popcorn Posted September 9, 2007 Report Share Posted September 9, 2007 please can anyone help when my ty 80 gets warm it starts to missfire , running a 50-1 fuel mix new air cleaner, new main bearing to take all play out of flywheel , new points mixture screw set at 1 1/2 turns currently running on b6 ngk plug would changing to a softer plug help as the plug is all black and sooty when missfire happens thank you Quote Link to comment Share on other sites More sharing options...
andy.t Posted September 9, 2007 Report Share Posted September 9, 2007 Hi,have you checked the float height,if its wrong this will effect your running mixture.Should be 23mm+or- 1mm.Also could be worth checking the needle clip position, should be second from top. Regards Andy. Quote Link to comment Share on other sites More sharing options...
popcorn Posted September 9, 2007 Author Report Share Posted September 9, 2007 Hi,have you checked the float height,if its wrong this will effect your running mixture.Should be 23mm+or- 1mm.Also could be worth checking the needle clip position, should be second from top.Regards Andy. thank you iwill check this cheers Quote Link to comment Share on other sites More sharing options...
bikespace Posted September 9, 2007 Report Share Posted September 9, 2007 Shouldn't the mixture screw be further out? Can't remember, thought it was nearer 3 turns? Have you tried a better plug, iridium or similar. We used to 'pop' plugs fairly often (every few weeks) until upgrading plugs which then lasted for over a year until we changed bikes. Quote Link to comment Share on other sites More sharing options...
samb Posted September 11, 2007 Report Share Posted September 11, 2007 It sounds like the condensor is breaking down , fit a new condensor and check the faces of the points these may be pitted , if so replace them . the new points will need the protective coating cleaning off the faces with glass paper . the the ignition timing will need setting using a points meter to check that the point are closing correctly , and a dial gauge in the spark plug hole . the correct timing should be 1.8 mm.before top dead center . Sam Quote Link to comment Share on other sites More sharing options...
popcorn Posted September 13, 2007 Author Report Share Posted September 13, 2007 sorry for delay in reply been working away thank you all for your help and will be in garage on sat go through all replies thanks again for all your help post findings soon Quote Link to comment Share on other sites More sharing options...
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