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I am trying to get new pistons for my ski's and with the vernier calipers I seem to measure about 75mm but in my book I think it says that stock should be 76mm. I am getting a bunch of stuff from someone on e-bay and he has pistons that are for a .25 bored over motor. Everything online seems to say that stock should be 75 too. Is the Clymer wrong?
 

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I am not 100% on this but my js 550 also measures 75mm. I believe 75.5mm is the next over bore. look for pistonkits on line by weisco they always say what the size is. Try pistondealer.com
 
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