wiseco piston kit

[honda965]

it says bore; std...standard...020 and .040
i dont have my 300ex bored out only 400ex carb and k&n& complete exhaust would i get the std one?thanks

[2muchquad]

If your cylinder has never been bored get the std piston.If it has deep scratches in it it will need to be bored over .020 or so and thats when you'll get the .020 piston.

[bwamos]

I'm going to assume you also aren't familiar with piston changes.

Make sure you hone the cylinder before you install the new piston so the new rings can seat proplerly. Take it to a motorcycle/automotive shop, they can do it pretty cheap since you probably don't have the tools.