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you can bolt on the 500 topend and basically go, but i THINK the 400s ran 34mm carbs and the 500 uses 38?
but yes this is a much safer easier cheaper way to go. still dont know if cost would be worth the amount of gained performance.
 

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Discussion Starter · #6 ·
i would put a 500 in it, but i race it in lemans type lake race and it's should look stock to complie with the rules. i've heard of guys putting 500 in and then getting the head redone to say 400.
 
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