seanus100 Posted March 2, 2012 Report Share Posted March 2, 2012 Sherco 2011 290 When the bike is started it runs ok on idle, but when applying power the bike backfires and there seems to be a spark at the back of the engine manifold, then cuts out... I've checked the wires and there docent seam to be a short anywhere... Any ideas please its got me beat.. Thanks Sean Quote Link to comment Share on other sites More sharing options...
copemech Posted March 3, 2012 Report Share Posted March 3, 2012 Sherco 2011 290 When the bike is started it runs ok on idle, but when applying power the bike backfires and there seems to be a spark at the back of the engine manifold, then cuts out... I've checked the wires and there docent seam to be a short anywhere... Any ideas please its got me beat.. Thanks Sean Uh, good one? Change the sparkie first, Spark from where? Insure the earths undr the tank are good clean and tight. Quote Link to comment Share on other sites More sharing options...
seanus100 Posted March 3, 2012 Author Report Share Posted March 3, 2012 Thanks, the spark appears on the engine near were the rubber manifold cornets to the engin, I've checked all the wiring and earths,, I'll changed the spark plug , I'll let you know,, thanks Quote Link to comment Share on other sites More sharing options...
copemech Posted March 4, 2012 Report Share Posted March 4, 2012 Something is not properly earthed! Frame, engine, coil? Quote Link to comment Share on other sites More sharing options...
kramit Posted March 7, 2012 Report Share Posted March 7, 2012 If the flywheel key shears, the Ign Timing may only change slightly which can cause symptoms similar to what you discribe. Quote Link to comment Share on other sites More sharing options...
chewy Posted March 7, 2012 Report Share Posted March 7, 2012 Any progress... used to be that misfires under load pointed towards HT problems..... i.e anything after the CDI/coil..HT coil....lead.... plug Quote Link to comment Share on other sites More sharing options...
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