engine knocking
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1st Gear
Joined: Oct 2016
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From: ottawa, Ontario
engine knocking
good morning all, i have a 1986 FXRP and a few days ago it started knocking somewhere around the rear cylinder. I did a compression test and there's a 25 PSI difference between the 2 cylinders. the troobleshooting i did so far is a compression test, checked the oil to see if there was gas in it ( i couldn't smell any) The engine is not smoking black or anything and it starts and run really well. the knocking is constant and goes up with the rpm. I have adjustable pushrods in it and it's the last thing i have to check. Any other idea what could cause this if the rods are ok???? thanks.
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Joined: Dec 2005
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From: poway
With a 25 psi difference between the cylinders I'd say the top end need to come off. I'd check the front motor mount and make sure the drive train is not hitting the frame around the side stand and bottom rear cross over.
Did you try a squirt of oil in the cylinders and compression again?
Did you try a squirt of oil in the cylinders and compression again?
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,830
Likes: 7,968
From: poway
This is likely a better guess..
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