With just a hmf slippy you shoud have stock jetting except a 125 main jet.
300ex jetting problem/questions
I got a 1996 300ex with a k&n w/ outerware and removed airbox lid and a hmf slip on with stock head pipe. Really no other performance mods but i got a 40 pilot with a 130 main in it does that sound correct? Cuz i tryed 2 do a spark plug check but its freezing cold here and almost 2 feet of snow on the ground. The new plug i put in came out still shiny and looked new still. Shouldnt it have come out like a brown color?
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I'd say put the lid back on and put a 125 main in with stock pilot and you should be good to go.
when hmf sells you there pipe it comes with a 125 main.
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