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Laura Engines

July 27, 2014

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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 Daelim Motor Corp. for the brand known as Trac (made by Kia) in the US. The M56 remake was on 1982-86 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. 1978-86 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  link engine cover
3.  540292 4    $5 rubber tab
4.  820502 2  50¢ hex bolt M5x15
5.  84350010¢ lock washer M5
6.  480981 1  $15 support plate
7.  480980 1  $22 start lever
8.  827500 6  25¢ hex nut M5
9.  843500 6  10¢ 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  $35 friction plate
15 480683 1  N/A exhaust gasket
16 828010 1   $4 hex nut M10-1.0×6
17 840010 1   $8 tab washer M10
18 480886 1  $25 weight-spring ring
19 810081 2  link ball bearing 15x35x11
20 820520 6   $6 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 $22 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 $90 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$15 base gasket
36 829680 4  link cylinder stud M6 x 115
37 847600 4  20¢ plain washer M6
38 84660020¢ lock washer M6
39 827600 4  50¢ 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  20¢ plain washer M10
44 828000 1  50¢ tooth washer M10
45 828000  $2 nut M10-1.0×10
46 816181 1  link oil seal 14x30x7
47 823506 6  50¢ case screw M6 x 25?
51 820603 1   50¢ hex bolt M5x??
52 843600 1  20¢ lock washer M5
53 481784 2  N/A inlet gasket
54 481783$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 $25 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   $3 spark plug NGK B5HS
70 480185 1  N/A grommet for wires
71 480894 1  N/A housing-thin-pulley (20)
71 480880150 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$25 intake pipe (25 & 30) Ø11
74 481594 1  N/A pulley with 11T (20mph)
74 481598$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   $8 clutch washer (25,30) 12x24x0.5
00 480899a    $5 clutch washer thicker 12x24x0.8

 


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.

 First the felt ring #23 goes into a recess in the housing-pulley #71. Then the large 15mm washer #41 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 #79 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 #79 and #22. When the engine is running, but the rear wheel is stopped, #79 spins, but #41 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 xx Price
 xx  number  no.  qty xxx  Description
===============================
001 827600 04060 4 30¢ nut M6
002 846600 06060 4 20¢ lock washer M6
003 847600 05060 4 20¢ washer M6
004 829682 10025 4 $$2 cylinder stud M6x107
005 481883 80015 1 $$3 spark plug NGK B6HS
006 540681 80001 1 N.A. cylinder head (20 & 25)
006 540695 80010 1 $40 cylinder head (30 mph)
007 560688 none   1 N.A. cylinder (20 mph)
007 540680 80003 1 N.A. cylinder (25 mph)
007 560685 8000? 1 N.A. cylinder (30 mph “50 km”)
008 490682 80029 1 $$6 cylinder base gasket
009 540580 80016 1  link piston Ø40×18-12-14
010 561895 82013 1  link plug wire boot
011 480502 80021 2  link piston ring Ø40 x 1.5 FG
012 480501 80022 1  link piston pin Ø12 x 33
013 841520 80023 2  link piston pin clip Ø12
014 480325 80024 1 $15 piston bushing Ø12x14x11
015 560381 80025 1 $100-150 crankshaft
016 810080 10034 2  link bearing 6202
017 830000 80026 1  link clutch hub key 3 x 5 M-86
018 830001 80027 1  link flywheel key 2 x 3.7 M-81
019 540882 81001 1 $20-30 clutch saucer
020 560395 81002 1 $$1 wave washer 15x24x1
021 490390 81003 1 $7-11 disk nut M15-1.0
022 540886 81004 1 $25-40 weight-spring
023 540803 81005 1 $15-25 clutch hub
024 540898 81006 1 $10-20 metal plate
025 480889 81007 1 $35-50 clutch plate
026 540899 81008 1 $5 – 8 star spring
027 480890 81009 1 $7 –12 outer locking plate
028 820509 81010 6 50¢ hex bolt M5x20
029 540809 81011 1 $$5 friction lining ring
030 560890 810?? 1 $50-80 clutch housing
031 813090 81013 2 $12 needle bearing 12x15x10
031 813090100000 1 N.A.inner, 2 ends open HK1210

032 490813 none   * N.A. shim as needed 12x24x0.8
032 490814 81014 1 $$4  shim as needed 12x24x0.5
032 490814 81014 1 $$4  same as M48 one 480899

