06-07-15, 06:15 PM
Agree with Darsi the air filter is one of the first things to check, you'd think 9 plugs would be ok esp as our general temperatures are probably higher than when yamaha made the recommendation. The tps on mine won't adjust but seems to pull cleanly right through the revs? One of my high mileage bikes responded well to a carb swap after similar symptoms to yours. I think next time i get a bike that don't run evenly am going to invest in a laser thermometer to get an accurate idea of the eveness of cylinder ( exhaust ) temperatures, not definative i know but might save some grief/money.