desert nut Posted March 3, 2008 Report Posted March 3, 2008 (edited) just had bike redone topend 65mm bore checked everything so i thought but when bike warms up on left side it backfires. when the choke is on it seems not to do it as much can anyone help me!! i am just about done with this piece ! it has great compression reeds are good new carb kits new crank seal :mad: whats next :: :: Edited March 3, 2008 by desert nut Quote
FireHead Posted March 3, 2008 Report Posted March 3, 2008 just had bike redone topend 65mm bore checked everything so i thought but when bike warms up on left side it backfires.when the choke is on it seems not to do it as much can anyone help me!! i am just about done with this piece ! it has great compression reeds are good new carb kits new crank seal :mad: whats next :: :: You've got an air leak somewhere on the side that back firing........... Base gasket, reed gasket, crank seal etc.? Quote
98_shee Posted March 3, 2008 Report Posted March 3, 2008 If your running stock intake boots check them for cracks, they are known for cracking, and causing an air leak Quote
desert nut Posted March 3, 2008 Author Report Posted March 3, 2008 If your running stock intake boots check them for cracks, they are known for cracking, and causing an air leak ok will check thank you guys for help without this forum i would be lost Quote
desert nut Posted March 4, 2008 Author Report Posted March 4, 2008 well i checked but i can not find the fn leak :: it gets warm and seems like the left side backfires but when i pull choke for a few seconds it looks like it sucks some fuel from left side to right on through carb cross over tube the i put choke in and it fires fine for a but :verymad: could it be the choke plunger :shrug: i don't fn know just throw'n it out there can some one help????? :: :: :: Quote
inthemail Posted March 4, 2008 Report Posted March 4, 2008 propane is great for finding an air leak. just a little trick you may be able to use more efficentley. mine backfired right before its death Quote
BaNsHeeJuNkEy Posted March 4, 2008 Report Posted March 4, 2008 do a leak down test and that was you will know for sure. then use soap and water on outside to see if it is a outside leak or inside. Quote
Screaming Yellow Zonker Posted March 4, 2008 Report Posted March 4, 2008 the backfire is most likely a lean pop. How do your plugs compare? if one is light and one dark than you have an air leak. If they both are light colored than you have a jetting problem. Good luck. Quote
inthemail Posted March 4, 2008 Report Posted March 4, 2008 if one is light and one is dark how sure can you be that its an air leak? could be a plugged up carb. the lean pop is definitley not a good sign. just a side thought tho (check your jetting and clean carbs anyway) give your coil wires a wiggle and make sure there not worn. ive lost fire in a cylinder before, loaded it up and then had it backfire when the cap seated onto the plug good enough to ignite. Quote
desert nut Posted March 6, 2008 Author Report Posted March 6, 2008 i can nit find prob. when i put half choke on it stops to backfire when warm can it be the carbs or it still may be an air leak i don't understand why it seems to work fine when choke is half on Quote
FireHead Posted March 6, 2008 Report Posted March 6, 2008 i can nit find prob. when i put half choke on it stops to backfire when warm can it be the carbs or it still may be an air leak i don't understand why it seems to work fine when choke is half on It works fine when the choke is on because the choke adds more fuel, thus relieving the lean condition................. :geek: Quote
desert nut Posted March 6, 2008 Author Report Posted March 6, 2008 It works fine when the choke is on because the choke adds more fuel, thus relieving the lean condition................. :geek: ok the lean condition due to air leak in system or jetting or both Quote
FireHead Posted March 6, 2008 Report Posted March 6, 2008 ok the lean condition due to air leak in system or jetting or both If it is popping only on one side, I would suspect it to be an air leak. Quote
desert nut Posted March 6, 2008 Author Report Posted March 6, 2008 If it is popping only on one side, I would suspect it to be an air leak. could it be the carb choke plunger because i am having a hell of a time finding the dam leak :ermm: . could the the head gasket or base gasket be blown if the mechanic did not torq the head down properly Quote
jharader Posted March 7, 2008 Report Posted March 7, 2008 could it be the carb choke plunger because i am having a hell of a time finding the dam leak :ermm: . could the the head gasket or base gasket be blown if the mechanic did not torq the head down properly check screw cap on top of plug, had many ngk's come loose and cause poor ignition. deffinately clean your carbs tho all it takes is a grain of sand to cause problems and make sure the slides are even when you pull throttle open, should open simotaneously. Quote
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