Dull knocking sound
#1
Dull knocking sound
Hi guys. New shovelhead owner here. It’s a 1980 Flh supposed to be a low mileage but who knows! The screws on right hand side of the engine have never been touched. Couple of oil minor oil leaks but nothing serious. My question is that I have a dull knocking that sounds like piston slap on acceleration especially between 40 and 50 mph. Is a small amount of piston noise acceptable on a shovel? I don’t have another shovel to compare it to. Ireland is a strange place, nobody seems to want to help out. I’m not new to Harley Davidsons or motorcycles and I always do my own work. Thanks
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If a crank pin roller set has worn the crank pin in one spot ( this is how it starts ) - then while in hi gear at 50MPH or 88 klm - slightly roll back on the throttle just a bit to remove the engine load on the bike - if you hear a rattle then the crank pin is damaged from wear - flat level road is best
it will come in and go away with slight throttle movement at that spot - that is the beginning of real damage to come - take it apart
it will come in and go away with slight throttle movement at that spot - that is the beginning of real damage to come - take it apart
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Racepres (08-30-2022)
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#6
I went over the engine with a home made stethoscope last night and front and rear top ends make the same tapping clicking sounds, barrel and bottom end sound quiet. Intermittent knock or slap in primary. Chain is adjusted properly and engine nut was removed cleaned and torqued about 700 miles ago.
I have a chance to ride another shovelhead in the next month or so so I can compare noises.
One thing. Could the sound in hearing be induction noise? Thanks for all the help.
I have a chance to ride another shovelhead in the next month or so so I can compare noises.
One thing. Could the sound in hearing be induction noise? Thanks for all the help.
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Crankpin2ie (09-01-2022)
#9
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Crankpin2ie (09-01-2022)
#10
What makes me think it might induction noise is that the noise increases the wider the throttle opening. I’m going to remove the air cleaner and see does it change the sound.
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Squidbilly* (09-01-2022)