033 841505 81015 1 $$1 circlip Ø10.9 12.0 shaft
034 560892 81016 1 $35 thrust saucer, new button
035 480892 81018 1 $$8 leaf spring
036 829605 80047 1 $$5 starter stud M6 x 55
037 490293 81019 1 $$5 cover support plate
038 561096 none   1 $15 sprocket 13T (20 mph)
038 561097 81037 1 $15 sprocket 17T (25 & 30)
039 490886 81020 1 $$6 starter mount spring
040 490980 81021 1 $12 starter arm lever
041 827610 04060 2 30¢ nut for starter M6
042 836103 81012 3 N.A. rivet for lining ring 3×6
043 843500 06050 6 $$1 wave washer M5 thin
044 490835 none   1 $$6 starter cable spring
045 813088 81028 1 $15 needle bearing 12x15x10
045 813088 00000 1 N.A.inner, 1 end open BK1210
046 560883 81023 1 $20 clutch hub Ø21 at seal
047 561385 none   1 N.A. pulley shaft Batavus Ø15
T47 none     81030 1 $45 pulley shaft Trac Ø12
048 561590 none   1 $50 62T pulley Ø15 center
T48 none     81026 1 $30 62T pulley Ø12 center
049 830004 81031 1  link shaft key 3 x 6.5 M-88
050 560891 81025 1 N.A. toothed belt (special)
051 810182 10028 1 $$8 bearing 17x40x12 6302
052 490813 81029 2 $$4 pulley shaft shim 12x24x 0.8
052 490813 81029 2 $$4 same as M48 one 480899a

054 840011 81038 1 $$5 tab washer Ø17 x 32
055 828200 81039 1 N.A. sprocket nut M12-1.25
056 561098 none   1 N.A. drive shaft Batavus
T56 none     81033 1 N.A. drive shaft Trac
057 541685 80030 1 $15 exhaust clamp
058 846600 06060 1 20¢ lock washer M6
059 820635 25614 1 40¢ hex bolt M6x25
063 491088 none   1 $$5 shim washer 10 x 24 x 0.8
T63 none      81034 1 N.A. shim washer 17 x 24 x 0.8
T63 491088 81034 1 $$5  substitute 17 x 24 x 1.0

065 561082 none   1 N.A. ratchet wheel M20-1.0
T65 none     81036 1 $45 ratchet wheel M20-1.0
067 491086 81035 1 $$8 shim 20 x 31
069 816282 81044 1  link drive shaft R seal 20x26x4
070 491087 81041 1 N.A. plate
071 561092 81040 1 $25 pedal sprocket 12T M20-1.0
075 561789 80031 1 $$7 air box front bracket
076 490181 80032 1 $$7 case gasket
077 490189 80033 2 $$5 centering bush Ø8×12
078 490186 10017 1 $$5 oil fill and check plug
079 560185 80034 1 N.A. grommet for magneto wires
080 823505 80048 8 $$1 case screw slot M5x35
081 816187 81042 1  link left crank seal 15x32x7
082 816384 81043 1  link right crank seal 21x32x7
083 816186 81045 1  link pulley shaft seal 15x30x5
084 816284 81046 1  link drive shaft L seal 17x35x7
085 820675 80045 1 $$1 carb hex bolt M6 x 75
086 829606 80047 1 $$6 carb stud  M6 x 50
087 491784 80035 1 $10 reed valve gasket square
088 481783 80036 1 $38 reed valve 4-petal
089 829510 80046 1 $$6 R cover stud M5 x 75
090 820501 00512 1 40¢ hex bolt M5 x 12
091 847520 05050 1 20¢ plain washer M5
092 560292 80037 1 $$7 left cover bracket
093 561885 82000 1  link magneto 0212-010-004
095 481890 82015 1 $$6 spark plug cap
116 561782 82500 1  link carburetor H12 (25,30)
116 561787 none   1  N.A. carburetor H8 (20 mph)
140 491797 82522 1 $$7 reed valve gasket round
141 491796 82523 1 $23 insulator block (not shown)
142 491795 80038 1 $$1 fiber washer M6
143 843600 05060 1 20¢ plain washer M6
148 560213 80042 1  link left cover (magneto)
149 560210 80041 1  link right cover (clutch)
150 560291 80044 1  link slot step-cap nut rear M5
151 560290 80043 2  link slot step-cap nut front M6
153 823435 80049 2  link pan phillips screw M4x35
154 491387 none   1 $13 stepped ring 15 x 24 x 4.6
155 491386 none   1   $2 wire clip Ø15 shaft x 1
156 848015 none   1   $2 washer 15.3 x 27.7 x 2.4
157 848012 05100 1 50¢ washer M10
158 847000 06100 1 50¢ lock washer M10
159 828000 81027 1 $$2 nut M10-1.0
165 561388 none   1 $$7 washer 15.5×23.8×1.0
T165 none   81032 1 $$8 saucer spring 12.2×22.8×1
T165 00000 81032 1 $$5 substitute 12.2×24.8×0.9
166 823512 80050 1 70¢ wide pan slot screw M5x12
169 540692 80028 1 $$9 head gasket
175 561788 80039 1 $$9 air filter bracket
189 560194 none   1 N.A. L & R engine case (20 mph)
189 560180 80040 1 N.A. L & R engine case (25, 30)
194 820308 81017 2 $$1 phillips screw M3x10
195 810080 10034 1  link bearing 15x35x11 6202

 

 


5. M56 Parts Information

More to come…

 


6. M56 Tools

More to come…

 

 

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