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I'm thinkin about shaving the head on my o3 f5, how much could i safley shave off, how much is it, and where can i get it done??

What gearing shud i use for max top speed possible?? I have the 1.375 track, Thunder Shift clutch kit, and boyeseen reed valves. What shud the stock engage ment be? mine is at 4300 rpm.
Thanks for any input! :beer_cheers:
 

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At your age you're playing with fire shaving a head. 21-42 gears are about all the 1.375 track can turn, but you need a 72 pitch chain for that. Stock bump should be about 4300 I believe.
 
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