Another engine knock thread
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Road Captain
Joined: Feb 2014
Posts: 713
Likes: 12
From: Crowley TX
Another engine knock thread
I'm having an issue with my bike knocking when it's cold. The knock does not sound like traditional lifter noise as its a much deeper sound. The noise appears to be coming from the primary side of the engine but I can't pinpoint it. If I run the bike for about 20 minutes and let it come up to full operating temperature the sound almost disappears. I recently replaced my worn stock compensator with a baker comp and this didn't seem to affect the sound. This is going to sound crazy but i noticed the sound after an oil change using a wix filter and 20-50 mobile 1. Any advice on what to look for? Build is in my signature. Thanks!
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Joined: Jul 2015
Posts: 8,538
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From: SF Bay area
Can only offer this.... Mobil 1 is THE WORST as far as noise goes in my '15 Limited Low. I'm sure it's fine oil, but it just seems too thin or something, despite what "weight" it is. It would not surprise me at all if you changed oil & the noise went away.
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Road Warrior
Joined: May 2007
Posts: 1,434
Likes: 384
From: Arkansastan
Another vote for piston slap. Also not that M1 is a superior oil, but like most synthetics, it is on the low end of the viscosity scale, and tends to not cover up noise like an oil on the thicker end of the scale.
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Road Captain
Joined: Feb 2014
Posts: 713
Likes: 12
From: Crowley TX
This is a fairly new build on the engine so I'm really hoping it's not piston slap.... If it IS piston slap, what options do I have?
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Stellar HDF Member
Joined: May 2015
Posts: 2,095
Likes: 304
From: mid Michigan
The 99 Chevy's came stock with piston slap & would run along time like that. Change back to the oil before, like mentioned & run it
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Road Warrior
Joined: May 2005
Posts: 1,301
Likes: 24
From: Minden LA
Can only offer this.... Mobil 1 is THE WORST as far as noise goes in my '15 Limited Low. I'm sure it's fine oil, but it just seems too thin or something, despite what "weight" it is. It would not surprise me at all if you changed oil & the noise went away.