98shee4mm Posted May 26, 2012 Report Share Posted May 26, 2012 Ok guys I have a 98 shee with a K&T 4mill stock cylinder, coolhead 18cc cut domes, 35.5mm mikuni flats and cpi inframes I bought about a month ago from a friend and the engine only has prolly 10 hrs total on it and it dont fire right on the left cylinder at an idle and a little off idle but it rips great when you give it the gas and seems to fire great when rippin it. I have checked everything I can think of it has good fire and switched out cdi the stator isnt that old, I have cleaned carbs extensively and resynced, checked reeds it has vforce3 it has 165# compression both sides and not coolant burning or lose and the filters are clean and the timing is set at 5. Any ideas would help thanks in advance Quote Link to comment Share on other sites More sharing options...
Bkm2006 Posted May 26, 2012 Report Share Posted May 26, 2012 How old are ur spark plug boots? Try switching them around. Also if u have powder coated frame did u chase all ur threads for ur cdi coil and ect?? I had this problem once , Jeff ended up chasing all the threads and it was all good Quote Link to comment Share on other sites More sharing options...
98shee4mm Posted May 26, 2012 Author Report Share Posted May 26, 2012 Forgot some info I do have new boots on and tried switching plugs and wires still no change whats really puzzling is at high rpm or if I rip the throttle the left side fires good but not at idle or a little off idle Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted May 26, 2012 Report Share Posted May 26, 2012 How did you sync the carbs? Quote Link to comment Share on other sites More sharing options...
98shee4mm Posted May 26, 2012 Author Report Share Posted May 26, 2012 I dont have a sync tool but I spent prolly an hour by eye and the slide both are flush with carb opening at the same time and they both start to open the same and air screws are both at two turns out and 50 pilots with 340 Mains float height good and idle is set the same on both carbs Quote Link to comment Share on other sites More sharing options...
maskmanLS6 Posted May 26, 2012 Report Share Posted May 26, 2012 I dont have a sync tool but I spent prolly an hour by eye and the slide both are flush with carb opening at the same time and they both start to open the same and air screws are both at two turns out and 50 pilots with 340 Mains float height good and idle is set the same on both carbs Have you checked your needle clip positions? I had a problem recently with a bottom end miss and it turned out i had the needles set too high and was running too rich right off idle. I have stock carbs so i dont know much about the carbs your running but it might pay to try lowering your needles one clip position and try it. Quote Link to comment Share on other sites More sharing options...
98shee4mm Posted May 26, 2012 Author Report Share Posted May 26, 2012 Tried the needle its all the way down and I neex to jet the main down some but I would like to get this issue solved before I tune for best performance Quote Link to comment Share on other sites More sharing options...
maskmanLS6 Posted May 26, 2012 Report Share Posted May 26, 2012 Tried the needle its all the way down and I neex to jet the main down some but I would like to get this issue solved before I tune for best performance Try going down one size on your main, if that cures it then start raising your needle until its too rich again. Once your there then you can just lower your needle back down one clip pos. and you should be close to the best performance. Quote Link to comment Share on other sites More sharing options...
98shee4mm Posted May 26, 2012 Author Report Share Posted May 26, 2012 Could be wrong but I dont think its a jetting issue cause it would be the same on the other cylinder right Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted May 27, 2012 Report Share Posted May 27, 2012 I find someone with the sync tool as I had an issue like this after I rebuilt my carbs. Grabbed my FAST sync tool and checked and it was the idle was turned down too low on the left carb....turned it and synced both carbs and it straightened everything out... Quote Link to comment Share on other sites More sharing options...
350333 Posted May 29, 2012 Report Share Posted May 29, 2012 have you checked the wireing harness with a contenuity tester might have a nick in it. and why do you have cpi inframes on a stock cylinder jugs doesnt make sence to me. Quote Link to comment Share on other sites More sharing options...
bluebanshee98 Posted May 29, 2012 Report Share Posted May 29, 2012 (edited) I find someone with the sync tool as I had an issue like this after I rebuilt my carbs. Grabbed my FAST sync tool and checked and it was the idle was turned down too low on the left carb....turned it and synced both carbs and it straightened everything out... x2. that is prob what will fix your problem since it runs fine when you give it gas or ride it. and why do you have cpi inframes on a stock cylinder jugs doesnt make sence to me. i beleive he said he bought it about a month ago off a friend so thats prob why. 98shee4mm..... i would highly suggest porting your cylinders since you are already 4 mil and have pretty good pipes carbs ect. its the missing link in that build! it will make a big difference. call kev at hjr or jeff at fast. they do excellent work. you wont be disappointed that you did when its all together. you can also get a carb sync tool from jeff at fast Edited May 29, 2012 by bluebanshee98 Quote Link to comment Share on other sites More sharing options...
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