Laura Engines

July 27, 2014

Laura header

M48 Engine

M48 Engine

 

Welcome. Laura engines are made in Holland (now The Netherlands).

 

 

M48  The Laura M48 is used on 1976-80 Batavus and ROG mopeds in the US. In Europe and Canada the M48 is also on Solo, and early 1971-73 Tomos, and others.

M56 engine

M56 engine

M54  In Europe and Canada, the 1973-77 Laura M54 is on Solex Tenor and others. The Laura M54 is basically an M56 top end (piston, cylinder, and head) on an M48 bottom end.

M56  The Laura M56 is used on 1978-80 Batavus mopeds in the US, and others in Europe. After 1980 it was re-made in Korea by Dailim Motor Corp. for the brand known as Trac (made by Kia) in the US. The M56 remake was on 1982-85 Trac Clipper, Eagle, and Hawk models. The M56 remake engine is 99% the same.

Contents:

1. 1976-80 Laura M48 Parts for Sale  2. M48 Information   3. M48 Tools

4. 1978-85 Laura M56 Parts for Sale   5. M56 Information   6. M56 Tools

——————————————————————————————————–

7. 1972-75 Laura M48 Parts List for Info   8. 1972 Laura M48 Service Manual  

 

More info about Laura 20, 25, 30 mph speed versions is in the Moped Brands / Holland / Batavus section.

 


Batavus VA and HS50 (M48) Parts

Batavus (M48)

1. Parts for Laura M48 Engine

The parts list below is made from all three versions (20, 25, 30 mph) of the book at right. For the M48 models, Batavus dealers were given parts books only for their state’s speed version, and not other state’s. So a dealer in 25mph state like Arizona did not know, and could not easily find out, what parts were different in a 30mph state like California. There were just a few pages that were different.

Parts for sale have a price. Green is new, dark green is used. N/A means not available. Many parts are not for sale here, but might be for sale elsewhere. Those item’s prices have a link to click on to get to them. Common things like nuts, bolts, washers, clips, pins, keys, studs, belts, chains, engine hardware, pistons, piston rings, spark plugs, belts, all are listed in their “Parts for Sale by Type” section. Remember the sizes or descriptions given here, when you go there. For example, “nut M10-1.0” has a link to “Engine Hardware” section where you would scroll down to “Engine Nuts” to find that size, 10mm, thread, 1.0mm, height 10mm, and style, regular.

#   part# qty price  description

Batavus M48 Engine 1976 exploded view1.  480201 2  link Batavus decal
2.  480200 2  N/A engine cover
3.  540292 4  N/A rubber tab
4.  820502 2  link hex bolt M5x15
5.  843500 4  link lock washer M5
6.  480981 1  $15 support plate
7.  480980 1  N/A start lever
8.  827500 6  link hex nut M5
9.  843500 6  link lock washer M5
10 480890 1  $12 locking plate
11 480882 1  $60 end plate w/button
12 480824 1  N/A start button
13 480883 1   $8 start spring
14 480889 1  $70 friction plate
15 480683 1  N/A exhaust gasket
16 828010 1  link hex nut M10-1.0×10
17 840010 1  $12 tab washer M10
18 480886 1  $25 weight-spring ring
19 810081 2  link ball bearing 15x35x11
20 820520 6 $15 splined bolt M5x27
21 480881 1  N/A clutch hub
22 480887 1   $8 saucer spring  12x28x1.0
23 816180 1  N/A felt oil ring  15x20x3
24 813081 1 $30 needle bearing 15x21x22
25 816480 1  link oil seal 20x42x7 offset
26 841512 1  N/A crank circlip
27 838045 2  N/A dowel roll pin Ø5×12
28 480181 1  N/A case gasket
29 480381 1 100 crankshaft
30 480325 1 $12 piston bushing Ø11.6x14x11
31 841520 2  link piston pin clip Ø12
32 480501 1  link piston pin Ø12 x 33
33 480580 1  link piston assy Ø40×18-12-14
34 480502 2  link piston ring Ø40 x 1.5 FG
35 480682 1 $15 base gasket
36 829680 4  link cylinder stud M6 x 110
37 847600 4  link plain washer M6
38 846600 4  link lock washer M6
39 827600 4  link hex nut M6 x 6
40 481890 1  link spark plug cap
41 490814 1   $8 clutch washer 15x28x0.5
42 830000 1  link flywheel key 3 x 5mm
43 848011 1  link plain washer M10
44 828000 1  link tooth washer M10
45 828000 1  link nut M10-1.0×10
46 816181 1  link oil seal 14x30x7
47 823506 6  link case screw M6 x 25?
51 820603 1  link hex bolt M5x??
52 843600 1  link lock washer M5
53 481784 2  N/A inlet gasket
54 481783 1 $25 reed valve 4-petal
55 813086 2  N/A needle bearing Ø16
56 481591 1  N/A pulley dust cover
58 481786 1  N/A dirt splash shield
59 481797 2  N/A step washer M5
60 820500 2  link hex bolt M5
61 480892 1   $8 clutch leaf spring
63 540898 1 $35 pressure plate
64 485194 1  N/A crankcase (20mph)
64 485180 1  N/A crankcase (25 & 30)
65 480695 1  N/A cylinder head (20 & 25)
65 485695 1  N/A cylinder head (30mph)
66 485697 1  N/A cylinder (20mph)
66 485690 1  N/A cylinder (25 & 30)
67 481883 1  link spark plug NGK B5HS
70 000000 1  N/A grommet for wires
71 480894 1  N/A housing-thin-pulley (20)
71 480880 1 150 housing-pulley (25 & 30)
72 486795 1  link  carb. assy 8mm (20mph)
72 481790 1  link  carb assy 8mm (25mph)

