Join Date: Nov 2001
Location: Santa Clarita, CA
Motorcycle: 99 GSXR 750
Re: Bike Temp when warm vs idle
So likely your carbs are not jetted correctly for the change in muffler.
CCM will likely chime in here in a bit, but I would say that you need to step up the pilot jets on the carbs, maybe even the mains to get better over all performance out of the bike.