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je hi-compression piston

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i am going to get a je hi-compression piston but whats the highest compression they make i have seen a 13:5:1 compression, and i think i need to run race gas but i am not sure. how reliable is this piston at this high of a compression

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Its good! I have had it in my 250 for about 5-7 hours. But no you'll be good on 91 octane pump gas.

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you can run regular pump gas. 13.5:1 is not a lot over stock compression at all so you should be fine

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big-bore pistons that arnt really that dramatic. they have a 256cc piston and a 263 cc piston

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they dont actually have the 1 mm over pistons they list them but dont have them i had to have some 1 mm over 14.5s made to be able to run the bikes in the 450 class the cylinders had to be restamped 255 to be legal

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