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piston choice for 05 400 EXC??

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I assume I am looking for a 89.00mm piston for a 450 as none of the manufacturers specify 400cc models. I am running the stock piston right now - what compression should I go with?? JE has a 13:1 and wiseco has both 12 and 11:1 comps.

What about the KTM pistons with their group I and group II sizing. how does that affect what JE or wiseco I buy?

thanks

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Talk with Travis over at Thumper Racing.

Are you sure you want to stay 400? I'll tell you the Thumper 453 kit is a majic motor.

I've built two of them now and I have NEVER heard anyone say they didn't like it. All the good traits of the 400 magnified.

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Talk with Travis over at Thumper Racing.

Are you sure you want to stay 400? I'll tell you the Thumper 453 kit is a majic motor.

I've built two of them now and I have NEVER heard anyone say they didn't like it. All the good traits of the 400 magnified.

quite happy with 400 - even considered dropping down. 400 is more than enough as I just race the odd enduro in the novice class (not long before that becomes vet) Getting brittle and want reliability over speed/power.

someone on ebay is selling high compression JE pistons with the gasket kit for under 200 - seems good to me as Orange Motorsports wants 300 for the piston alone.

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You can contact DJH for specifics, but he replaced my stocker with a Wossner piston. He also recommended CP and coated Weisco pistons.

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450 piston not the same wiseco makes one

not according to their website

also CP does not list a 400.

have not checked wossner as I'm getting annoyed, will just have to pick up the phone.:thumbsup:

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I have a 2006 400 and a 2007 453 with 5521 cam done by Dave Hopkins. The 453 is an awesome motor that carburates about as well as a fuel injected bike. I like the 400 slightly better for all out racing though. It vibrates a little less (453 is not bad, just a touch more vibration), revs easier, and the bike feels lighter and smaller. Not quite as clunky feeling. Both are great engines and I can see how a lot of people would love the 453.

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