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View Full Version : witch piston (poll)


exrider008
04-29-2006, 04:45 PM
i need a new pistion for my 400ex and i dont know which piston i should get
and if u pick "other" plez say witch one i should get.
Blue250X
04-29-2006, 05:34 PM
right now i am running a Wiseco and the person who rebuilt my motor has been doing it since he was a kid (hes now around 40) and said all he ever uses is Wiseco, in everything, and ive seen his 350x, and its damn mint. But, ive heard of people saying they would not use wiseco, i forget why, but they used a different piston, but my wiseco has been holding up great.:devil:
exrider008
04-29-2006, 06:00 PM
ok anyone els
spud400ex
04-29-2006, 06:49 PM
i havent had anyproblems with wiseco pistons. had two in my quad, one for about 10 months then i tore it down for a big bore piston and its holding up fine.
cals400ex
04-29-2006, 10:16 PM
the problem with the wisecos is that the compression ratios used to be a ways off. i have ran je, ross, and wiseco. i would get the je or ross again probably. if i had to do it all over again i would consider a CP piston.
Blue250X
04-30-2006, 05:14 AM
Originally posted by cals400ex
the problem with the wisecos is that the compression ratios used to be a ways off. i have ran je, ross, and wiseco. i would get the je or ross again probably. if i had to do it all over again i would consider a CP piston.

yea, the ratios were off for 400ex's because it was the ratio for the xr400 and they have a thinner head gasket which rases the comp ratio, so teh 11:1 piston really had a ratio of like 10.8:1 or something
exrider008
04-30-2006, 10:25 AM
Originally posted by Blue250X
yea, the ratios were off for 400ex's because it was the ratio for the xr400 and they have a thinner head gasket which rases the comp ratio, so teh 11:1 piston really had a ratio of like 10.8:1 or something

if i get a xr400 base gasket would that fix the problem?
thanks!
RangerRick
04-30-2006, 11:17 AM
Yes,XR base gaskets fix the compression ratio.I am putting them in my 400ex with a standard bore piston and 11:1 comp.
exrider008
04-30-2006, 03:55 PM
bump!
jsmith2232
05-01-2006, 09:27 AM
I put in a je 10.8:1 and it runs great on both 93 octane and 110 which is nice when race gas isnt available but It runs great.
hondarider2006
05-01-2006, 10:12 AM
I ran a JE in my 416 and it ran strong until I ran out of oil. In my new 426 motor there is a wiseco and it also seems to run fine.
quadkrazy400ex
05-02-2006, 01:01 PM
ross racing piston, mine's been in for over a year now and no problems yet