Join Date: Nov 2001
Location: Santa Clarita, CA
Motorcycle: 99 GSXR 750
Re: 750 main jet size?
Well it have been HOT the last few days, What RPM range are you running when you see the 188-200 temps?
As for your jet size, putting a 750 sized jet in is not really the best option, It would be better then too lean, but but you would likely be on the rich side since you can not flow as much air as a 750 carbs does.
I would say look into the service manual for the jet size, maybe running a stock 750 sized jet with your 600 carbs and your mods? But you would need to do a plug check.
Also, what spark plugs are you running?
99 GSXR750, yosh full race pipe, TRE, Tail light int., 180 rear tire, Almost Illegal Racing suspension, -1 front +3 rear sprocket, flush mount turn siganls, cut fender, 55,000+ miles!!!, Brembo Radial master, 4 pot brakes, balanced crank