HD Inherent catastrophic design flaws
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Road Master
Joined: Feb 2014
Posts: 1,079
Likes: 376
From: Queanbeyan, Australia
HD Inherent catastrophic design flaws
Posted under another heading but this one captures the issue better.
Saw a video on youtube claiming there were some inherent defects in the design of modern HD motors. One thing the narrator said was that the pressed flywheels were inherently badly designed and were likely to cause vibration after many miles and also cause catastrophic engine failure after wearing the bearings.
Any truth too this? - or is it just a beat up? Thoughts welcome - especially from those who have put on a few miles... Are we really sitting on ticking time bombs awaiting catastrophic engine failure as the video suggests?
Youtube video title is: HARLEY TWIN CAM ENGINE DESIGN PROBLEMS
Saw a video on youtube claiming there were some inherent defects in the design of modern HD motors. One thing the narrator said was that the pressed flywheels were inherently badly designed and were likely to cause vibration after many miles and also cause catastrophic engine failure after wearing the bearings.
Any truth too this? - or is it just a beat up? Thoughts welcome - especially from those who have put on a few miles... Are we really sitting on ticking time bombs awaiting catastrophic engine failure as the video suggests?
Youtube video title is: HARLEY TWIN CAM ENGINE DESIGN PROBLEMS
Road Warrior
Joined: May 2010
Posts: 1,593
Likes: 11
From: Mass/NH
Relax. These are all "features"...lol.
Per an HD mechanic I trust, never use 6th gear under 65, too much stress on the crank. Keep an eye on your cam and primary shoes, and you are good to go.
Ride safe.
Per an HD mechanic I trust, never use 6th gear under 65, too much stress on the crank. Keep an eye on your cam and primary shoes, and you are good to go.
Ride safe.
Sponsor
Joined: Jul 2015
Posts: 8,538
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From: SF Bay area
The guy in the video is right.... at 0.3" run out on the crank you're gonna have problems.
Wonder if he has a video series available...
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For ROCKOUT information & purchasing please click the LINKS below...
Wonder if he has a video series available...
__________________________________________________ ____
For ROCKOUT information & purchasing please click the LINKS below...
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NO, they DON'T all do that!
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Also on amazon.com...
Imitated, never equaled... ROCKOUTS!
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Road Master
Joined: Feb 2014
Posts: 1,079
Likes: 376
From: Queanbeyan, Australia
Pardon my ignorance
The guy in the video is right.... at 0.3" run out on the crank you're gonna have problems.
Wonder if he has a video series available...
__________________________________________________ ____
For ROCKOUT information & purchasing please click the LINKS below...
Wonder if he has a video series available...
__________________________________________________ ____
For ROCKOUT information & purchasing please click the LINKS below...
Stellar HDF Member
Joined: Dec 2005
Posts: 3,302
Likes: 274
From: Milton, Delaware
Runout is the 'wobble' that a crankshaft has when it is not perfectly true (straight). There is a tolerance that HD says is acceptable, check your service manual for your particular bike.
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Road Master
Joined: Feb 2014
Posts: 1,079
Likes: 376
From: Queanbeyan, Australia
Thanks
Runout is the 'wobble' that a crankshaft has when it is not perfectly true (straight). There is a tolerance that HD says is acceptable, check your service manual for your particular bike.
2010 Crank Runout - YouTube
HOW TO MEASURE CRANK RUNOUT ON A HARLEY TWIN CAM - YouTube
2010 Crank Runout - YouTube
HOW TO MEASURE CRANK RUNOUT ON A HARLEY TWIN CAM - YouTube
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Road Warrior
Joined: Aug 2007
Posts: 1,392
Likes: 43
From: South Australia
The guy in the video is right.... at 0.3" run out on the crank you're gonna have problems.
Wonder if he has a video series available...
__________________________________________________ ____
For ROCKOUT information & purchasing please click the LINKS below...
Wonder if he has a video series available...
__________________________________________________ ____
For ROCKOUT information & purchasing please click the LINKS below...
he actually said 0.3 thousandths so he's sort of right, he should have just said 3 thousandths without the zero point
but yeah, he is still a tool..... lol
according to him my oil pump is driven by the outer chain..... er I'm pretty sure its driven by the crank pinion shaft....
Last edited by Tat2u; Apr 21, 2016 at 03:35 AM.
Seasoned HDF Member
Joined: Aug 2011
Posts: 11,814
Likes: 5,120
From: SW Ohio
It is run off the pinion shaft, not a chain.