thedoctorupton Posted August 12, 2005 Report Share Posted August 12, 2005 i had to put a new crank in and go 0.30 over so i bought a new noss w/19 cc domes. the problem is the right side back fires while the left side seems to be fine. i used the advise i read on the hq and switched the plug wires with no change, also i switched carbs, no change. i switched reed cages, no change. both plug wires have spark and the carbs are set the same in every way the book (clymer & yamaha service manual) specifies. what am i missing? fyi my banshee has stock carbs except for the tors removal kit with 280 mains the needle is in the 4th pos. running turbo blue at 30:1 w/926 . toomey t5's at sea level and sport port if that matters. i know you guys can help me, this is all i think about and it is going to be the death of me please help Quote Link to comment Share on other sites More sharing options...
BansheeBoy17 Posted August 12, 2005 Report Share Posted August 12, 2005 (edited) Did it run fine before you rebuilt it? Was it a total rebuild or just the top end? Could be the pickup coil gap, I had the same problem, it was running on one side and i switched the plugs and the problem didnt switch sides. I even put on a new coil, cdi, harness, fresh piston rings, gaskets, alot more - I had about the same problem. Truned out to be something simple like my pickup coil gap being off. Its supose to be .018 go check that... Just my 2 cents. That problem costed me about 3 months lmao Edited August 12, 2005 by BansheeBoy17 Quote Link to comment Share on other sites More sharing options...
thedoctorupton Posted August 12, 2005 Author Report Share Posted August 12, 2005 yes it run like a spotted ape until the crank bearing give up, i rebuilt it and cranked it finding this problem. i will try gapping it thanks so much Quote Link to comment Share on other sites More sharing options...
switchblade Posted August 12, 2005 Report Share Posted August 12, 2005 Did you do a leak down test on it before you ran it. I kinda sounds like an air like on the right side which leans it out and causes it to pop. Quote Link to comment Share on other sites More sharing options...
RBD Posted August 12, 2005 Report Share Posted August 12, 2005 Is this at an idle...? or is it on the mid or top end...? Quote Link to comment Share on other sites More sharing options...
frocashmoney24 Posted August 12, 2005 Report Share Posted August 12, 2005 check the intake boots, may have a crack in them, especially if you have a boostbottle. Quote Link to comment Share on other sites More sharing options...
thedoctorupton Posted August 12, 2005 Author Report Share Posted August 12, 2005 i did not do a leak down test as of yet but i am finding a lot of raw fuel on the plug and in the jug. would this be a symptom of an air leak? i am having this problem at an idle i havent tried to bring it up past that for fear of more damage. i do have a boost bottle, as for as the seals they look ok, but what do i know? please run this info through your computers and tell me what to do pleeeaaase. Quote Link to comment Share on other sites More sharing options...
charles Posted November 30, 2006 Report Share Posted November 30, 2006 I have the same probleme right now on mine!!!! but on the left side.. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted November 30, 2006 Report Share Posted November 30, 2006 also i switched carbs, no change. How did you switch carbs, stockers? Side to side...or with a different set? Reason I ask is they have a left and right carb... Chock tube on? Get rid of that turbo blue BS. Unless you're running a lot of compression or timing (which, was not listed in your mods) all you need is pump gas. I too say get a leak down tester and check....you could've very easily not sealed it up or installed the crank seals wrong.... Quote Link to comment Share on other sites More sharing options...
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