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cliff0529 · September 13th, 2011, 06:05 AM

With the +2mm overbore, can you use and get good power out of the stock valves? I know the +6mm it requires you to use larger intake and exhaust valves. But if I had the head ported could the stock valves be retained and still make it into the upper 30's HP? Also, can the 13.5:1 be run on premium fuel or does it require race gas?

Rough calculations show that the +6mm at 12.5:1 and the +2mm at 13.5:1 would make pretty close to the same peak HP.

Another thing I had thought about, has anyone ever tried to lighten the stator rotor (flywheel) on these bikes? I used to road race some aircooled Ducati's and that was an easy way to get them to build RPMs and speed a bit faster.

September 13th, 2011, 06:05 AM	#89
cliff0529 ninjette.org member Name: Cliff Location: Georgia Join Date: Apr 2011 Motorcycle(s): 1999 BMW K1200LT, 2001 Aprilia Falco, 2008 Ninja 250R and a whole slew of dirtbikes! Posts: 64	With the +2mm overbore, can you use and get good power out of the stock valves? I know the +6mm it requires you to use larger intake and exhaust valves. But if I had the head ported could the stock valves be retained and still make it into the upper 30's HP? Also, can the 13.5:1 be run on premium fuel or does it require race gas? Rough calculations show that the +6mm at 12.5:1 and the +2mm at 13.5:1 would make pretty close to the same peak HP. Another thing I had thought about, has anyone ever tried to lighten the stator rotor (flywheel) on these bikes? I used to road race some aircooled Ducati's and that was an easy way to get them to build RPMs and speed a bit faster.