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400ex piston kit choice je or wiseco
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Posted by: bradrychlik

can someone please give me some advice on what to choose. 87mm, 88mm, or 89mm piston kit, je or wiseco

thanks

Posted by: 400ex28

JE

Posted by: jak1389

get the je 87mm 10.8:1 comp piston. we good power. wiesco's compression ratios are not accurate when it comes to the 400ex.

Posted by: bradrychlik

what has more horsepower?
416 426 or 440 kit
what is the best compression to use?

Posted by: 03pissedoff426

i like the 426 88mm im using the JE 13:1 piston and it was mean, before my last rebuild. now i need a new connecting rod.

stay with a lower comp. piston or you will be rebuilding your bottem end as i am

Posted by: bradrychlik

thanks for the advice

Posted by: underpowered

i think the 426 is the best bore for the 400ex. i have a JE 11:1 426. i would stick to about 11:1 comp., you can still run 93 pupm gas and run great.

Posted by: IRONMIKE113

so u would say the 426 is better out of the three that answers my question,do u anyone who sells a package deal with 426 kit .

Posted by: 426ex

I'd definitely say the 426. Mine has a 10.5:1 comp and I haven't had a bit of trouble...my son though has a 12:1 in a 440 kit and the bottom end locked up this weekend. We'll be rebuilding this week looks like.

Posted by: 400exrider707

I have a JE 416 10.8:1 piston for sale if anyone is interested.

Posted by: ommkevin

is it the quad or the motor

Posted by: 400exrider707

quote:
Originally posted by ommkevin
is it the quad or the motor

???

Im not sure what your asking here?

Posted by: bradrychlik

THANKS GUYS, I CHOOSE THE JE 416 KIT FROM C&D RACING, GREAT PRICE

Posted by: 03pissedoff426

smart move, i hope you like it!!!