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Kolben -GRAND SPORT- Vespa Polini 210 ccm - Polini 221 ccm - 2 piston rings - A

partnumber 3330648

you have 3 options
price: € 128,99
price: € 128,99
price: € 128,99

Delivery time: 1-2 days, Express 1 day*

GRAN SPORT Piston for Polinis 207 cc cylinder kit. Diameter 68mm.
Reinforced conversion piston for Polinis 207 cc kit. The main improvement is the cross strut in the large piston window.
Piston layout and boring clearance are said to be optimized. Very nice is the thin 1 mm chromed piston ring.

Very good informations about this piston and how to improve it further, you will find in Scootering magazine edition 232. Mainly the angular piston windows should be rounded to reduce the stress to the piston. The cross strut in the large piston window can be traeted to optimised gas flow. Just have a look at Scootering magazine.
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