b
3    243152 Throttle Cable Guide 72º  see above Dellorto SHA 2c
4    243118 Screw M5-0.80 x 14        see hardware M5 x 15 screw
5    243119 Carburetor Top Cover      N/A
6    set only Rubber “figure 8” gasket  N/A see 40 below
6    T
he wrong one, paper kind, is shown. Actual Tomos kind is rubber.
7    243120 Throttle spring Ø12 x 52   N/A
  243121 Throttle slide insert         N/A
9    243103 Throttle Slide #40 Ø15    N/A
10  243122 E-clip 1.5mm for needle     $2 1.3 at opening, for 1.5 groove
10a 222222 Substitute E-clip 1.5mm    $2 1.3 at opening, for 1.5 groove
11  243104 Needle A07 2.0-1.0 x 38  $30 2.0mm needle, 1.5 clip groove
Dellorto PHVA throttle needle and substitute11a 222222 substitute 2.0-1.1 x 38     $8
12  ——————————————-
13  243125 Choke Lever bare            N/A
14  choke o-ring rubber o-ring 18 x 20  $4
15  243123 Screw M4-0.70 x 10       see hardware M4 x 10 screw
16  243124 Clamp for choke lever      N/A
17  243151 Choke Assy 13,14,15,16 N/A
18  243126 Spring Idle Air Ø5,Ø7 x 9   $8
19  243147 Idle Air Screw M5-0.50    $18
20  future use
21  243128 Spring for Idle Ø5,Ø7 x 14 $8
22  243148 Idle Spd. Screw M5-0.80  $18
23  243106 Needle Housing 209GA     $17
23a 222222 Needle Housing 210GA    $15
24  243160 Main Jet M6-0.75 size 55  N/A original A55 size #55
24a D64-052 main jet M6-0.75 #52   $10 smaller for high altitude
24b D64-058 main jet M6-0.75 #58   N/A bigger
24c D64-060 main jet M6-0.75 #60   N/A bigger
26  243222 Idle Jet M4-0.70 size 25   $15 original A55 size #25
26a D11600x29 idle jet M4-0.70 #29   $12 bigger
26b D11600x30 idle jet M4-0.70 #30  $12 bigger
26c D11600x32 idle jet M4-0.70 #32    $7 bigger
26d D11600x40 idle jet M4-0.70 #40    $7 way bigger
28  243162 Choke Jet M5-0.80 #40      $5 regular metric thread
30  243114 Float all plastic bare         $25
31  243149 Float w/Needle Valve        $45
32  243131 Float Needle Valve           $35
34  set only Rubber o-ring                  N/A bigger than SHA one
3
5  243132 Hinge Pin Ø2.0 x 19.5        $7
36   243150 Float bowl plastic            N/A

Dellorto PHVA Gaskets

Dellorto 52622 PHVA Gasket Set
Right: 6,14,34    Left: others

37  027057 Screw M4-0.70 x 18         see hardware M4 x 18 screw
40  236460 Gasket set 6,14,34 only     $20
40    52622 Gaskets 6,14,34 +others  $25
    others Gaskets others only         $10
45  233740 Intake silencer assy
46  233741 Air Filter Foam
47  233748 Junction sleeve
48  221584 Clamp 32-50

 

 


Jet Drills

January 27, 2007

Find out more about the Jet Drills »