Join Date: Nov 2008
Location: Morgan Hill, CA, USA
I Ride: Cafe Racer, Commuter, a Dirty one, and a Land Speed Racer.
if you're getting 50% more power, there HAS to be work done to the bottom end to compensate for the extra boost. Otherwise you strip the keys off the timing gears and bend connecting rods. I wouldn't put more than 5-7 psi through a stock bottom end, and you're only going to see about a 10%~ish hp gain through that bit of boost.
what about a bore/stroke kit? Yeah, it's a lot of work and not cheep, but it'll last you longer than abusing your piston rings like inmates at guantanamo, and stressing the valve train that hard. Besides, when the boost from the turbo blows the head right off the bike, think about where all those little pieces of sharp metal go...
I'm not saying don't do it, I'm saying do it right. If you're looking for 150+ hp out of a 600cc bike, you're going to have to build up the bottom end. There's just no way around it.
Setp one: Obtain 5-8 squares of clean, dry toilet paper.
Setp two: some prefer to neatly fold while others prefer the "wad" technique, but you need to condense the squares into a thicker unit of TP.
...do I really need to continue?