Dellorto SHA

December 24, 2014

 

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.

Arbeo-Dellorto SHA carbs were made in Spain under license for the Spanish moped Derbi. They were more goldish colored, and tended to leak fuel past the float seat.

Generic SHA: Since the 2000’s there are China made remakes. Most have different screw threads, not Italian-metric. Many have M5-0.80 jet threads, different from Dellorto M5-0.75. The Runtong remake carb has M5-0.75 jet threads. So it can take any Dellorto M5 jet, but many other generics cannot.

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

Originals          choke  approx. clamp  xxx   fits on
  ID #   size       type xxyears    size  sleeve intake  stock jets  applications

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

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

 


Replacement Carburetors

SHA 14/12L lever choke, 57 jet, air cover #39
replaces carbs that clamp to 16, 17, 18 or 19 mm intake pipes
$73.0 with 21 x 16 sleeve  some SHA 14/9, 14/12 
$73.0 with 21 x 17 sleeve  
$70.0 with 21 x 18 sleeve  14/12P, Arbeo 12/12, some SHA 14/9, 14/12
$73.0 with 21 x 19 sleeve

 

SHA 14/12R cable choke, 54 jet 
N/A has 19 mm clamp  replaces Gurtner Motobecane side-mount

 

 

 

SHA 15/15L lever choke, 68 jet, air cover #39
replaces carbs that clamp to 16, 17, 18 or 19 mm intake pipes
N/A with 21 x 16 sleeve  
N/A with 21 x 17 sleeve  
N/A with 21 x 18 sleeve  14/12P, Arbeo 12/12, some SHA 14/12
N/A with 21 x 19 sleeve

 

SHA 15/15C cable choke, 70 jet, air cover #39
replaces carbs that clamp to 16, 17, 18 or 19 mm intake pipes
$73 with 21 x 16 sleeve  
$73 with 21 x 17 sleeve  
$73 with 21 x 18 sleeve  Arbeo 12/12C 
$70 with 21 x 19 sleeve

 

 

 

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 are for redirecting the throttle cable. Pipe thread is M6-0.75. Adjuster thread 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

price colors mean used  new  new
part# colors mean old Dellorto, Dellorto, Minarelli, Garelli, Tomos, other

pic#   part#   price      description           specification


Although some pipes are shown with adjusters, bare cable pipes do not include #3a pipe adjuster and #3 pipe lock nut.

1     1476-06  rubber boot long
1
a 
  1476A $2.00 rubber boot short 219624
2     1104-37 $5.00 carb top adjuster with nut A13 M6-0.75
2a   7423-35 $13.0 cable pipe bare Vespa x  22×30 90º use 2ar
2ar 7423-re $6.00 cable pipe bare Vespa xx 22×30 90º 
2b   3698-35 N/A    cable pipe bare  6560 xx 20×28 90º use 2br
2br 3698- re $16.0 cable pipe bare Min 656  20×30 90º

2c   3600-35 $13.0 cable pipe bare  6680 xx long 70º use 2cr
2cr   243152 $8.00 cable pipe bare Tom A55 long 70º 

2d   0pipe2d $7.00 cable pipe bare Derbi  xx long 70º no adj.
280210400$7.00 cable pipe bare Garelli x  medium 35º 
2f 163515835$15.0 cable pipe bare Gar. VIP  short 45º
2g   0 pipe2g $5.00 cable pipe bare xx xxxxx 30×27 90º 
2h    219623 $5.00 cable pipe bare Tom A35 med. 70º 
2j     0pipe2j $5.00 cable pipe bare xxxxxx   med. 32º 
2k   0010854
N/A    cable pipe bare xxxxxx   long 50º 
2n    0pipe2n N/A    cable pipe bare xxxxxx   long 40º

