Checking Crank run out
Outstanding HDF Member
Joined: May 2008
Posts: 2,543
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From: Ashland Ohio
Click HERE. Download and save. THEN you can watch the actual MOCO recommendations on HOW one is to check crank run out.... VIDEO!!!
This is the PDF of the Harley Bulletin on HOW to properly check crank run out. Proper crank run out is checked on BOTH SIDES and not just the cam plate side. My crank... when I pulled it out (09 SG with 18k), had .0045 on cam side and .008 on output side. MOCO says .012 is the limit... I call BS on that.....
THAT .008 would put my hands asleep after a few hours.
Having had a crank twist on on a stock bike... I STILL do NOT feel that it is a big problem as it would seem. Internet blows crap out of proportion quite a bit. 99 44/100% of folks will be fine. It is GOOD practice, though... when the cam chest is open... simply check. Easy to do.
NOW... my crank has .0005 runout, I have 20k on the new crank... and all is GOOD!!
This is the PDF of the Harley Bulletin on HOW to properly check crank run out. Proper crank run out is checked on BOTH SIDES and not just the cam plate side. My crank... when I pulled it out (09 SG with 18k), had .0045 on cam side and .008 on output side. MOCO says .012 is the limit... I call BS on that.....
THAT .008 would put my hands asleep after a few hours.
Having had a crank twist on on a stock bike... I STILL do NOT feel that it is a big problem as it would seem. Internet blows crap out of proportion quite a bit. 99 44/100% of folks will be fine. It is GOOD practice, though... when the cam chest is open... simply check. Easy to do.
NOW... my crank has .0005 runout, I have 20k on the new crank... and all is GOOD!!
Last edited by wurk_truk; Mar 23, 2011 at 11:47 PM.
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Very seldom are they as bad as the scare that has run rampant throughout these message boards.
The family of cranks that we witnessed with problems seemed to be the 03-05 units.
Saw an 04 once with about .023" on the pinion, and .042" on the sprocket side.
That was a rockin' 95"er we built him, in 05. He beat on that bike like a rented mule, and it finally showed up.
Very surprised it didn't rip the teeth off the gear drive set-up.
A 4 5/8" S&S crank, with an Axtell 4 1/8" cylinder kit fixed it.
Scott
Elite HDF Member
Joined: Nov 2010
Posts: 3,846
Likes: 173
From: Simi Valley, CA
Most cranks we see are in/around .002"-.0035", but these are mostly late model bikes.
Very seldom are they as bad as the scare that has run rampant throughout these message boards.
The family of cranks that we witnessed with problems seemed to be the 03-05 units.
Saw an 04 once with about .023" on the pinion, and .042" on the sprocket side.
That was a rockin' 95"er we built him, in 05. He beat on that bike like a rented mule, and it finally showed up.
Very surprised it didn't rip the teeth off the gear drive set-up.
A 4 5/8" S&S crank, with an Axtell 4 1/8" cylinder kit fixed it.
Scott
Very seldom are they as bad as the scare that has run rampant throughout these message boards.
The family of cranks that we witnessed with problems seemed to be the 03-05 units.
Saw an 04 once with about .023" on the pinion, and .042" on the sprocket side.
That was a rockin' 95"er we built him, in 05. He beat on that bike like a rented mule, and it finally showed up.
Very surprised it didn't rip the teeth off the gear drive set-up.
A 4 5/8" S&S crank, with an Axtell 4 1/8" cylinder kit fixed it.
Scott
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
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