Bang, knock - Help
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Road Warrior
Joined: Aug 2015
Posts: 1,712
Likes: 410
From: Puyallup, WA
Bang, knock - Help
My winter mods stretched into spring, but got my '06 Fatboy back together. Put about 400 miles on it since wheels powder coated, etc.. I checked cam chain tensioners, pretty good; both front and rear. I did a Full 10k service, I used to wrench/race. (Bought it last July with 6k on the clock).
Riding back from work Saturday. I could hear a slight wurring sound. Then every once in a while a slight tap. Sounded like a leather strap hitting a fender. On Sunday after screwing it on in the twisties, I now have a bang, not consistent though.
So, no bang in neutral. No banging with clutch disengaged nor in gear while stopped. No bang on start up. No banging when holding front brake and letting clutch out in gear. So doesn't seem like a compensator. No bang when first taking off from a stop, just an occasional banging when cruising. Definitely getting worse. Pulled primary plug, clean. Primary chain and drive belt checked and good for tension. Engine revs fine, sounds good. Bang/klank only when moving.
Best way to describe sound would what a primary chain with a broken link would sound like when hitting the primary case. Although while riding, sounds like noise is coming from directly under the tank, hard to track down.
I'll pull the primary case tomorrow. Inner primary bearing? Ideas?
Thanks
Riding back from work Saturday. I could hear a slight wurring sound. Then every once in a while a slight tap. Sounded like a leather strap hitting a fender. On Sunday after screwing it on in the twisties, I now have a bang, not consistent though.
So, no bang in neutral. No banging with clutch disengaged nor in gear while stopped. No bang on start up. No banging when holding front brake and letting clutch out in gear. So doesn't seem like a compensator. No bang when first taking off from a stop, just an occasional banging when cruising. Definitely getting worse. Pulled primary plug, clean. Primary chain and drive belt checked and good for tension. Engine revs fine, sounds good. Bang/klank only when moving.
Best way to describe sound would what a primary chain with a broken link would sound like when hitting the primary case. Although while riding, sounds like noise is coming from directly under the tank, hard to track down.
I'll pull the primary case tomorrow. Inner primary bearing? Ideas?
Thanks
HDF Community Team
Joined: Jun 2006
Posts: 12,780
Likes: 2,609
From: san antonio
From your description it doesn't sound like compensator, inner primary bearing, clutch, etc. The fact that the bang occurs intermittently and only when moving and the fact that your wheels were remove and reinstalled would cause me to be looking for a rear wheel bolt that may be backing out and hitting the swing arm or something at the rear end of the bike.
When something like this occurs, I always revert to the last thing that was done to the motorcycle for the source of the problem. It sounds like the wheels and the 10K mile service were the last things done to the motorcycle so that is where I would naturally start. If the problem was related to the 10K mile service, I believe the problem would have presented before you rolled up 400 miles. That would have me looking at the wheels.
When something like this occurs, I always revert to the last thing that was done to the motorcycle for the source of the problem. It sounds like the wheels and the 10K mile service were the last things done to the motorcycle so that is where I would naturally start. If the problem was related to the 10K mile service, I believe the problem would have presented before you rolled up 400 miles. That would have me looking at the wheels.
Thread Starter
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Road Warrior
Joined: Aug 2015
Posts: 1,712
Likes: 410
From: Puyallup, WA
From your description it doesn't sound like compensator, inner primary bearing, clutch, etc. The fact that the bang occurs intermittently and only when moving and the fact that your wheels were remove and reinstalled would cause me to be looking for a rear wheel bolt that may be backing out and hitting the swing arm or something at the rear end of the bike.
When something like this occurs, I always revert to the last thing that was done to the motorcycle for the source of the problem. It sounds like the wheels and the 10K mile service were the last things done to the motorcycle so that is where I would naturally start. If the problem was related to the 10K mile service, I believe the problem would have presented before you rolled up 400 miles. That would have me looking at the wheels.
When something like this occurs, I always revert to the last thing that was done to the motorcycle for the source of the problem. It sounds like the wheels and the 10K mile service were the last things done to the motorcycle so that is where I would naturally start. If the problem was related to the 10K mile service, I believe the problem would have presented before you rolled up 400 miles. That would have me looking at the wheels.
I'll keep working on it. Thanks for your reply.
Road Captain
Joined: Jan 2014
Posts: 566
Likes: 70
From: The Redneck Riviera
Excellent advise from you, as usual. Thanks. My first guess was the new chrome bolts I used on the rare pulley. Checked them - they're good. I could still see my mark where you tighten them an extra 1/8 of a turn. On my way back I coasted down a hill, no noise.
I'll keep working on it. Thanks for your reply.
I'll keep working on it. Thanks for your reply.
Thread Starter
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Road Warrior
Joined: Aug 2015
Posts: 1,712
Likes: 410
From: Puyallup, WA
Ding, ding, ding.....we have a winner... djl please come to winners counter. Put primary back together, without really finding anything. The bang is gone, (prolly loose chain), but that tap was still there. Pulled front wheel - bad bearing.
Thanks for everyone's input
Thanks for everyone's input
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