2as  53036 $9.00 cable pipe set xxxxxxx  1+2ar+3a
2cs  53037 $14.0
cable pipe set xxxxxxxx 1+2h+2cr+3a
2ks  53038 N/A
     cable pipe set xxxxxxx  1 +2k+3a 
2js  0 53073 N/A
     cable pipe set xxxxxxx 1a+2j+3a  
2
gs    53040 $9.00 cable pipe set 11630cu 1+2g+3a 
2fs   265146 N/A
    cable pipe set Malossi  1a+2fr     
2ns  53058 N/A
     cable pipe set xxxxxxx 2n+3b      
3     1691-27 $3.00 cable pipe lock nut M6-0.75  special

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

3a    219625 $6.00 pipe adjuster with nut M5-0.75 not M5-0.8
3b   1692-27 $3.00 pipe adjuster lock nut M5-0.75 not M5-0.8
4
     3318-36 $2.00 top screw M4-0.75 x 14 slot not M4-0.7
5     5011-23 $1.50 narrow 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 $12.0 slide throttle #1 metal 219580 6590 25mph
12a 6108/2x $8.00 slide throttle #2 metal 20mph
12b 00-6108 N/A     slide throttle #12 plastic
13   4190-36 $5.00 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   6106-00 $8.00 banjo metal angled out 6530 3/16″

15a  219584 $9.00 banjo inlet metal straight 3/16″
15b 00-9249 $7.00 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 $2.50 nut M6 teardrop 6350 most have regular nut
18   6159-30 $3.00 gasket for air filter 6420
19   6105-00 $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 $7.00 21-18 sleeve, outer lip for 18.00 mm intakes
23e 227324 $5.00 rubber ring,  for 23d  21 x 16 x 3.5 angled
23e -227324 $5.00 only for carbs that have sleeve 23d Tomos
23f  0-10146 $7.00 21-19 sleeve, inner lip for 19.00 Peugeot, MB
23g 2300-62 $7.00 21-19 sleeve, outer lip for 19.00 Peugeot, MB

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

23j 00 19-17 $22.0 19-17 sleeve,
inner lip for Motobecane (some)
23k114482 $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   2838-05 $10.0 float needle valve L=17.0 photo
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 $7.00 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 $18.0 float all white plastic
30   612300 $2.00 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 $4.00 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 $9.00 air filter metal screen
36   7758-85 $10.0 air box small thin type 1 no tubes 40
37   8603-85 $11.0 air box large thick type 5 no tubes 41
37  
8605-85 $12    air box large thick type 3 not shown
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
39b  53051b $6.00 clip only
40   7195-35 $7.00 restrictor tube small Ø8×20
41   5309-35 $8.00 restrictor 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)

Dellorto SHA choke levers

 

 

 

 

 

 

 

 

 

Tomos Parts
51 219374 $10.0 junction sleeve replica 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 $35.0 air box assy 57, 58, 59 xxxx 96-06 A35
58 044438 $1.00 air box screw xxxxxxxxxxxxx 96-06 A35
59 229704 $7.00  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. 

 

 

 

 


Jet Drills

January 27, 2007

 

Above, a Tomos A55 idle jet (M4 thread) is physically bigger than a Puch Maxi main jet (M3.5 thread), but the hole size is much smaller. The photo shows how the #25 jet, 0.010" (ten thousandths of an inch), will allow the thinner wire of the wire wheel to pass through the hole, but not the thicker wire of the wire brush. This is a useful cleaning technique.

Above, a Tomos A55 idle jet (M4 thread) is physically bigger than a Puch Maxi main jet (M3.5 thread), but the hole size is much smaller. The photo shows how the #25 jet, 0.011″ (eleven thousandths of an inch), will allow the thinner wire of the wire wheel to pass through the hole, but not the thicker wire of the wire brush. This is a useful cleaning technique.

This will help you visualize how small these drills and jets are!

Moped main jets range from 0.018″ (#77 drill) to 0.026″ (#71 drill). 

Moped idle jets, like Tomos A55, are 0.011″ (smaller than #80).

An average human hair is 0.003″ (three thousandths of an inch).

So moped jet holes are 4 to 9 hairs wide!

