Loc Posted March 27, 2009 Report Share Posted March 27, 2009 The bike has gas coming out the left pipe and the exhaust is cold. The plug is not burnt at all and has unburnt fuel on it. The right side looks perfect. Does it mean that the cylinder is not firing. 1999 Banshee -FMF Fatties, K&N Pods -310 mains, middle clip, 25 pilot (stock carbs, tors removed) -Airscrew 2 turns out -cleaned carbs -new plugs -compression is good -Temp 45 degrees and elevation is 1400 feet Quote Link to comment Share on other sites More sharing options...
Woolfman Posted March 27, 2009 Report Share Posted March 27, 2009 I would have to say yes you are only running on one cylinder. I would put on a fresh plug and check for spark. Quote Link to comment Share on other sites More sharing options...
BansheeDan Posted March 27, 2009 Report Share Posted March 27, 2009 I would have to say yes you are only running on one cylinder. I would put on a fresh plug and check for spark. Also make sure the carbs are in sync. One other thing to do is swap the plug wires and see if it switches to the right side. that will pretty much tell you if its a carb problem or its electrical. Dan Quote Link to comment Share on other sites More sharing options...
slacker1bob Posted March 27, 2009 Report Share Posted March 27, 2009 I had the same problem with a stock mikuni carb. The left side would be cold and have a ton of fuel. I cleaned the carb and sincronized them and everything and could not get it right, finally I put a different set of stock carbs on and it worked perfect. Quote Link to comment Share on other sites More sharing options...
Loc Posted March 28, 2009 Author Report Share Posted March 28, 2009 I have another set of carbs on a different banshee. I think I will switch them out and see what happens Still taking ideas though Quote Link to comment Share on other sites More sharing options...
Mjv420 Posted March 28, 2009 Report Share Posted March 28, 2009 Check for spark on both plugs, try as mentioned and change the plug caps to see if the problem changes over to the other side. Quote Link to comment Share on other sites More sharing options...
Loc Posted March 29, 2009 Author Report Share Posted March 29, 2009 Switched the wires and no change. Could this be compression related. ALso when checking the compression do you only kick it over once then take the reading. Quote Link to comment Share on other sites More sharing options...
vulvafan537240 Posted March 29, 2009 Report Share Posted March 29, 2009 Switched the wires and no change. Could this be compression related. ALso when checking the compression do you only kick it over once then take the reading. no. hold the throttle wide open, kick it 100x if it takes it until you get the highest reading, and use a quality tester. also, is the choke tube connected between carbs? Quote Link to comment Share on other sites More sharing options...
sheerider1026 Posted March 29, 2009 Report Share Posted March 29, 2009 to check compression.. tkae both plugs out, screw your gauge into one cylinder, hold throttle wide open, and keep kicking until the gauge will not go any higher,, repeat process for the other cylinder.. Quote Link to comment Share on other sites More sharing options...
Loc Posted March 29, 2009 Author Report Share Posted March 29, 2009 I was trying to figure out why it runs better and the idle smooths out when the left plug wire is removed. Also I know it is different on every bike, but where is a good place to start with the idle screws. I think I have narrowed it down to a carb problem. I just dont know why the fuel is not being burnt in the left cylinder. I think I will have to get a set of different carbs and try that. Quote Link to comment Share on other sites More sharing options...
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