Slight knock?
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Joined: Oct 2011
Posts: 89
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From: Fort Sask
Slight knock?
When I am on the highway and i do short bursts of on and off the throttle I can hear a slight knock from somewhere low on the engine. its only once for each motion...(throttle on..knock...throttle off...knock) its like something hitting metal to metal. Any ideas?
Road Captain
Joined: Apr 2007
Posts: 679
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From: Fairbanks, AK.
There's normal play in the:
Rear end...there's a rubber cushion between the wheel and drive pulley that absorbs shock.
Transmission...some bang back and forth due to gear lash/clearances.
Primary chain...if not tight, can provide some play between the compensator drive sprocket and the clutch/driven sprocket.
Compensator sprocket...it can rotate as designed to cushion shocks between the crankshaft and the clutch.
All can make noise like a knock. So can an intermittent ping before the ECM retards the spark if detected, but that's another topic.
Rear end...there's a rubber cushion between the wheel and drive pulley that absorbs shock.
Transmission...some bang back and forth due to gear lash/clearances.
Primary chain...if not tight, can provide some play between the compensator drive sprocket and the clutch/driven sprocket.
Compensator sprocket...it can rotate as designed to cushion shocks between the crankshaft and the clutch.
All can make noise like a knock. So can an intermittent ping before the ECM retards the spark if detected, but that's another topic.
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Joined: Oct 2011
Posts: 89
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From: Fort Sask
Motor mounts and fasteners all look good. It does kinda sound like it could be chain slap but it sounds a little more solid and maybe not from that area. As far as the comment about it being normal. I don't know man none of my other Harley's do it.
Road Captain
Joined: Apr 2007
Posts: 679
Likes: 120
From: Fairbanks, AK.
Try this. Power on, power off. Try to tighten the top of the primary chain and loosen the bottom run via power on, then off. The auto adjuster should take up the chain tension after a couple of these when the bottom goes slack if that's the problem. I can hear the transmission gear slack as a light metallic clank in my '14 Road King with just light power on-off.
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I am referring to the gear slap....if I am in 5th gear running 40-50 and get in the throttle then let out I can hear the play in the gears. It was the same on the Honda VTX with under 5000 miles on it so doesn't seem to be anything new to the Harley. Maybe not the same noise the OP is hearing but I would think that it's normal considering the industrial nature of the engineering in the transmission.
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