Shauns well used jet drill container from the 1980's

Shaun’s well used drill container from 1987

 

Jet Drills: All through the late 1980’s and 1990’s, Shaun (at Royal Cyclery and later at Myrons Mopeds) used the USA-made jet drills to service carburetors. The drill sizes are an American wire gauge. They did not vary in size. Those 20-piece Drill Sets 61 to 80, cost $40 in 2015, $33 in 1998. and $29 in 1987. Some are in clear plastic round dome containers, and some are in conventional metal drill set boxes.

 

 

Drill Set 61-80 USA-made

Drill Set USA-made

Jet Drills made in China

Set 1 China-made

China-made Drills: In the 2000’s there were many China made tools sold in “surplus” tool stores. The China made 20-piece Drill Sets 61 to 80, sell for $7 to $10, or one fourth as much. They have an excellent blue plastic container, that only lets out one at a time. But the drill sizes are all wrong. From about 2010 to 2014, Myrons Mopeds sold these inexpensive drill sets, not knowing that the drill sizes were inexact, to say the least.

So although the China sets cost one forth as much, they only have about seven or eight different sizes, and they lack the smaller sizes below 0.4 (or sometimes 0.6) mm. Each set is different.

 

Jet Drills made in USA

Jet Drills made in USA

Set 2 China-made

Some have poorly made drills, twisted funny, bigger at the cutting end, or lumpy, varying in thickness. Some have poorly made cutting tips, so they might wander, grab and break, or not cut well.

Despite the poor quality and inexactness, the inexpensive drills are still useful for cleaning purposes, but not for measuring and maybe not for drilling. Fortunately, brass carburetor jets are the easiest thing to drill, with a drop of oil and a pilot hole already there.

 

 


Micro Drills and Wires for Sale Individually

These drills are measured at the shank (the smooth part). At the cutting edge they are 1 or 2% bigger.

These wires are steel guitar strings, cut into 5 inch lengths. 

“Metric” jets have a number that literally means hundredths of a millimeter, so a 64 jet is 0.64 mm.

Micro Drills for sale

inch   mm/#  price     moped jets that it cleans
0.011   wire     N/A Gurtner Motobecane diffuser – two idle holes (.013)
0.0135 #80  $6.00
0.0145 #79  $5.00
0.0157 0.40  $3.00 Dellorto 38 (.0162), Bing 42 (.0162)
0.016   #78  $4.00 Dellorto 40 (.0168), Bing 44 (.0167)
0.017   wire  $0.50 Dellorto 42 (.0177), Bing 46 (.0175)
0.018   #77  $3.50 Dellorto 44 (.0186), Bing 50 (.0188)
0.019   ——  $2.00 Dellorto 46 (.0194), Bing 52 (.0194)
0.0197 0.50  $2.00 Dellorto 48 (.0202), Bing 54 (.0200), “Metric” 51 (.0201)
0.0200 #76  $3.50 Dellorto 49 (.0207), Bing 56 (.0206), Gurtner 210=52 (.0210)
0.021   #75  $4.00 Dellorto 51 (.0215), Bing 58 (.0213), Gurtner 220=54 (.0220)
0.0225 #74  $5.00 Dellorto 55 (.0231), Bing 62 (.0229), Gurtner 230=56 (.0230)
0.023   ——  $2.00 Dellorto 56 (.0235), Bing 64 (.0234), Gurtner 240=58 (.0236)
0.0235 0.60  $2.00 Dellorto 58 (.0242), Bing 66 (.0239), Gurtner 245=59 (.0239)
0.0235 0.60  $1.50 Dellorto 58 (.0242), Bing 66 (.0239), Gurtner 250=60 (.0242)
0.024   #73  $3.00 Dellorto 60 (.0247), Bing 68 (.0248), “Metric” 63 (.0248)
0.025   #72  $3.50 Dellorto 62 (.0255), Bing 70 (.0254), “Metric” 65 (.0256)
0.026   #71  $4.50 Dellorto 66 (.0268), Bing 74 (.0267), “Metric” 68 (.0268)
0.0275 0.70 x N/A  Dellorto 70 (.0280), Bing 78 (.0280), “Metric” 71 (.0280)
0.028   #70  $4.00 Dellorto 72 (.0287), Bing 80 (.0287), “Metric” 73 (.0287)
0.0292 #69  $4.50 Dellorto 78 (.0306), Bing 84 (.0301), “Metric” 77 (.0303)
0.030   wire     N/A Dellorto 80 (.0312), “Metric” 79 (.0311), Gurtner K80 (.0311)
0.031   #68  $4.50 Dellorto 82 (.0318), “Metric” 81 (.0319)
0.0315 0.80  $2.00 Dellorto 84 (.0324), “Metric” 82 (.0323)
0.032   #67  $3.00 Dellorto 86 (.0331), “Metric” 84 (.0331)
0.0325  —— $2.00 Dellorto 88 (.0337), “Metric” 86 (.0339)
0.033   #66  $4.50 Dellorto 90 (.0343), “Metric” 88 (.0346)
0.034   wire     N/A “Metric” 90 (.0354)
0.035   #65  $3.00 “Metric” 92 (.0362), Gurtner MB (side mount) diffuser (.0358)
0.0354 0.90  $2.00 “Metric” 94 (.0370)
0.036   #64  $3.00
0.037   #63  $2.50
0.038   #62  $1.50
0.039   #61  $1.50
0.0394 1.00  $1.00

