if you want a reliable jump in power i say 904. many have runs it, tons of miles on them and they have been rock solid reliability. if you want top power go for one of the newer 1100 or 1200 kits that still run 10.5 compression which is perfect for a street bike. but money is needed for the larger kits
Frank
(Former)05 BA tbike pipes, ai removed, Freak, mikuni hsr 42's, 904, ported/polished head, 1mm oversized valves
NOW-2010 silver and black tbird
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