Discussion in 'Sportster Models' started by HDSportster1200, Dec 27, 2009.
I hear a knocking sound when the engine is running. What is causing this?
Being as it is a 1200 conversion could be a loose piston. Did the knock start after the conversion?
Could be a peice of carbon came loose as well, try spraying water with a mist into the carb while keeping it running for 3 to 4 minutes, it should break it up and blow it out the exhuast. Maybe that easy, maybe not.
I would temporary throw a mechanical oil pressure gauge on it just to see if its a bad pressure fed bearing. Is the sound in syc with crank RPM.
Ive seen a lot of broken piston skirts on these sounds like a slapping primary chain
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