yamaharichey
XS650 Member
OK all you jetting experts, I'll try to make this short. 1980 XS650, stock carbs and air filters. Installed custom headers with shorty mufflers and put in 45 pilot jets and 145 main jets. Ran pretty good just a little popping off idle. mufflers too loud so installed
baffles in the shorty mufflers now back fires when its just sitting there idling and when you ride it and go to give it some gas, it just goes baaaaaa and doesn't accelerate, once you get passed that point just off idle into the mid range then it pulls hard and runs great. so my question is now that I put in the baffles should I go back smaller on the pilot jets or do I go bigger. I know some of you will say try it both ways but it is a pain in the butt to keep changing the jets. I live in Utah at 4500 ft. and I hoping somebody has already figured out the right jetting so I don't have to keep messing with it. Thanks so much and I'm sorry that it wasn't so short.
baffles in the shorty mufflers now back fires when its just sitting there idling and when you ride it and go to give it some gas, it just goes baaaaaa and doesn't accelerate, once you get passed that point just off idle into the mid range then it pulls hard and runs great. so my question is now that I put in the baffles should I go back smaller on the pilot jets or do I go bigger. I know some of you will say try it both ways but it is a pain in the butt to keep changing the jets. I live in Utah at 4500 ft. and I hoping somebody has already figured out the right jetting so I don't have to keep messing with it. Thanks so much and I'm sorry that it wasn't so short.