stock 400ex piston...

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11-06-2003, 06:38 PM

Yamaha660R

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stock 400ex piston...

what's the ratio....9:1??

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11-06-2003, 06:45 PM

mxquadracer

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stock 400ex piston...

that's what I HEARD, Honda never said on their site.

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11-06-2003, 07:54 PM

cals400ex

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stock 400ex piston...

its 9.1:1. it can't handle the higher compressions like the newer bikes since it is not liquid cooled. in return, with around 11:1 or higher you need to start mixing race gas with pump gas.

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