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Originally Posted by nc vulcan 800
too acess the a/f screw the plug on top of it has to be drilled very carefully & removed with the carb removed, i tried that on mine but had better results going up one size on the main jet.& also drilled & removed the plug on mine to acess the a/f screw,but its a good idea to count the turns it takes to bottom the screw out & write the number of turns down ,in case you want to go back to the stock setting for a reference. just my 2 cents worth  |
If you are running a K&N filter with the stock air box, use a 145mj, 48pj, and turn the a/f out like Woody said. That's with either debaffled stock or aftermarket pipes. If you scooterize or grampsize go with a 165mj, 50pj if using an aftermarket needle, a/f screw out 2 and a half turns, 170mj, 52pj if using the stock needle, a/f screw out 1 and half turns. Be sure to have either aftermarket pipes or at least debaffle the stocks.