April 13th, 2016, 06:23 AM
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#28
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ninjette.org sage
Name: bruce
Location: northern illinois
Join Date: Jan 2012
Motorcycle(s): Race bikes:08 Ninja 250,11 R6,16 ZX6,SV650.3 HD-1947,2-2003,2010. 1946 Indian and a lot of dirt bikes.2
Posts: 999
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Quote:
Originally Posted by RacinNinja
I wouldn't go any bigger than +1 Mm valves if you do.
The throat will need to be increased as well as the carb size to optimize flow.
I'm assuming you already have a full exhaust on it. Depending on cam overlap, it may be worthwhile to go +1 MM on just the exhaust valves to create more scavenging and draw more fuel/air into the chamber.
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Ya, my thoughts too. The 300 head has a 1mm bigger valve than the 250. I'll concentrate on the exhaust side.
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