Rear chain scraping against inner primary
Thread Starter
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1st Gear
Joined: May 2017
Posts: 5
Likes: 1
From: BC Canada
Rear chain scraping against inner primary
I bought a 1981 Dyna Superglide Fatbob FXEF as a project. It came completely disassembled (empty frame) and in pieces. I have the build almost completed but after installing the rear tire and giving it a spin, as soon as the chain master link engages the transmission output shaft, the chain itself grinds against the back of the inner primary case. There are literally aluminum shavings on the floor. New chain installed with the Motion Pro kit, and new inner primary. When I installed the inner primary, i left the transmission loose on the frame so it could be drawn into the inner primary housing so it wouldn't crack. The chain is straight between rear tire and transmission when adjusted to length so I'm thinking that the sprocket on the xmsn output shaft is sitting too close to the inner primary housing. There is a gap created between the starter drive gear housing and the primary casing itself. I think the chain should reside in the centre of that gap. When I look down the chain from the rear tire, the chain sits extremely close to the inner primary. When the transmission was on the bench, I made sure everything was tight, and operating properly. The trans mounted like it should on the frame, all bolt holes lined up perfectly. Was there a difference in transmissions for different models? Can anyone help?
Road Master
Joined: Oct 2017
Posts: 815
Likes: 292
From: Uptown Bay Area, Cali
I bought a 1981 Dyna Superglide Fatbob FXEF as a project. It came completely disassembled (empty frame) and in pieces. I have the build almost completed but after installing the rear tire and giving it a spin, as soon as the chain master link engages the transmission output shaft, the chain itself grinds against the back of the inner primary case. There are literally aluminum shavings on the floor. New chain installed with the Motion Pro kit, and new inner primary. When I installed the inner primary, i left the transmission loose on the frame so it could be drawn into the inner primary housing so it wouldn't crack. The chain is straight between rear tire and transmission when adjusted to length so I'm thinking that the sprocket on the xmsn output shaft is sitting too close to the inner primary housing. There is a gap created between the starter drive gear housing and the primary casing itself. I think the chain should reside in the centre of that gap. When I look down the chain from the rear tire, the chain sits extremely close to the inner primary. When the transmission was on the bench, I made sure everything was tight, and operating properly. The trans mounted like it should on the frame, all bolt holes lined up perfectly. Was there a difference in transmissions for different models? Can anyone help?
Now that's out of the way, lol, it sounds like you need a spacer on the inside of the sprocket. J&P Cycle part number 6200001 is 0.085". Some year sprockets came with that, but seeing you assembled a basket, who knows. Show us a pic of your ride!
Dave
Last edited by TOE_CUTTER; Oct 21, 2019 at 02:03 AM.
Stellar HDF Member
Joined: Feb 2013
Posts: 3,072
Likes: 1,727
From: Dallas, Texas
Good news for o ring chain - stays lubed thanks to o rings. Bad news is o ring chains are wider than standard chains. I would venture to say put a regular chain on it and the problem will be gone.
Road Master
Joined: Jun 2017
Posts: 1,071
Likes: 561
From: Kerrville, Texas
did you use a clip style master link?
you can flip the clip to the inside and see if it clears that way just be sure to put the clip with the open end towards the rear
you can flip the clip to the inside and see if it clears that way just be sure to put the clip with the open end towards the rear
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HDF Community Team
Joined: Aug 2018
Posts: 3,075
Likes: 1,232
From: New Hampsha
Well, half the time, anyhow! 
Closed end points in the direction the chain moves. On top the open end points aft, but on the bottom it points forward.
Closed end points in the direction the chain moves. On top the open end points aft, but on the bottom it points forward.
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Thread Starter
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1st Gear
Joined: May 2017
Posts: 5
Likes: 1
From: BC Canada
Maaaaan, i tried for about 2 hours yesterday to remove that master link without destroying it, just to reverse the darn thing. When i couldn't remove it, that's when i looked down the length of the chain and noticed that it sits about 1" (approx) from the transmission and about 1/8" from the back of the inner primary and said to myself... nah, something's not right here. But I didn't, in the slightest, think the o-ring chain was wider than the OEM one, although it makes total sense. I'll get out my vernier today and take some measurements, but i'm sure that's the issue. VERY much appreciate the feedback... thank you all.