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kfx450
12-12-2009, 09:00 PM
what piston will fit in a stock bore 90 polaris. need to replace piston and rings wondered what a cheap replacement would be.
12-12-2009, 10:51 PM
you have a 52mm piston if you look on ebay you can buy piston and rings for 25.
kfx450
12-13-2009, 06:09 AM
wastn't sure what all fit. Most other types of bikes have different wrist pin heights and stuff. wasn't sure if differn't bikes took different stuff or if all of these minirelli motors took the same piston unless you put in a different crank.
kfx450
12-13-2009, 06:09 AM
wastn't sure what all fit. Most other types of bikes have different wrist pin heights and stuff. wasn't sure if differn't bikes took different stuff or if all of these minirelli motors took the same piston unless you put in a different crank.
12-13-2009, 06:17 AM
Yes if it has the stock crank I believe its a 77mm cylinder you use the 12mm pin. Yes all basic yamaha jog 52 mm piston should work fine for you. Let us know if you need help to replace it always remember arrow goes towards exhaust on the piston.