Sheared Off Rear Pulley Bolts
Tourer
Joined: Sep 2010
Posts: 459
Likes: 2
From: wa
I am in agreement w/ dynabobbster...
I've pondered this one a lot...why is the counter-bore a generous clearance hole. This condition also exists @ the upper shock bolt (I've sheared this one once). The support solution for each would be a sleeve sized correctly.
Specific to sheared pulley bolts, I'm in the camp that riding style likely plays a part. Throwing big shifts, and even more importantly, blowing big downshifts puts a lot of force on the pulley. This is the stuff that can scissor cranks, too.
I've pondered this one a lot...why is the counter-bore a generous clearance hole. This condition also exists @ the upper shock bolt (I've sheared this one once). The support solution for each would be a sleeve sized correctly.
Specific to sheared pulley bolts, I'm in the camp that riding style likely plays a part. Throwing big shifts, and even more importantly, blowing big downshifts puts a lot of force on the pulley. This is the stuff that can scissor cranks, too.
Elite HDF Member
Joined: Apr 2010
Posts: 4,990
Likes: 9
From: Marina del Rey
Sorry if I'm not expressing it well. It would seem that a true shoulder bolt (whose shoulder was larger than the threads) would be a better option, fitted closely so that all shear forces were taken by the shoulder, and such that the bottom of the shoulder always cleared the bottom of the counterbore.
You must learn to downshift at the right time and synchronize your downshifts with blipping the throttle so you don't wear your tires prematurely or worse. You're WAY over-stressing your whole driveline.
You must learn to downshift at the right time and synchronize your downshifts with blipping the throttle so you don't wear your tires prematurely or worse. You're WAY over-stressing your whole driveline.
Last edited by lo-rider; Jul 15, 2012 at 10:37 PM.
Tourer
Joined: May 2009
Posts: 310
Likes: 0
From: Des Moines, IA
Sorry if I'm not expressing it well. It would seem that a true shoulder bolt (whose shoulder was larger than the threads) would be a better option, fitted closely so that all shear forces were taken by the shoulder, and such that the bottom of the shoulder always cleared the bottom of the counterbore.
Elite HDF Member
Joined: Jun 2007
Posts: 4,867
Likes: 268
From: People's Republic of Boulder Colorado
Just wondering. Has this issue been addressed/fixed on the new (2012) bikes?
Thinking about getting a new FXDC, but I'm not gonna shell out the $$$ for a bike with a known defect.
Thanks in advance for any info.
Thinking about getting a new FXDC, but I'm not gonna shell out the $$$ for a bike with a known defect.
Thanks in advance for any info.
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Elite HDF Member
Joined: Jun 2007
Posts: 4,867
Likes: 268
From: People's Republic of Boulder Colorado
So just to be clear, if I buy a new FXDC and leave it factory-stock this issue shouldn't be a problem?
Thanks for the clarification and info.