72 541780 1  link  carb assy 12mm(30mph)
73 481794 1  N/A intake pipe (20mph) Ø6
73 481785 1 $25 intake pipe (25 & 30) Ø11
74 481594 1  N/A pulley with 11T (20mph)
74 481598 1 $70 pulley with 13T (25 & 30)
75 480893 1  link  v-belt thin long(20mph)
75 480891 1  link  v-belt thick (25 & 30)
76 481091 1  N/A sprocket 11T (20mph)
76 481093 1  N/A sprocket 13T (25 & 30)
77 481506 1  N/A tab nut (20mph)
77 481505 1  N/A tab nut (25 & 30)
79 480899 1  N/A clutch washer (25,30) 12x24x0.5

 


Batavus M48 Clutch Small Parts

Batavus M48 Clutch Small Parts

2. M48 Engine Parts Information

Small clutch parts: Most of the small clutch parts are in this photo.

Top row, #17 840010 tab washer, #4 820502 hex bolt, #5 843500 washer, #6 480981 plate, #61 480892 leaf spring, #22 480887 saucer spring (used), #20 820520 splined bolt.

Bottom row, #24 813081 needle bearing, #23 816180 felt ring, #41 490814 washer, #22 480887 saucer spring, #79 480899 washer.

Saucer spring: You can see the shiny rings on the used saucer spring. They are where the contact was. The dark areas never touch anything. 

Leaf spring: The leaf spring goes on any one of the ten tabs of the friction plate, under the basket. What it does is reduce vibration. It stops the jingle bells sound, and helps the friction plate tabs last longer. It is not essential, but very beneficial. 

Crank Seals: Laura M48 uses crank seals that are 1 mm smaller (tighter) than normal.  The 15mm right side has a 14x30x7 seal. The 21mm needle bearing case on the left side has a 20x42x7 special seal with an offset lip. 

 

Friction Plate #480889: 10 tabs, each 10.5mm wide, inner diameter 58.5mm, outer diameter 92.4mm (100.4mm at tabs), thickness 3.65mm.

Note: The tabs break off when the slots in the basket become worn or notched on one side. This is because not all ten tabs are sharing the load evenly. A worn clutch housing/basket also makes the clutch stick and not go into “neutral”.  

 

 

Clutch Housing with Pulley #480880: 10 tabs, 10.3mm wide, ID 94.0mm, OD 98.6mm, center needle bearing ID 15.0mm, OD 21.0mm, length 22.0. Comes with the needle bearing only. Price $150 new, $100 almost new not worn. Far left, a new one and a worn out one. The slots for the tabs get worn wider where the plate tabs push at. Filing those flat will help, but it might still stick sometimes.

 

 

Clutch Housing Versions

480880 and 480894

480880 red has wide pulley for
US 25,30mph, Euro 40,45,50kmh
480894 yellow has thin pulley
US 20 mph, Euro 25,30 km/h

480880 clutch housing with pulley

480880 clutch housing
25.5 mm deep at crank

480894 clutch housing with thin pulley

480894 clutch housing
24.4 mm deep at crank

 

 

 

 

 

 

 

 

 

 

 

Clutch Washers: The Batavus crank goes from 12mm to 15mm right at the edge of the needle bearing. The clutch needle bearing is lubed by the gasoline and oil mist in the crankcase. The three special steel washers, one cupped, seal the crankcase pressure on the spinning crankshaft, along with the rubber crank seals.

