Motor mount question
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Tourer
Joined: May 2021
Posts: 279
Likes: 401
From: Reading Pennsylvania
Motor mount question 2017 Street Bob
I’m not sure how to tell if my rubber motor isolators are bad since this is my first Dyna. 2017 Street Bob with 13,000 miles. While riding it’s smooth but when slowing to a stop it feels like the motor is rocking pretty good. No handling problems it corners like a champ. I’ve seen other rubber mounted engines idling that looked like it was going to jump out of the frame; mine moves while idling but not that bad so I’m not sure where I stand with this. Any advice would be appreciated.
Last edited by Volkspanzer; May 27, 2026 at 03:36 PM.
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Tourer
Joined: May 2021
Posts: 279
Likes: 401
From: Reading Pennsylvania
So is the front mount usually the first one to need replacing? I haven’t had a chance to check em out yet but since there’s no handling issues is the front mount the usual suspect?
Stellar HDF Member
Joined: Aug 2019
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From: Unreconstructed
Like @Bubba Zanetti said, get down and look at it. Is it covered in oil, grease and crap? Non-cautious owners will not take good care of that area and that is a prime, hard to clean area where oil gets dumped during an oil change. The oil buildup will have a negative effect on the rubber over time as will, sun, heat, humidity. Has it been stored inside, or has it been outside in the sun, rain, etc.? If it were my bike, at 10years and 13k miles I'd replace the front and back mounts and align the engine. It's not hard to do if you have the right tools.
HDF Community Team
Joined: Aug 2018
Posts: 3,066
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From: New Hampsha
I'm sure there are photos posted in some of the older threads on the subject, but, the front mount has a domed spot on the top center of the rubber portion and if it is touching the metal "T" shaped bracket that bolts to the engine then the front mount is collapsed.
A collapsed front mount shifts the powertrain aft and stresses the rear mount. If it isn't new you are probably better off to replace it as well.
A collapsed front mount shifts the powertrain aft and stresses the rear mount. If it isn't new you are probably better off to replace it as well.
Last edited by John CC; May 28, 2026 at 12:06 PM.
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From: Unreconstructed
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Tourer
Joined: May 2021
Posts: 279
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From: Reading Pennsylvania
I’ll go take a better look at it I wasn’t sure what he meant by the domed area. I’ll clean it up too lol.
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