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Hello, I installed a full Muzzy Titanium exhaust, K&N air filter, and Dynojet Jet Kit on my ’02 6R in early May (5/3) and I am now having some serious tuning issues. I was wondering if I could get some advice from anyone with the same or similar combo, or from any carb experts. I’m not one of them….
Here’s the deal. I live in Kentucky, and the temp is now in the high 80’s to mid 90’s. In early May, the temp was high 50’s to mid 60’s. I used Dynojet’s recommended settings: 118 jets on two outer carbs and 120’s on two inner carbs, E-clip 3rd position from top. The bike ran fine after install, with a very small flat spot around 4000rpm.
Lately, it’s gotten much worse. If I give the bike full throttle between 3500-4000 rpm, the bike simply stutters, lunges, and will not accelerate until I ease up on the throttle. In general, the bike doesn’t feel as strong as it used to, although it still pulls pretty hard at the top. Thinking the bike is too rich, I shimmed the needles to be 2.5 positions from the top. This seemed to help the ‘dead zone’ by making the window smaller. The dead zone was originally in the entire 3000-4000 range. Trying for a courser adjustment, I changed the outer jets to 116’s and the inner jets to 118’s. This seemed to clean up the response as a whole, but the dead zone is still there.
Wondering if the bike was too lean, I ran it up near redline in 3rd gear (the highest gear I felt comfortable with, for obvious reasons) and eased off the throttle. The bike did not pick up power or lunge. Throttle response above 5500 rpm is good. The bike responds almost instantaneously when chopping the throttle or dumping it from fully closed.
I don’t believe it’s a vacuum leak. I sprayed WD-40 around the carbs while running, and the bike did not stutter. Checking the spark plugs, the insulators where a dull tan and the threads had some carbon buildup. The buildup may be from running the bike between 3000-4000rpm and varying the choke to see if it made a difference (it didn’t help).
Does anyone have any ideas? If there is anyone with the same setup, what jets and needle position did you use? I know every bike is different, but I’m currently not sure where to go from here. Low speed maneuvers are very difficult, and overall power seems down. By comparison: in May after the install, the bike was most definitely stronger than stock, albeit most was at the top.
Thanks for reading and for any help or suggestions.
Here’s the deal. I live in Kentucky, and the temp is now in the high 80’s to mid 90’s. In early May, the temp was high 50’s to mid 60’s. I used Dynojet’s recommended settings: 118 jets on two outer carbs and 120’s on two inner carbs, E-clip 3rd position from top. The bike ran fine after install, with a very small flat spot around 4000rpm.
Lately, it’s gotten much worse. If I give the bike full throttle between 3500-4000 rpm, the bike simply stutters, lunges, and will not accelerate until I ease up on the throttle. In general, the bike doesn’t feel as strong as it used to, although it still pulls pretty hard at the top. Thinking the bike is too rich, I shimmed the needles to be 2.5 positions from the top. This seemed to help the ‘dead zone’ by making the window smaller. The dead zone was originally in the entire 3000-4000 range. Trying for a courser adjustment, I changed the outer jets to 116’s and the inner jets to 118’s. This seemed to clean up the response as a whole, but the dead zone is still there.
Wondering if the bike was too lean, I ran it up near redline in 3rd gear (the highest gear I felt comfortable with, for obvious reasons) and eased off the throttle. The bike did not pick up power or lunge. Throttle response above 5500 rpm is good. The bike responds almost instantaneously when chopping the throttle or dumping it from fully closed.
I don’t believe it’s a vacuum leak. I sprayed WD-40 around the carbs while running, and the bike did not stutter. Checking the spark plugs, the insulators where a dull tan and the threads had some carbon buildup. The buildup may be from running the bike between 3000-4000rpm and varying the choke to see if it made a difference (it didn’t help).
Does anyone have any ideas? If there is anyone with the same setup, what jets and needle position did you use? I know every bike is different, but I’m currently not sure where to go from here. Low speed maneuvers are very difficult, and overall power seems down. By comparison: in May after the install, the bike was most definitely stronger than stock, albeit most was at the top.
Thanks for reading and for any help or suggestions.