jetting

[gncc571]

i just bought a 400 that has pro circuit t-4 slip on ,i put a k@n air filter on it and was wanting to know about jetting.the motor is still stock.some people have told to change it and some have told me to leave it at stock jetting. any help would be great ,thanks: :confused:

[timewass]

I run an airbox lid with a 160 main and a 42 pilot. I didn't move the needle clip. Check your plug.