Belt Drive Tension - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 15 (permalink) Old 04-28-2019, 06:06 PM Thread Starter
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Belt Drive Tension

This is my first belt driven motorcycle, it seems to generate belt noise. I believe it is adjusted correctly. Manual says 4 to 6 MM slack. The marks you see on the belt cover are 5 MM apart. Does this look OK to you guys that are more familiar with belt drives?


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post #2 of 15 (permalink) Old 04-28-2019, 06:26 PM
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What kind of noise is belt noise. Squealing?
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post #3 of 15 (permalink) Old 04-28-2019, 06:54 PM Thread Starter
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What kind of noise is belt noise. Squealing?
No squealing, no slipping, more like a hum. It may be completely normal. I don't know.

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post #4 of 15 (permalink) Old 04-28-2019, 06:58 PM
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I get kind of a howl on my bike at lower speeds but I always figured it was tranny noise. Maybe it is belt noise. I did look at belt and it is pretty tight.. Maybe we should loosen the belt up a bit and see what happens.
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post #5 of 15 (permalink) Old 04-28-2019, 07:55 PM
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Which bike? I only have experience with the V-Star 950. If that is what you have your belt is too tight. Manual says 5MM, but accepted norm is 7-10MM. Too tight will tear up the rear pulley bearing. The only noise I ever heard from mine was a squeak (loud) after the front pulley was loose and damaged the belt.
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post #6 of 15 (permalink) Old 04-29-2019, 05:54 AM
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Quote:
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Quote:
Originally Posted by sdunker View Post
What kind of noise is belt noise. Squealing?
No squealing, no slipping, more like a hum. It may be completely normal. I don't know.
Well, first off Rob you can’t go wrong if you’re doing it to manual specs. I’ve noticed a “hum” out of mine, but only seems to be at certain speeds. I don’t see any wear occurring either.
Stupid question here, but is your belt “tracking” correctly? Not pulling to the inside or outside?
Also, how’s your rear tire look? I’ve had “hum” before from the side edges of the tire being less worn than the center.
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Last edited by ChiefGunner; 04-29-2019 at 06:01 AM.
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post #7 of 15 (permalink) Old 04-29-2019, 06:43 AM Thread Starter
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Well, first off Rob you can’t go wrong if you’re doing it to manual specs. I’ve noticed a “hum” out of mine, but only seems to be at certain speeds. I don’t see any wear occurring either.
Stupid question here, but is your belt “tracking” correctly? Not pulling to the inside or outside?
Also, how’s your rear tire look? I’ve had “hum” before from the side edges of the tire being less worn than the center.
Belt looks good, tire is new CT. Tracks and runs great. Mine seems to be noisy at certain speeds also. Belt tracks good, no wear. I may loosen it slightly to see if it makes a difference. It is probably normal noise for a belt drive, I just don't know any better.

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post #8 of 15 (permalink) Old 07-13-2019, 09:15 PM
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--

I just got back from a 9,000 mile trip. Bike now has 22,000 miles. For the entire life of the bike I have heard a kind of squeal. I used to think it was the front rotor as my Road Star was noisy there. Then I thought maybe something in the engine, but varying the engine speed doesn't change the sound. It's not always constant or the same loudness. I thought maybe some bearings were dry as it kind of sounds like that kind of hollow squeal. I now suspect it's the belt although it isn't so constant I can make it happen at any given speed, although at high speeds you can't hear that well.

Has anyone changed the tension of their belt yet to see if that quiets down any noise?

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post #9 of 15 (permalink) Old 07-13-2019, 10:38 PM Thread Starter
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--

I just got back from a 9,000 mile trip. Bike now has 22,000 miles. For the entire life of the bike I have heard a kind of squeal. I used to think it was the front rotor as my Road Star was noisy there. Then I thought maybe something in the engine, but varying the engine speed doesn't change the sound. It's not always constant or the same loudness. I thought maybe some bearings were dry as it kind of sounds like that kind of hollow squeal. I now suspect it's the belt although it isn't so constant I can make it happen at any given speed, although at high speeds you can't hear that well.

Has anyone changed the tension of their belt yet to see if that quiets down any noise?

--
I have...made a tremendous difference. I loosened mine to the max of 7mm travel and it is a lot quieter. I still hear it but it is better. This is one of the things I think Yamaha missed on. It should be shaft drive. I have 21k on mine and loosened it at 14k, should have done it at the dealership when I picked it up.
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post #10 of 15 (permalink) Old 07-14-2019, 06:34 AM
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I was getting a loud howl at certain speeds. I checked belt with rear tire off the ground. The tightest spot had only 3mm of slack. Yamaha says 5-7mm of slack at tightest point. I played with the belt slack for a couple of days and ended up at 10mm of slack at tightest spot. I also found out that the marks on the side of the swingarm arn't exactly perfect. My belt would run to the outside of both the front and rear pulley and I knew this wasn't correct. I took cowpuc's advise and spun tire and adjusted till belt was running in center. When I got done it makes very little noise, I think all I hear now is tire noise.
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