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| Engine Manufacturer: |
Weslake (England) |
| Engine Model: |
Mk. 5 |
| Cylinders: |
1 |
| Cubic Capacity: |
499cc |
| Bore and Stroke: |
86mm x 86mm |
| Configuration: |
Pushrod 4Valve |
| Fuel: |
Methanol |
| Compression Ratio: |
14:1 |
| Max RPM: |
9,500 |
| Horsepower: |
70-75 BHP |
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| Frame Manufacturer: |
Antig (England) |
| Front Suspension: |
Leading link |
| Rear Suspension: |
None |
| Transmission (gears): |
None |
| Brakes: |
None |
| Front Wheel: |
23" |
| Rear Wheel: |
19" |
| Clutch: |
4 Plate Dry |
| Weight Incl Motor: |
185 lbs |
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| The Weslake motor was the most successful speedway powerplant from the mid-seventies to the early eighties. My example pictured is a Mk5 which dates it around 1980. |
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| All speedway bikes are basically the same. The rules restrict the cubic capacity to 500cc with a carb no larger than a 34mm bore. We use very high compression motors which run on methanol, an alcohol fuel. This enables a motor which will have the necessary torque to get it off the start line and the very high revs required to propel the machine to high speeds, all with no gears. Simply drop the clutch and go! We change the gearing of the bike to suit different track sizes and conditions by changing the sizes of both the engine and rear wheel sprockets. Oh, and one more thing, speedway bikes have NO BRAKES! |
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