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Author Topic: Swapping rear disc between final drives  (Read 4577 times)

Offline Motorhobo

  • +25 years of K75
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Swapping rear disc between final drives
« on: March 26, 2015, 09:50:30 AM »
I need to move the ABS disc from one FD to another. I know getting the discs of front wheels is a bear but I seem to remember that they come off off the rear wheel pretty easily. Can someone tell me whether an impact wrench is recommended here and what kind of loctite is on there or whether heat is required to get it off? I only see two countersunk hex shallow-socket screws on there.

Any help appreciated -- never done this before.

MH
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1994/1995 K75 ABS Frankenbike: original engine 136k miles, frame from Gary Weaver (RIP), 173k miles -- Current Odometer: 198k miles
1994 K75 since 2013, 82,000 mi (19k mine) w/California Sidecar Friendship II Sidecar & Black Lab 'Miss B' - RIP

Past: 1974 Honda 550/4 (first bike), 1994 K75 (sold), 1995 K75 ABS (parts bike), Sidecar Dog & Best Bud 'Bo' - RIP

Offline The Mighty Gryphon

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Re: Swapping rear disc between final drives
« Reply #1 on: March 26, 2015, 10:45:21 AM »
I had to hit those flat head screws with MAPP gas to get the damn red Loctite to let go.  I don't really understand the Loctite there.  The wheel bolts seem to be doing the job of holding the disc in place when everything is put together.  Those screws just keep the disc from falling off when the wheel is off the bike.

Otherwise not a bad job.
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  • In my garage in Marilla, NY
  • '91K100RS White/Blue
Current:
'91 K100RS16V "Moby Brick Too"

Past:
'94 K75RT "Ilsa, She Wolf of the SS"
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline Motorhobo

  • +25 years of K75
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Re: Swapping rear disc between final drives
« Reply #2 on: March 26, 2015, 03:59:53 PM »
Did you make some kind of jig for it on the bench or just leave it connected to the swingarm? That can't be fun if it's just hanging there on the swingarm...
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1994/1995 K75 ABS Frankenbike: original engine 136k miles, frame from Gary Weaver (RIP), 173k miles -- Current Odometer: 198k miles
1994 K75 since 2013, 82,000 mi (19k mine) w/California Sidecar Friendship II Sidecar & Black Lab 'Miss B' - RIP

Past: 1974 Honda 550/4 (first bike), 1994 K75 (sold), 1995 K75 ABS (parts bike), Sidecar Dog & Best Bud 'Bo' - RIP

Offline The Mighty Gryphon

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Re: Swapping rear disc between final drives
« Reply #3 on: March 26, 2015, 04:12:48 PM »
As I recall, I did it with the final drive on the bench.  I was pulling the disc to change the drive shaft oil seal.  I don't think it would be that much harder to get the screws out on the swingarm.  Locking the rear brake might actually make loosening the screws easier. 

Re, the torch.  Only took 10-15 seconds to loosen things up.
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  • In my garage in Marilla, NY
  • '91K100RS White/Blue
Current:
'91 K100RS16V "Moby Brick Too"

Past:
'94 K75RT "Ilsa, She Wolf of the SS"
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline billday

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Re: Swapping rear disc between final drives
« Reply #4 on: March 26, 2015, 09:35:27 PM »
Do it with the FD attached to the swingarm. It's not hard, just be firm.
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  • New York State, USA 10977
  • 1985 K100

Offline The Mighty Gryphon

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Re: Swapping rear disc between final drives
« Reply #5 on: March 26, 2015, 11:33:40 PM »
Quote from: billday on March 26, 2015, 09:35:27 PM
Do it with the FD attached to the swingarm. It's not hard, just be firm.

+1 I just put a stack of 2x8's under the final drive when I have to take the wheel off and mess with things back there.
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  • In my garage in Marilla, NY
  • '91K100RS White/Blue
Current:
'91 K100RS16V "Moby Brick Too"

Past:
'94 K75RT "Ilsa, She Wolf of the SS"
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline billday

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  • Posts: 1341
Re: Swapping rear disc between final drives
« Reply #6 on: March 27, 2015, 07:48:15 AM »
Quote from: The Mighty Gryphon on March 26, 2015, 11:33:40 PM
Quote from: billday on March 26, 2015, 09:35:27 PM
Do it with the FD attached to the swingarm. It's not hard, just be firm.

+1 I just put a stack of 2x8's under the final drive when I have to take the wheel off and mess with things back there.

Yes -- whenever you take off the rear shock, do not allow the swingarm to drop freely, and be sure it's supported. That protects the rubber boot that protects the front end of the drive shaft.

I have a "T" made of 2x4 for the purpose.
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  • New York State, USA 10977
  • 1985 K100
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