Question about 1978 Suzuki GT 380

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I have a T reg suzuki gt 380. The problem that I have is that the left hand cyl(gearshift side) is mis-firing. Occasionally it will run O.K but most of the time it misses, causing a very loud back fire with a small flame even coming out of the exhaust. I have cleaned the carb, checked the points , swopped the condensor over with one of the other two,with no inprovement.Also although the battery is new it will nearly go flat in about 40 mins if the ignision is left on , is this a sign of the problem?? In the Haynes manual it tells you how to do the ignition timing manually, but I'm confused as to which casting I should be lining the alignment plate line with, as there seems to be two casting, one which goes right to the bottom of the housing, and one which can only be seen thru the aperture. From these descriptions where do you think I should be looking to rectify the misfire, many thanks.

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I would change spark pluge first.............Fire it up in the dark and make sure the bike is not jumping spark from one of the coil or spark plug wires...........Hope this helps

Posted on Aug 21, 2010

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