421venom Posted January 5, 2012 Report Share Posted January 5, 2012 hey guys i need help with my banshee its a 421, it was running awesome and at one race it suddenly stopped,now it has a hard time turning on n when it turns on it dies if i let go off the throttle but the main problem is that it wont run the way it should,,it makes a LOUD back fire from one side it feels very week, i changed the spark plugs and cleaned the carbs but still doing the same thing,any help is appreciated Quote Link to comment Share on other sites More sharing options...
Larry's Shee Posted January 5, 2012 Report Share Posted January 5, 2012 By off chance did you rejet for winter? Quote Link to comment Share on other sites More sharing options...
421venom Posted January 5, 2012 Author Report Share Posted January 5, 2012 By off chance did you rejet for winter? nope Quote Link to comment Share on other sites More sharing options...
beez33 Posted January 5, 2012 Report Share Posted January 5, 2012 When you put your hand where the exhaust comes out of the silencer does it feel the same as the other side such as pressure and heat, when you hit the throttle? Quote Link to comment Share on other sites More sharing options...
Phelps Posted January 5, 2012 Report Share Posted January 5, 2012 do a compression check. if that comes out ok then check the reeds. sounds to me like you wiped a ring out. Quote Link to comment Share on other sites More sharing options...
421venom Posted January 5, 2012 Author Report Share Posted January 5, 2012 When you put your hand where the exhaust comes out of the silencer does it feel the same as the other side such as pressure and heat, when you hit the throttle? as heat they feel the same,as preassure nope, the side thats backfireing is lower on compression Quote Link to comment Share on other sites More sharing options...
421venom Posted January 5, 2012 Author Report Share Posted January 5, 2012 do a compression check. if that comes out ok then check the reeds. sounds to me like you wiped a ring out. how do you check the compression? Quote Link to comment Share on other sites More sharing options...
quadpro26 Posted January 5, 2012 Report Share Posted January 5, 2012 a broken reed Quote Link to comment Share on other sites More sharing options...
beez33 Posted January 5, 2012 Report Share Posted January 5, 2012 Go buy yourself a compression tester. They aren't to expensive. Screw it in where your spark plug goes and kick the bike over till the needle stops moving. If you don't want to buy on you can put your thumb over the spark plug hole on the good and bad side and look for the difference. Might be a broken skirt on piston if compression is low. Quote Link to comment Share on other sites More sharing options...
421venom Posted January 5, 2012 Author Report Share Posted January 5, 2012 Go buy yourself a compression tester. They aren't to expensive. Screw it in where your spark plug goes and kick the bike over till the needle stops moving. If you don't want to buy on you can put your thumb over the spark plug hole on the good and bad side and look for the difference. Might be a broken skirt on piston if compression is low. thanx i will try it, if i put my thumb should i feel something? Quote Link to comment Share on other sites More sharing options...
beez33 Posted January 5, 2012 Report Share Posted January 5, 2012 Ya. You will feel compression/air pushing out of that hole on your dick pinchers. Quote Link to comment Share on other sites More sharing options...
421venom Posted January 5, 2012 Author Report Share Posted January 5, 2012 reeds are good Quote Link to comment Share on other sites More sharing options...
Phelps Posted January 5, 2012 Report Share Posted January 5, 2012 take the pipes off. bet one of the rings on the exhaust side are broke. Quote Link to comment Share on other sites More sharing options...
willaduncan Posted January 5, 2012 Report Share Posted January 5, 2012 dont use the thumb trick just go buy you a compression tester for around 80 bucks check the compression do it right Quote Link to comment Share on other sites More sharing options...
421venom Posted January 5, 2012 Author Report Share Posted January 5, 2012 take the pipes off. bet one of the rings on the exhaust side are broke. hey man i just checked on that ring and it wasnt placed where it should be it was hanging on the outside of the pipe,could that cause that problem?? Quote Link to comment Share on other sites More sharing options...
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