Polini Big Evolution 70ccm is in every way a different kit, not only because of the look, but i.a. also due to clamping the exhaust flange has been changed so that it is now done with three bolts. The performance is, as always on the Polini Evolution 70ccm, top notch and with the right parts you are guaranteed good durability and high performance. For this cylinder kit, a spark plug with a long thread must be used and the kit is delivered complete incl. gaskets, piston ring, etc. NOTE: Due to the size of the skirts, it is necessary to mill up the engine block. The cylinder kit only fits the Polini Big Evolution 70ccm exhaust (3-bolt tightening) and rod85 crankshaft must be used. On the Gilera Runner, there may be problems with space for the exhaust due to the engine suspension. If this is the case, engine mounts from e.g. Gilera Stalker.
Generally | |
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Bore | ø47,6mm |
Class | Hyper-racing |
Piston pin | ø12mm |
Displacement | 70ccm |
Flush canals | 6 |
Stroke | 39.3mm |
Exhaust port | Two piece |
Material | Alloy |