jd750ace....what do you recommend for top end cleaner? How much?
brianis....seems strange that you would start running rich. Try taking off your air cleaner and riding. If you have a dirty air cleaner removing it should immediately show a change.
If you have cracks in your intake manifold, it will let air in which would lean out, not richen your mixture.
Seems odd that you've run your bike for four years at altitude with no issues. When I use to ride my Yamaha YZ 250 (going from sea level to 5000 feet altitude) I would change the needle clip one notch higher which moved the needle farther down into the main
jet which leans out the mixture. Worked great and I did no other changes. I have a 2000 RS
with: Freedom Performance 4 inch true duals, Barons BAK
, a Barons ported manifold (that I ported even more because the porting it came with was a joke) and I live a sea level and have been chasing a rich condition for years. Best mileage I've seen is 35ish. I don't have issues with fouling plugs but they are black and sooty. I've changed main jets down to a 162.5 and kept a stock pilot
jet. I'd be very interested in what changed on your bike. Maybe as our carbs get older there is something in them that cracks (rubber?) allowing more fuel to leak into the intake circuit richening the mixture? Whats wierd is I can turn in my PMS
screw and there is no change. This just now started. Crazy though it runs like a scalded ape! I just wish I could get my plugs to run a tan color. Please keep us posted on your progress.