M8 Compensator Upgrade
Road Master
Joined: Apr 2014
Posts: 1,023
Likes: 380
From: Philly Burbs
Interesting. I wonder how much heavier it is than the stock piece.
Seasoned HDF Member
Joined: Mar 2010
Posts: 38,586
Likes: 6,435
From: Honah Lee
She said the M8 OEM part is aluminum. I question that one big time!?? She said compensator protects drive train. That is not true. It will wind up solid. It's actually just to smooth out V twin impulses.
The rubber isolator in the rear sprocket protects the drive train on the big cruisers. As Harley grew their motor, they had no choice.
If their part was made from 4340 (nickel chromium molybdenum), it would be tough all the way thru.
I do like it that it appears to have a nice finish on the ramps. May be a little quieter at idle, least for a while.
BigT12, is your broken part magnetic? What happens when you miss a shift. I have done it a few times. Especially when I rode year round in the winter all bundled up. Didn't quite hit it hard enough and it failed to pull in when I came out with clutch. Engine buzzes up but there's no load on anything. How does that break anything?
Reference item 8 isolator.
https://partsfinder.onlinemicrofiche...EEL%20-%20REAR
The rubber isolator in the rear sprocket protects the drive train on the big cruisers. As Harley grew their motor, they had no choice.
If their part was made from 4340 (nickel chromium molybdenum), it would be tough all the way thru.
I do like it that it appears to have a nice finish on the ramps. May be a little quieter at idle, least for a while.
BigT12, is your broken part magnetic? What happens when you miss a shift. I have done it a few times. Especially when I rode year round in the winter all bundled up. Didn't quite hit it hard enough and it failed to pull in when I came out with clutch. Engine buzzes up but there's no load on anything. How does that break anything?
Reference item 8 isolator.
https://partsfinder.onlinemicrofiche...EEL%20-%20REAR
Last edited by Jackie Paper; May 9, 2021 at 09:14 PM.
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,922
Likes: 8,027
From: poway
The original is not cast aluminum. It's either cast steel or forged steel.. I've seen a few. I'd expect it's heat treated also but maybe not..
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Ultimate HDF Member
Joined: Oct 2016
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From: On my bike!
Got me seriously considering this cyclerama piece. Since my 128 build my comp is a little noisy and Im making 138hp 150tq and I dont want the stock ramp to explode like some have been doing. Seems like a stronger ramp is all you need by my understanding, no need to replace the whole compensator correct?
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Joined: Feb 2009
Posts: 5,642
Likes: 1,985
From: Cleveland Zoo
Got me seriously considering this cyclerama piece. Since my 128 build my comp is a little noisy and Im making 138hp 150tq and I dont want the stock ramp to explode like some have been doing. Seems like a stronger ramp is all you need by my understanding, no need to replace the whole compensator correct?