 


Deluxe 40-piece Micro Drill Set

Jet Drills 80-72 and 71-60

Myron’s Mopeds two case deluxe micro drill set, 80 to 72 (small) and 71 to 60 (large) plus many in-between sizes.
Price $45

Slide clear top plastic until hole is over drill (and pointer is on desired drill number). Only lets one drill out at a time. Never take out more than one at a time, or they can get mixed. The case keeps them organized. If any get lost, dull, or broken, individual drills can be bought at some hardware stores for $3-$4 each.

Useful for sizing to tell how big a jet really is (sometimes they’re drilled out or labeled wrong).

Useful for cleaning varnish or corrosion coating the inside of an old jet. It doesn’t really clean out any other way. The drill is used as a file, held with a needlenose pliers.

Useful for drilling jets to make a new size, as an alternative to buying ones. The drill is held with a needlenose pliers, and the jet is rotated with your fingers, with a drop of oil. To go down in size, fill the hole with solder and re-drill it smaller.

 

 

 

Here is a pin vise, a mini drill chuck, price $8

 

 

 

 

 

 

 


Other Tools for Cleaning Jets

Using a micrometer to measure a 0.017 wire

Using a micrometer to measure a 0.017″ wire

Guitar steel string 17 thousandths of an inch

Guitar string

Guitar Steel Strings in the smaller sizes are excellent tools for cleaning small holes. Here is a 0.0170 inch steel wire guitar string, perfect for cleaning out a 1974-85 Tomos stock jet size 46 that has a 0.0175 inch hole. A Honda Express NC50 (Keihin) carburetor, has a long brass idle jet tube with a tiny jet hole at the far end, too far for a drill to reach. For that, only a 2 or 3 inch piece of 0.010″ steel guitar string will reach to clean it. Ultrasonic cleaners, carb spray, or soaking are not effective for that. Other examples are a Sachs 52 jet 0.0190 would be cleaned by a 0.018″ wire, or a Motobecane 230 jet 0.023″ would be cleaned by a 0.022″ wire. The wire has to be a little smaller than the hole. Plain steel strings range from 0.008″  to 0.017″ in steps of 0.001″. Wound strings range from 0.017″ to 0.065″. 

 

Torch Tip Cleaner Set

Torch Tip Cleaner Set

Root Canal Files

Root Canal Files (say ahhh)

Welding Torch Tip Cleaners are another excellent tool for cleaning small holes. The tip has a cutting surface but not the sides. So it is made to clean the hole without widening it.

Wire Feeler Gauge Sets: There are also wire gauge measuring sets that look the same as the torch cleaner set shown.

Dentist’s Root Canal Files are also good for cleaning small holes. Color coded files range from 0.06 to 1.10 mm (0.0024 to 0.0433 inch).