07 HERITAGE
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Stage II
Joined: Feb 2020
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From: Hudson,ma
07 HERITAGE
I did a oil change now my top end is sounding like a sewing machine. someone said it might have a air lock? never heard of that .
not sure if the oil pump went when leting the bike warm up. we had a very cold winter here in mass.
thanks
not sure if the oil pump went when leting the bike warm up. we had a very cold winter here in mass.
thanks
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,143
Likes: 11,214
From: San Diego, CA
Did you bring the engine to operating temp before the oil change?
Did you switch the brand of your oil filter?
Did you switch the viscosity (weight) of your oil?
What are the air temps now, while the engine sounds different?
Did you let the engine get to operating temps and it still sounds different than before?
A simple, proper oil change, using the same filter & oil, should NOT change the sound of the engine.....
You did not do any mods over the winter like changing cams or lifters did you?
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,143
Likes: 11,214
From: San Diego, CA
Based on above description, there should be no change in engine noise from the oil change....
Never heard of an air lock.....
Who told you that was a possibility...?
Depending on how different the sound is from when the engine last ran, changes in sound can signal an issue, or beginning of an issue.... Some are worth investigating....
Not hearing the before & after, I couldn't offer a guess in your specific case what could be wrong....
Last edited by hattitude; Apr 1, 2026 at 12:18 PM.
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