Description
The ROK VLR is the perfect engine for the entry-level driver, the ROK VLR not only offers superior performance over its rivals with lower maintenance, but it also offers some great features like electric start. All at a cost racers can afford.
- Volume of cylinder: 98.53 cc 100cc MAX
- Original bore: 48.20 mm ±0.2
- Theoretical maximum bore: 48.53 mm MAX
- Stroke: 54.00 mm ± 0.2 mm
- Cooling system: AIR-COOLED
- Number of carburation systems: 1
- Number of transfer ports/ducts,cylinder/sump: 3
- Number of exhaust ports/ducts: 1+2 (1 elliptical port plus 2 boosters)
- Shape of combustion chamber: Spherical with squish
- Length between axes of the Connecting rod: 102 mm ± 0.2 mm
- Minimum weight of connecting rod: 115 g MIN
- Volume of combustion chamber: 9.2 cc MIN
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Type of bearings and size Conrod big end bearing: 20x26x15, Conrod small end bearing: 14x18x17, Crankshaft bearings: 25x52x15
OPENING ANGLES (all mesurement done with 0.20mm feeler gauge)
Tolerances: Inlet 126° ± 2°, Exhaust 164° ± 2°
- Carburetor Butterfly valve/24 mm
- Generator for battery
- Charging: On board
- Electric starter: On board
- Exhaust with flex: Exhaust with silencer
- Cylinder AL – SI ALLOY
- Connecting rod NI – CR – MO STEEL
- Crankshaft NI – CR – MO STEEL
- Head AL – SI ALLOY
- Liner IRON
- Crankcase AL – SI ALLOY
- Piston AL – SI ALLOY
- Piston Ring STEEL OR IRON
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