 Batavus clutch housing with special washersFirst the felt ring #23 goes into a recess in the housing-pulley #71. Then the large 15mm washer #79 goes on, just over the 12-15 step in the crankshaft. Then the 12mm saucer spring #22 goes on with the dish side up (outward). Then on 25 and 30 mph versions with the brick red pulley, the 12mm small washer #41 goes on, into the dish of the saucer spring. Then the aluminum clutch hub with large steel saucer in back goes onto the flat sided part of the crank, and rests against the #41. When the outer nut is tightened, the saucer spring is compressed slightly, so that the crankcase is sealed by the metal-to-metal contact ring between #41 and #22. When the engine is running, but the rear wheel is stopped, #41 spins, but #79 is stationary. Once the bike gets over 10mph, #41 and #79 are both spinning in sync, so the metal-to-metal pressure seal gets better.

 

Crankcase Pressure Leaks: All of this special washer business allows the needle bearing to never need greasing. But if a washer is missing, there is a small pressure leak. A small crankcase pressure leak causes a small loss of engine power at low speeds.

On a two-stroke crankcase the leak alternates in both directions. Piston going down causes some fuel mist to get pushed out. Piston going up causes some fresh air to get sucked in. Then the cycle repeats. Because of the rapid reversal of direction, at low engine speeds the leak has more time to happen, due to inertia. So the effect of leaving out one of the washers is to cause less “low-end torque”. The engine is weak until it gets going fast, then it is normal but lean.  

There is a small grease seal in the needle bearing #24. But it is not a pressure seal with a ring spring. So it is sealed partially, even without the washers. That is why leaving out the washers only causes a small loss of low speed power.

 

Engine Covers:

Motobecane magneto cover

1970’s Motobecane grey cover

Batavus clutch cover

1970’s Batavus black cover

Laura engine cover

1970’s Laura grey cover

 

 

 

 

 

 

 

 

 

 

Batavus M48 with late Motobecane magneto cover

1980’s Motobecane black cover

Angel

1970’s Angel grey cover

Laura M48 magneto (right) and clutch (left) covers are the same. There are different versions, including aftermarket, and different stickers.

Laura, Motobecane, Batavus, Badger, Angel, Speed Bird magneto covers all interchange, because they all have a 62 mm inner diameter. Treatland has the late Motobecane covers for the Novi magneto, for sale here: http://www.treatland.tv/motobecane-av7-novi-ignition-black-plastic-cover-p/motobecane-av7-flywheel-cover.htm

 

 

 

 


3. Tools for Laura M48 Motor

1972 Anker Laura M48 tools116 crank bearing puller
117 crank bearing driver
118 flywheel holder
119 clutch holder/puller
120 flywheel puller
121 piston bushing press
122 timing gauge
123 clutch fitting sleeve
124 adapter M10
125 crank support plate
126 oil seal driver
127 oil seal driver

 

 

 

 

 

 

 

 


4. Parts for Laura M56 Engine

Trac (M56) Parts

Trac (M56) Parts List

Batavus Regency (M56) Parts

Batavus (M56)

The parts list below is made from these two books: 

Parts for sale have a price. Green is new, dark green is used. N/A means not available. Many parts are not for sale here, but might be for sale elsewhere. Those item’s prices have a link to click on to get to them. Common things like nuts and bolts are listed in their “Parts for Sale by Type” section. Remember the sizes or descriptions given here, when you go there. For example, “nut M10-1.0” has a link to “Engine Hardware” section where you would scroll down to “Engine Nuts” to find that size, 10mm, thread, 1.0mm, height 10mm, and style, regular.

 

