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Strange sound

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Old May 20, 2017 | 11:41 AM
  #1  
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Default Strange sound

When I hit a pot hole or a bump on road , it sounds like my tank or something is loose . I've heard it numerous of time . Have any of you guys encountered this problem, where should I start ?
 
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Old May 20, 2017 | 12:18 PM
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Gee, maybe start with the tank. Make sure the bolts are torqued down. If that cures it, go no further.
If not, check the front engine mount.
 
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Old May 20, 2017 | 12:29 PM
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I recently did the tank lift and used Loc tight on bolts and torqued them down to specs . But I heard that noise last season also . I'll try the motor mount , and triple trees . Any one know where I can find torque specs and I'll just check everything that I can ,
 
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Old May 20, 2017 | 12:39 PM
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It can't hurt to double check the tank bolts. Also the heat shields.
A bad motor mount should be obvious, but if you can't see that the rubber is trashed, get a pry bar between the frame and motor and see if there's a lot of movement.
Torque specs are in the shop manual, but here are some:
http://www.nightrider.com/biketech/hdtorquevalues.htm
 
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Old May 20, 2017 | 01:12 PM
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Have a look at the connectors and such under the tank, one of those might be bouncing and ringing off the bottom of the tank ... a simple tie-wrap might fix.
 
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Old May 20, 2017 | 02:54 PM
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Check heat shields and make sure your steering neck is adjusted for the proper fall-away. When the tree gets loose, it can 'thump' once in awhile.
 
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Old May 20, 2017 | 03:04 PM
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I did a tank lift. Developed a rattle months later Front tank bolts were tight. Needed to be even tighter
 
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Old May 20, 2017 | 04:18 PM
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Just my opinion, do the fall away check, and I think the clunk will go away, lots of Fatbobs had this, and another thing was the tube in the front forks with the springs needs to be 1 cm longer.
 
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Old May 20, 2017 | 08:47 PM
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Ok , I've got the bike in the air . Checked for freeplay in the steer stem seems fine but wouldn't hurt to replace since the bike is 8+ yrs old ( 3200 miles ) . More concerned about the age and not the miles . Torque on motor mount is fine also , I noticed the shifter seems to be very loose side to side . Is this normal ?
 
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Old May 20, 2017 | 08:54 PM
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Originally Posted by nevil
It can't hurt to double check the tank bolts. Also the heat shields.
A bad motor mount should be obvious, but if you can't see that the rubber is trashed, get a pry bar between the frame and motor and see if there's a lot of movement.
Torque specs are in the shop manual, but here are some:
http://www.nightrider.com/biketech/hdtorquevalues.htm
Just tested the motor mount with pry bar , looks like that just might be my problem. How much movement should I have if any ?
 

Last edited by Proline1969; May 20, 2017 at 09:16 PM.
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