i have the bike running after 11 years and as i went with open aftermarket pipes I went with a main jet of 135.5 rather than the .135 jet, now I can not get over 3500 rpm,s with out it cutting out and back firing?? runs good up to that point, seems to backfire when letting off throttle also??? that did I do wrong???? i am also missing the rubber plugs in the idle jet holes,,,,????
2007-07-28 18:10:34 · 3 answers · asked by ben 1 in Cars & Transportation ➔ Motorcycles
the rubber plugs are in the idle jet holes,, rumor was they slide up and blocked the idle jets at high speeds,, melted them in place during first soak. carbs been cleaned twice, went up one size in jets due to pipes,. shouod go another eh??
2007-07-28 19:28:03 · update #1
rubber plugs are in the float bowl below the intake idle jets,,,,,,
2007-07-28 19:29:17 · update #2
never questioned the new filters, made from UNI-foam and its thicker and would be more resistant to air flow. you both have been very helpfull - thanks
2007-07-29 06:36:17 · update #3
ran with no air filters, still shuts down at 4000 rpm,s did seem to run better, thinking of making some alum plugs for the idle jet holes, i do tooling work :) and will also install larger jets, thinking of going 4 sizes up,,
2007-07-29 08:49:28 · update #4
Running lean. Change the main jet to a larger size. Always start rich and work your way back to be safe. Running a motor lean is no good. Those rubber plugs might be to keep your air screws from backing out. Usually the holes have springs in them under the screw for that though. You can check by simply taking the screws out. But first note what they are set at. Count the number of turns it takes to seat the screw.(should be about 3 or so full turns). Then back the screw out and check. When you put them back, seat the screw and use the # of turns to back the screw out to where it was.
Also, make sure you are'nt gummed up inside your carb. If you have blocked jets or passageways it'll foul you up. Since the bike has been sitting, it's likely thats the case.
2007-07-28 18:35:07 · answer #1 · answered by FangStu 3 · 0⤊ 0⤋
I've always had problems when removing the rubber plugs.
Check the rubber diaphragms on the throttle slides for cracks, tears, or not sealing in the groove when the tops are installed (the last one is a common problem).
Contact me for a carb trouble shooting guide.
It will explain what needs to be changed to repair certain running conditions.
Jetting is like throwing darts at a dart board, hoping you get it right.
The guide will tell you what circuit is at fault and quicken the repair time.
2007-07-29 07:20:47 · answer #2 · answered by guardrailjim 7 · 0⤊ 0⤋
Fang did a good job. I agree with everything he said. You probably need to go up 4 or 5 sizes from stock on your jets in my experience, I assume you changed the air filter too? Air flow is controlled by restrictions coming in and going out, if stuff goes out way faster than it comes in you can have problems.
2007-07-29 03:45:28 · answer #3 · answered by gw1500rider 2 · 0⤊ 0⤋