 #  Batavus Trac        Description
 xx  number   no.  Price
===============================
Batavus M56 exploded view001 827600 E1.15  link  nut M6
002 846600 E1.16  link   lock washer M6
003 847600 E1.17  link  washer M6
004 829682 E1.14    $7  cylinder stud M6x107
005 481883 E1.03   link  spark plug NGK B6HS
006 540681 E1.01  N/A  cylinder head (20 & 25)
006 540695 E1.01  $40 cylinder head (30 mph)
007 560688 E1.02  N/A  cylinder (20 mph)
007 540680 E1.02  N/A  cylinder (25 mph)
007 560685 E1.02  N/A  cylinder (30 mph)
008 490682 E1.19   $15  cylinder base gasket
009 540580 E1.04   link  piston Ø40×18-12-14
010 561895 E1.21   link  plug wire boot
011 480502 E1.05   link  piston ring Ø40 x 1.5 FG
012 480501 E1.06   link  piston pin Ø12 x 33
013 841520 E1.07   link piston pin clip Ø12
014 480325 E1.08  $15 piston bushing Ø12x14x11
015 560381 E1.09  100 crankshaft
016 810080 E1.10   link  bearing 6202
017 830000 E1.11   link  clutch hub key
018 830001 E1.12   link  flywheel key 2×3.7
019 540882 E2.01  N/A  clutch saucer
020 560395 E2.02  N/A  ondulated washer
021 490390 E2.03  N/A  disk nut
022 540886 E2.04  N/A  clutch spring
023 540803 E2.05  N/A  clutch hub
024 540898 E2.06  N/A  pressure plate
025 480889 E2.07  N/A  clutch plate
026 540899 E2.08  N/A  star plate
027 480890 E2.09  N/A  locking plate
028 820509 E2.10  N/A  screw
029 540809 E2.11  N/A  friction disk
030 560890 E2.12  N/A  clutch housing
031 813090 E2.13  N/A  needle bearing
032 490813 E2.14  N/A  shim 0.8  or
032 490814 E2.14  N/A  shim 0.5
033 841505 E2.15  N/A  circlip
034 560892 E2.16  N/A  thrust saucer
035 480892 E2.17  N/A  leaf spring
036 829605 E2.18  N/A  stud
037 490293 E2.19  N/A  plate
038 561096 E0.00  N/A  sprocket 13T (20 mph)
038 561097 E2.20  N/A  sprocket 17T (25 & 30)
039 490886 E2.21  N/A  spring
040 490980 E2.22  N/A  starter lever
041 827610 E2.23  N/A  nut
042 836103 E2.24  N/A  rivet
043 843500 E2.25  N/A  ondulated washer
044 490835 E2.26  N/A  spring
045 813088 E2.27  N/A  needle bearing
046 560883 E2.28  N/A  steel hub
047 561385 E2.29  N/A  driving shaft
048 561590 E2.30  N/A  tooth belt wheel
049 830004 E2.31  N/A  key
050 560891 E2.32  N/A  tooth belt
051 810182 E2.33  N/A  bearing
052 490813 E2.34  N/A  shim
054 840011 E2.35  N/A  lock washer
055 828200 E2.36  N/A  nut
056 561098 E2.37  N/A  lay shaft
057 541685 E1.22  N/A  exhaust clamp
058 846600 E1.16   link  lock washer M6
059 820635 E1.24   link  hex bolt M6x25
063 491088 E2.39  N/A  shim
065 561082 E2.40  N/A  ratchet wheel
067 491086 E2.41  N/A  shim
069 816282 E2.42   link  oil seal R drive 20x26x4
070 491087 E2.43  N/A  plate
071 561092 E2.44  N/A  chain wheel
075 561789 E1.25  N/A  air box bracket
076 490181 E1.26  N/A  case gasket
077 490189 E1.27  N/A  centring bush
078 490186 E1.28  N/A  oil fill plug
079 560185 E1.29  N/A  rubber grommet
080 823505 E1.30  N/A  screw
081 816187 E2.45   link  left crank seal 15x32x7
082 816384 E2.46   link  right crank seal 21x32x7
083 816186 E2.47   link  oil seal middle 15x30x5
084 816284 E2.48   link  oil seal L drive 17x35x7
085 820675 E1.31  N/A  screw
086 829606 E1.32  N/A  stud
087 491784 E1.33  N/A  reed valve gasket
088 481783 E1.34 $25 reed valve 4-petal
089 829510 E1.35  N/A  stud
090 820501 E1.36  N/A  screw
091 847520 E1.37  N/A  washer
092 560292 E1.38  N/A  left cover bracket
093 561885 E1.39  N/A  magneto complete
095 481890 E1-20  N/A  spark plug cap
116 561782 E4-01  N/A  carburetor H12 (25,30)
116 561787 E0-00  N/A  carburetor H8 (20 mph)
140 491797 E1-41  N/A  gasket
142 491795 E1-42  N/A  washer
143 843600 E1-16  N/A  ondulated washer
148 560213 E1-51  N/A  left cover
149 560210 E1-52  N/A  right cover
150 560291 E1-43  N/A  cap nut M5
151 560290 E1-44  N/A  cap nut M6
153 823435 E1-45  N/A  screw M4
154 491387 E1-41  N/A  spacer ring
155 491386 E0-00  N/A  lock washer
156 848015 E0-00  N/A  washer
156 000000 E2-52  N/A  saucer spring
157 848012 E2-49  N/A  washer
158 847000 E2-50  N/A  lock washer
159 828000 E2-51  N/A  nut
165 561388 E0-00  N/A  wave washer
166 823512 E1-46  N/A  screw M5
169 540692 E1-18  $15  head gasket
175 561788 E1-47  N/A  air filter bracket
189 560194 E0-00  N/A  engine case (20 mph)
189 560180 E1-49  N/A  left engine case (25,30)
189 560180 E1-48  N/A  rt. engine case (25,30)
194 820308 E2-53  N/A  phillips screw M3
195 810080 E2-54  link  bearing 6202

 

 


5. M56 Parts Information

More to come…

 


6. M56 Tools

More to come…

 

 

Find out more about the Laura Engines »