MacDaddy racing Posted November 25, 2012 Report Share Posted November 25, 2012 Pretty much stock banshee with T3 pipes and air filters. When the bike is running it will run fine but will randomly backfire out of right cylinder tail pipe. It makes a "whoosh" sound as if the exhaust is igniting twice. The problem does not follow carbs or ignition wires. Thought it might be a lean condition but not sure why it only happens once in a while. Also when I take off it will backfire and then die. Can't seem to pin point the problem. Any ideas or pointers would be great. Thanks guys Quote Link to comment Share on other sites More sharing options...
Phelps Posted November 25, 2012 Report Share Posted November 25, 2012 compression test...... Quote Link to comment Share on other sites More sharing options...
mmoosemn01 Posted November 25, 2012 Report Share Posted November 25, 2012 coil? Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted November 26, 2012 Report Share Posted November 26, 2012 Comp check, then check the reeds. My bet is reeds. Quote Link to comment Share on other sites More sharing options...
MacDaddy racing Posted November 26, 2012 Author Report Share Posted November 26, 2012 Sorry forget to mention, I did a compression test and I got 120 psi on each side. And don't think it's the coil because I flipped ignition wires and the problem didn't switch cylinders. Reeds looked fine when I put them in but I will swap reeds and see if it follows cylinders. Thanks for the help. If you get any more ideas keep them coming. I appreciate it. Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted November 26, 2012 Report Share Posted November 26, 2012 Comp check, then check the reeds. My bet is reeds. x2. That's how my bike sounded when only one part of the pedal broke. Vf2 one on the inside. Looked fine looking through the intake, saw it when I pulled them. Quote Link to comment Share on other sites More sharing options...
AKheathen Posted November 28, 2012 Report Share Posted November 28, 2012 ....have you changed the plugs yet? after that, make sure you don't have an intake leak, and check the flywheel pickup gaps. if it started after installing the reeds, i would have to say it's likely airleak, or carb problem. bad exhaust packing could cause a poping, but usually will still run okay. also, bad float in the carb could flood it/load it up. almost sounds like fuel in the exhaust. Quote Link to comment Share on other sites More sharing options...
MacDaddy racing Posted December 3, 2012 Author Report Share Posted December 3, 2012 Finally got a chance to work on it. I started by taking the reeds off and both sets are brand new, not a single imperfection there. So I put them back in and tried to start it. Won't start, so I pulled the plugs and did a spark check. Spark on one side but not the other. So I flipped ignition wires and it gave a spark to only one plug. So plug wires are good but for some reason the right cylinder is fouling the plug out. If I pull the right plug and clean it it will fire for like 2 kicks then feel dead again. Only the right side is fouling out. So I brought the carbs home with me and I'm gonna check them over with a fine tooth comb. Also I'm runnin a 32:1 ratio. Maybe a little too much oil? Running br8es, I usually run br9es but for some reason this quad has br8's. Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted December 3, 2012 Report Share Posted December 3, 2012 br8's are actually what the bike calls for.......while you can run the 9's it is a different heat range plug that the bike does not need unless it is more or so setup for running it. Quote Link to comment Share on other sites More sharing options...
MacDaddy racing Posted December 3, 2012 Author Report Share Posted December 3, 2012 Wasn't sure on the plugs, thanks... Well I'm at somewhat of a stand still til I can try and figure this bug out. I worked on it again today and ruled out that the problem doesn't lie with the carbs. It's almost as if under a load the coil doesn't have enough power to create 2 full sparks. Could it be possible that I have an electrical issue here? I've pretty much ruled out all mechanical failures. Any and all help is well appreciated guys Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted December 5, 2012 Report Share Posted December 5, 2012 Is it doing this all the time now? Meaning its not longer doing it intermittent and each time you start the bike and try to drive away it does it? Does it seem to vibrate worse than normal or seem lazy when you rev it? Quote Link to comment Share on other sites More sharing options...
Phelps Posted December 5, 2012 Report Share Posted December 5, 2012 are you sure you did a compression check? was it recently? it's either not firing, or you have hung a ring. every cat hissing, backfiring bike i have ever ran accross was a coil or dead piston..... hissing/backfiring is loaded up fuel in the exhaust firing off from either no spark or not enough compression to fire it. Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted December 5, 2012 Report Share Posted December 5, 2012 I would look at things in this order 1- flywheel key 2-flywheel itself 3-crank phase If its not the reeds my next thought is that it is firing at the wrong time. Quote Link to comment Share on other sites More sharing options...
MacDaddy racing Posted December 5, 2012 Author Report Share Posted December 5, 2012 N20- I haven't gotten it started again because it keeps fouling out the right side cylinder. But when it was running it felt real lazy and was backfiring intermittently. Phelps- the compression was done a while back but has set since then. But I will do another compression check to make sure I'm not down on that side. Thanks for the help 1 Quote Link to comment Share on other sites More sharing options...
zekibanshee Posted December 6, 2012 Report Share Posted December 6, 2012 if its fouling the right cylinder plug maybe,you have a bad crank seal and its leaking trans oil into cylinder and thats why is fouling plug Quote Link to comment Share on other sites More sharing options...
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