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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
DT120c 1976
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[QUOTE="Mad Norris, post: 1360060, member: 106417"] Sounds like you have an air leak somewhere. On a '76 bike it's likely that the LH crank seal has perished, but it can be replaced without splitting the crankcases. Just be very careful removing the stator and armature. It could also be a leak at the carb manifold, or cylinder base gasket, but my money's on the crank seal being blown. The lean mixture causes the engine to run much hotter than normal, so the running-on is probably caused by red hot carbon on the head. This should stop when you fix the air leak. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
DT120c 1976
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