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47.6MM BORE
39.2 MM STROKE
69.76CC
15.6:1 COMP RATIO
MUST USE CRANKSHAFT 210.0022
Polini Big evolution cylinders goes into the classes above the 72 cc. With the Big evolution cylinder line,Polini has come out with 2 cylinders. The first is a 84 cc (with original 39.3 mm stroke) and/or 94 ccm (in connection with 44-mm stroke). You will need to bore the engine case, see directions included for exact instructions on how to 9do this as per your model of scooter) Performance-related to the 84-ccm-Version should be on the level of the 70-ccm-cylinders, however with clearly more torque. If you will want more power,who doesn't, you should go with the 94 cc version. Check the site for the correct cyl or contact us.
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