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My bike makes a loud rattling noise when above 3500 RPM

  • Thread starter Thread starter andrewclaycomb
  • Start date Start date
A

andrewclaycomb

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My bike makes a loud rattling noise when above 3500 RPM. What do you think it is? It's done this for as long as I've owned it. It's clearly audible above my Vance & Hines 4-1.

EDIT: It's actually more of a buzzing sound.
 
Last edited:
How long?

How long?

The first question I can think of is.....how long have you owned it??:-s
 
About a year and a half, I've had a few different mechanics work on different things and none of them have ever thought to mention that it is a problem. Could it be valve clearance?
 
Use a hose in one ear as a listening tool, where is the noise coming from?
Excessive valve clearance is usually noticed at low RPM.
 
tkent02 said:
Put a spark plug in it and turn on the ignition.
Click to expand...

Forget about the spark plug, it will only give you another headache. Put your hose on the muffer area. Careful you dont burn it though. 8-[
If your engine has survived with that noise for 18 months, it's probably just a loose baffle!
 
Thats a really good idea. Shortly after I go the bike I changed the exhaust to a Vance and Hines 4-1.

Tomorrow I'll have to experiment.
 
You could be lean on the needle circuit. Is it a pinging or a rattle. If the sound is close together and consistent like metal ball bearings bouncing between two walls it is a ping and you need to raise the needle a half notch to a full notch.
 
I would say it's more of a buzz now that I think about it. I've noticed that if I'm quickly accelerating it doesn't happen as often. It's more of a slow acceleration noise. I shift right when I hear it, so maybe that's why I haven't had any problems.
 
I was thinking maybe headlight, dummy light panel, guages, or either hand controls maybe?

Cory
 
tkent02 said:
You shift at 3500 RPM?

Whhaaaattttttttttttttttt?
Click to expand...

I just got this thing running really well, and I'm afraid of braking something new.

I've also never gone WOT with it.

I have no idea where the sound is coming from. Tomorrow I'm going to ride around and try to figure it out. The other thing is it may only be happening under load. Not in neutral.
 
Alright I located the buzz. It's coming from the the locking cover that goes over the fuel cap. When I press down on it the buzzing stops. Any ideas on a way to stop it? Temporarily I'm thinking about putting a small hand towel/ shop rag underneath it.

This is starting to get really exciting because after a year and half of replacing parts on this thing, I'm starting to run out of problems with it.
 
Stick a small piece of foam backed insulation to the underside of the gas cap cover. Had the same thing on my old 79 750. :-)

Earl

andrewclaycomb said:
Alright I located the buzz. It's coming from the the locking cover that goes over the fuel cap. When I press down on it the buzzing stops. Any ideas on a way to stop it? Temporarily I'm thinking about putting a small hand towel/ shop rag underneath it.

This is starting to get really exciting because after a year and half of replacing parts on this thing, I'm starting to run out of problems with it.
Click to expand...
 
+1 on the piece of foam, then go out and open up the throttle and run it up to red line a few times, preventive maintenance.
 
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