5hp flathead briggs mods velodrome bike racing

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grunta

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Hi guys

New to the forum, just looking for some specs on exhaust and how much to shave off head to raise compression and i know they around 5:1 ish standered , how much is too much?!

Down here in New Zealand some mates and i have been building bikes with agricultural motors , im running a 5 hp 206cc flathead and keep coming close to getting beat by a dirty honda ohv waterblaster 5.5hp which sux as u can prob tell.

Anyway want to raise compression and make a triple stage header just looking for specs on optimum diameter and lengh for each stage, also, is it worth thinking of cam? ive been looking at a bunch of stuff and it seems ill have nothing down low if i upgrade cam which at the moment is my saving grace as i can get off the line first.


Your thoughts...
thanks
Nick
here is a couple links to velodrome racing in nz if your interested

http://www.youtube.com/watch?v=q76iR7_k1Hg

http://www.youtube.com/watch?v=WIwCzyTcqXU
 
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