Motorcycle Repair: jetted R-1, kn air filter, airbox

Question
I have a 1999 R-1, it seems to run a little rough. Sometimes it releasing gas out of the exhaust(verylittle). I let it warm up and still the same. I talk to a mechanic and he said maybe too rich or lean. I hinged the tank and removed the KN air filter. So i could take a look at the spark plugs. but i cranked it and it ran smooth. Do i need to modify the air box for more air or reduce the amount of gas? I ride around town alot, not much on the highway. Which is best solution for my problem?  

Answer
Hi lee,

I would have to be present and perform diagnostic tests to know whats happening with the air-fuel mixtures. I can't tell you what needs to be done without inspecting the problem.

Tuning carburetors is not an easy task. I recommend having an experienced Yamaha tech perform the tuning for you.

Tuning may be simply increasing air flow into the airbox to correct an overly rich A/F mix, or it may be more involved.

Learn about reading the appearance of the spark plugs to know what changes to make to the jetting. Visit NGK's website and browse the menus. www.ngk.com

Respectfully,
Mark Shively