angler Posted June 26, 2011 Share Posted June 26, 2011 since i put the bike back on the road the plugs are burning rich ,i put a colour tune test on the bike and it is showing all blue. is it the petrol [unleaded] against aleaded engine it would be great if any one could help thanks Link to comment Share on other sites More sharing options...
Baldini Posted June 27, 2011 Share Posted June 27, 2011 I don't know what a colour tune test is. It's not running right & plugs are coked up? I wouldn't think richness would be to do with leaded/unleaded fuel. More likely carb issue (jet sizes, needle & screw settings. Also check that your choke cables/slides aren't sticking & holding choke(s)on. Are both sides the same? Correct/good plugs? Ignition timing OK? I found the big carbs on LM's do need regular setting up to keep sweet. KB Link to comment Share on other sites More sharing options...
pete roper Posted June 28, 2011 Share Posted June 28, 2011 It's a 35 year old motorbike. Have the atomisers and needles ever been replaced? Pete Link to comment Share on other sites More sharing options...
guzzimeister Posted June 28, 2011 Share Posted June 28, 2011 It's a 35 year old motorbike. Have the atomisers and needles ever been replaced? Pete Hi if using a colourtune, flame should be showing blue with a touch of yellow. I would say your'e not far off. Be aware old Le Mans has an accelerator pump in the carb, so you need to have a good long run to check plug colour, as even when warm, blipping from idle will soot the plugs up due to the big gob of fuel that the APs will chuck into the engine. Cheers Guzz Link to comment Share on other sites More sharing options...
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