Track Racing Machine

Parts Catalog 500 cc Mk IV

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W E S L A K E

500 cc Single Cylinder

4 Valve Engine

for Alcohol based fuels

SPECIFIKATION

Cylinder bore 85.67 mm (min)

Crankshaft stroke 85.83 mm

Swept volume 494.78 cc

(Rebores up to + .38 mm will remain below 500 cc)

Compression ratio by half a ratio, a plate of 0.31 mm thickness may by fitted

under the Cylinder barrel.

Cylinder head retaining nuts 22 lb/ft torque

Timing gear retaining nut 22 lb/ft torque

Tappet clearance .006“ inlet 0.15 mm cold

.006“ exhaust 0.15 mm cold

DO NOT OVERTIGHTEN ADJUSTING SCREW LOCK NUTS.

Valve spring fitted lenght Spring solid lenght +

valve lift + 0.030“ minimum

Piston to bore clearance .007“ 0.18 mm

Crankshaft and float .020“/.040“ 0.51/1.02 mm

Contact breaker gap .015“ 0.38 mm

Ignition timing 32° - 35° BTDC vull advance

Spark Plug Champion G56R (or G59R)

Carburettor AMAL Concentric MK2 36 mm

Recommended build Main jet 580 – 600

Needle 2E3

Needle jet 120 A

Slide No. 4

Exhaust Pipe 1 – 7/8“ outside diameter

Valve timing inlet peak at 94° ATDC.

Approx. Opening 60° - 62° close 78° - 80°

For 83/102 and 85/102 Camshafts,

use 100° - 102° inlet valve peak

and .004“ inlet tappet clearance. =0.1 mm

As our policy is one of continuons development and improvement,

the Company reserves the right to change this specifikation at any time.

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A2

A3

A4

A5

A6

A7

AB

A9

A1O

All

A12

A13

A17

A18

A19

A21

A22

A23

A24

A25

A26

A28

A29

A30

A31

A32

A35

A36

A40

A41

A42

A43

A44

A45

A46

A50

A55

A65

A66

A68

A69

A70

A73

A74

A75

A78

A82

A83

A85

Valve Guldes Inlet

Valve Gulde Exhaust

Valve Seat Insert - Inlet (Part M/C)

Valve Scat Insert - Exhaust (Part M/C)

Valve Inlet - 1.5/16" Dia

Valve Exhaust - Std.

Valve Spring

Valve Spring Cap.

Valve Spring Scat

Valve Spring Shim .017

Valve Collets

Valve Circlip

Stud - Rocker Bearing Cap.

Stud Exhaust Flange

Stud Inlet Flange

Rocker Bearing Cap.

Rocker Bearing Cap

Thrust Bearing Top

Thrust Bearing Lower.

Plain Bearing Top

PIain Bearing Lower

Rocker Inlet

Rocker Exhaust

Ball End - Rocker

Tappet Adjusting Screw

Locknut - y;' UNF.

Cylinder Barrel - With Liner

Cylinder - Liner

Joint - Inlet Flange

Gasket -Copper Cylinder Head

Gasket - Shim Barrel / Head .015

Gasket - Shim Barrel/Crankcase - .01511

joint Barrel To Crankcase

Gasket - Exhaust Pipe

joint - Rocker Cover

Carburetor Manifold - Curved 38mm

Assume All Short None Std.

Rocker Cover

Clamp - Exhaust Pipe.

Nut - Cylinder Head

Nut- 5/16" UNF

Nut - y," UNF Nyloc

Washer - '/4" Flat

Washer 5/16" Flat.

Washer - Cylinder Head

Capr Heads - Rocker Cover

Oil Feed Pipe - Rockers - Complete Assembly

Right Union

Union '4" - 1/8" BSP Head

A86

A88

A89

A90

A99

A1O0

Washer 1/8" BSP.

Push Rod Tube

Elastic Band

Spark Plug

Insert Cylinder Head - Long Track

Pin - Insert Locking

Group A : - Cylinder Head / Barrel

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Group B : Kurbelgehäuse /Zündungsdeckel

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Bl Crank case - drive side

B2 Crankcase - timing side

B9 lgnition Cover

811 Sump plate

B12 Blanking plate -timing hole

B12 Blanking plate-timing hole.

