Re: 04 gsxr 1000 yoshimura cams
Stage 1 cams are good, but you'll probably knock a hole in the midrange giving you the feeling of an angry motor that kicks hard in the upper rev range, headwork (porting) to match the cams will fill that midrange out.
I've got much the same setup as yours, plus the Yoshi ECU (revlimit 13500) and mild headwork and my bike will pass a 2010 CBR1000 down the chute at Eastern Creek and I'm a big fat bastard, so extra top end power is available with these cams. I can tell you that I did the cam and headwork at the same time and it brought the motor to life, 12hp top end and extra all the way through the range too. Power tails off gently after 12750rpm, so with your stock limiter you'll be making power all the way to the top.
My cams are timed to yoshi specs at 105/105, also the valve clearances are much more precise with these cams, I can't remember the numbers but make sure the installer knows they have to be right. Stonger valve springs are a no brainer for mine, I dropped an inlet valve with stock cams and stock springs at the track, expensive.
Do before and after runs on the dyno and let us know how you get on.
GSXR1000 K1 road bike PCIII and Yoshi Pipe.
GSXR1000 K2 ex Suzuka 8 Hour race bike. Ohlins shock, damper and kitted forks, Brembo M/C. Titanium race exhaust, velocity stacks, BMC filter. Yoshi ECU and harness + PCIII. Yoshi Stage 1 cams, ported head, stock compression.
Last edited by bunabaroo; 07-09-2011 at 08:30 AM.