Front Motor Mount Replacement

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Sep 9, 2018 | 06:24 PM

fshaw

Thread Starter

Cruiser

Joined: Sep 2017

Posts: 156

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From: Adirondacks

Front Motor Mount Replacement

I just replaced the front motor mount on my 1990 FLHS with a Biker's Choice motor mount from J&P. It now has an obnoxious vibration. I didn't tighten any of the motor mount bolts until I had the front stabilizer tightened. I then tightened the remaining bolts. The vibration is worse at low RPMs and makes the bag lids rattle at idle. I'm ready to put the old mount back in.

Does the mount need to "run in" or is it a poor choice in mounts? I cant see where I have anything mis aligned as that is set by the front stabilizer. I installed the new mount tapered side up like the original that came out.

I'm sure this has been covered before and did search for a while, couldn't find anything helpful.

Thanks in advance.

Frank

Sep 9, 2018 | 06:41 PM

daven9113

Road Master

Joined: Aug 2007

Posts: 942

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From: Grew up in Texas, moved to AZ

There is a little break-in time, and it should smooth out. As a good practice, you should put the motor mount on with bolt and nut loose. Start the bike and get it settled in, and then tighten it down. I'm sure it will settle out after some riding.

Sep 9, 2018 | 07:29 PM

fshaw

Thread Starter

Cruiser

Joined: Sep 2017

Posts: 156

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From: Adirondacks

Hoping so, pretty gruesome right now.

Thanks.

Frank

Sep 9, 2018 | 08:19 PM

Racepres

Seasoned HDF Member

Joined: Jul 2014

Posts: 8,607

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From: Cental, MI

Last I knew, the MoCo still offered that mount... but it's been awhile.
Gotta be better than Chiwanese tho..

Sep 9, 2018 | 09:09 PM

fshaw

Thread Starter

Cruiser

Joined: Sep 2017

Posts: 156

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From: Adirondacks

I’d be willing to bet that the MoCo part comes from China as well. A fair amount of their parts do.

Sep 9, 2018 | 09:24 PM

Schex

Club Member

Joined: Apr 2011

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From: SE Louisiana

If you cranked down on the center bolt, back off the nut until you can turn the bolt with some drag on it, you can double nut it if's there's room.

Sep 10, 2018 | 04:00 AM

Yankee Dog

Grand HDF Member

Joined: Apr 2007

Posts: 3,727

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From: Brighton, MI

Is there an "settle in" procedure like on my dyna after replacement? I know the manual for mine says leave the new mounts loose, run the engine for x amount of time at idle, then torque things down...etc. Worth checking if such procedure exists for your bike. It might help. Alignment procedure also??? YD