B16 Tappet block-alloy

B17 Tappet bbck-alloy - + .002.

B18 Tappet block-ahoy - + .004.

B21 Std. Main bearing housing - drive side

B22 .002 Main bearing housing - O / size

B23 .005 Main bearing housing - 1 size

B23 005 Universal bearing housing o/size for DS & TS

B25 Steel thrust spacer - timing side for S66B.

B26 Al. Seal housing spacer drive side for S66B

B26 Al. Spacer - timing side

B27 Cage - Needle Roller bearing assembly for S66B

B27 Main bearings WJ 162116 needle roher bearings

B28 Bearing idler + lower sprocket

B28 Bearing camshaft - 5/8"

B29 Bearing idler shaft - '/2".

B32 Gasket - blanking plate

B34 Gasket oli pump to timing cover

B35 Joint - |gnlt|on Cover to Timing Cover

B38 Seal - drive side

B39 Oli seal

B41 'O' Ring tappet block

B42 Grommet lgnition Cam.

B43 Dowel - tappet block retainer

B44 Dowel short Timing side.

B45 Dowellong Timing side.

B46 Dowel - crankcase locating

B50 Stud - cylinder head

B51 Bolt long, - Crankcase

B52 Bolt short - Crankcase

B53 Cap Head - Oil Pump - Long

B54 '4" UNC cap head - retain ignition cover

B54 Cap head - 1" x 'G' UNC - front cahin cover barrel etc-

B55 Cap heads - '/4" UNC x W'

B56 Socket head screws - blanking plate.

B59 Nut for S73/177.

B61 Washer for S73/177.

B63 Shim oli drain valve

B64 Grill oli drain valve

B67 Oil pump - complete assembly

B69 Stud tie rod cylinder head

B70 Insert - stud adapter in crankcase

Group B Crankcase / Timing Cover / Oil

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Group C : Kurbelwelle / Kolben / Zündung

CI

C5

C6

CB

C9

C15

C16

C17

C19

C20

C21

C22

C23

C24

C26

C27

C28

C29

C31

C36

C37

C38

C39

C41

C42

C46

C54

C55

C57

C58

C59

C60

C61

C62

C63

C64

C67

C68

C69

C72

C76

C77

C79

C81

C82

C83

C85

C86

C91

Crankshaft Disc - Balanced for Steel Rod

Drive shaft

.010 Drive shaft o/size S66B.

Timing Side Shaft

Timing Side Shaft

Crankpin

010 Crank pin - o/size steel Con Rod

.020 Crank pin - o/size Steel Con Rod.

Cage - Big end

Rollers 6mm x 6mm. Steel Rod

Rollers 6mm x 8mm. Steel Rod.

Big end bearing liner

015 Big end bearing hner O / size Steel Rod

Small end bush.

Con Rod assembly

Std. Piston high compression

Std Piston High Compression.

Std. Piston High Compression

Piston - Long track

Ring - Std. Piston .040 wide

Ring - + .005 - .040 wide

Ring - .010 - .040 wide

Ring - .015 - 040 wide

Gudgeon Pin.

Circlip

Gear ldler Mk.2.

ldler Shaft Mk.2.

Body cam follower - assembly

Cam follower rollers

Pin cam follower

Shim cup cam follower body - .050

Shim cup cam follower body - .070.

Shim cup cam follower body - 090.

CUP cam follower body

Push Rod Complete Assembly

Cup end Push Rod.

Points - contact breaker

Stator Plate

lgnition Cam.

Sprocket carrier

Circlip - Sprocket carrier

Circlip - Nut drive side

Disc Spring - Timing Side Shaft

do do - 1/8" X W'

Woodruff Key for d.s. Shaft.

Cap Head - lgnition Cam Retainer

Cap Head - Stator Plate/Timing Cover.S.617

Washer 10 - 24 UNC.

Screw Point/Stator Plate

Group C : Flywheel / Piston /Timing Gear

Created by

Weslake Ölpumpe

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