I have searched through here for a while and cannot find a similar question to the one I want to ask. So here it is.
I have a 2000 XR400. 11:1 wiseco hi-comp piston, stage 2 hotcam, snorkel removed, twin air filter + cage, header welds ground, e series WB (12 discs) exhaust. The problem is it bogs down dramatically under load only on steep hills and makes tackling them very frustrating.
I ride mostly around sea level, current jetting is 162 main and 55 slow jet. plug seems about the right colour.
Is the answer a larger slow jet? With the mods mentioned should I be looking at a larger main jet?
Any input appreciated.