FXR Front Motor Mount Torque
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Road Master
Joined: Jul 2008
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From: In the mountains
FXR Front Motor Mount Torque
The long center bolt for the front motor mount has a torque spec of 35-45 ft. lbs according to the service manual. Guys are saying they use as low as 10 ft. lbs. and high as 80 ft. lbs. What are you all torquing to? I have a vibration, have ensured that center bolt isn't binding, but not sure about tq specs.
As near as I can tell, this is one of those "black magic" type questions.
Some guys run them tight. Some run them loose...so loose that use a jam nut to keep the nut on.
I replaced mine a while back, and the personality of the vibrations changed with it. There is a resonance right at 1200 or so. I knocked my idle down a smidge so it's not shaking as much at idle.
I played around with the torque, and ended up deciding to run it on the loose side. Seems to work best for me.
But I think this largely is a function of the particulars of your specific mount, your engine, etc. I think you just have to find the torque that works for you.
Some guys run them tight. Some run them loose...so loose that use a jam nut to keep the nut on.
I replaced mine a while back, and the personality of the vibrations changed with it. There is a resonance right at 1200 or so. I knocked my idle down a smidge so it's not shaking as much at idle.
I played around with the torque, and ended up deciding to run it on the loose side. Seems to work best for me.
But I think this largely is a function of the particulars of your specific mount, your engine, etc. I think you just have to find the torque that works for you.
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