Another yamaha vmax 700 belt squeal issue??

J

jenfred10

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We have been looking into the belt squeal issue that some people have had.
What makes are issue different is it just started all the sudden??

We put a new belt on at the beginning of the season with no issues, no track movement at idle,no squealing.
All the sudden at start up today out of the blue the track was spinning. My husband put a couple miles on it and the belt kept squealing at idle and the spool area of the primary is getting blue.
We just dont get why its doing it all the sudden? The secondary is right where it has been the whole time with the belt slightly above flush.
 
Does it only do it at idle?? what belt and brand? If so Here is what i think. Belt has broken in some and has a little more grip now to say causing it to squeal. Have you taken the secondary off. Take the 3 bolts out remove a washer on each bolt. It will open that clutch a little more. I dont get all caught up in the my belt has to be1/8 inch above. If it is a little below not that big of a deal.
 
mes882 said:
Does it only do it at idle?? what belt and brand? If so Here is what i think. Belt has broken in some and has a little more grip now to say causing it to squeal. Have you taken the secondary off. Take the 3 bolts out remove a washer on each bolt. It will open that clutch a little more. I dont get all caught up in the my belt has to be1/8 inch above. If it is a little below not that big of a deal.
Click to expand...

Yes ,only at idle and just starting doing it. Haven't had the secondary off yet, but the belt does sit above a bit. We will check it out tomorrow and see how it goes. Forgot to mention its a Yamaha factory belt. Can't remember the part number but its the propper one for the sled.
 
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There are 3 small bolts on the back of the secondary, they should have washers on them, if they do remove the washers and turn the bolts back in. This will spread the secondary apart and drop the belt down a bit. If that still doesn't fix your problem you may need to replace those 3 bolts, the tips of them tend to get worn down with age.
 
Yep same thing happen to me last year with new belt at idle. Took off washers as shaggyzr2 said and problem solved.
 
Thanks every one! We were just worried because it started doing it all the sudden. The belt has around 30 miles on it and nothing was changed.
My husband messed with it a little tonight, he didn't adjust the secondary yet, but he said he pushed the spring in to loosen the belt and it seems to be sticking? He started it for a few minutes and everything was great until he gave it throttle to spin the track. After that the belt went back to the original position.
When the secondary is pushed in to release the belt, when you let go it should spring back and tighten back up on the belt shouldn't it?
Sorry if that's a dumb question, we know nothing about sled clutches.

Before I forget, I wanted to mention, as soon as the belt started catching it didn't want to take the throttle and would bog a bit. If you guys don't think there is another issue, I will have my husband go ahead and adjust the secondary...... Like I said ,just thought it was weird being all the sudden. The 3 bolts on the back look like new and never touched also.
 
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The clutches are sticking. They need to come apart and get cleaned. Build up of belt dust causes this.
 
When you push the clutch open the belt falls down some in the secondary. So it puts pressure on the belt. So no the clutch will not close fully but it should push up tight against the lowest point of the belt. Once you get the clutch spinning again belt should run up and down then the belt should be back to the top when you come to a stop. Yes when you first move the sled after opening the secondary clutch it will seem a little funny but it should only be on the first take off. The clutches act like gearing. Depending on how far down the belt is in the secondary depends on how bad it is. It would kinda be like taking off in 2nd or 3rd gear on a manual transmission car.

Something else you should know is that every belt is not the same. The manufactures have like a 1/4 inch error amount. You can buy 3 Yamaha belts same part number and they will all be a little different. 1 might be a little longer, shorter, or even wider. So a 45 inch belt could actually be 44 3/4 or 45 1/4 in length. I was told once when buying a new belt compare all of them and take the longest one. I have yet to ever do that. Also keep in mind the after market belts have different measurements and widths as well. For example a carlisle belt for my sx700 is longer and wider then the Yamaha recommenced belt. So that plays a part in it as well. They also say you should wash a new belt with soapy water to remove any thing that may be on the rubber. Like a possible oil.


If the only issue is a squeal when sitting still. I would take the belt off. Check it over good. Take the secondary clutch off. Remove 1 of the washers on all 3 bolts. That should drop the belt down a little bit. Then try it again if it still squeals. Take off another washer. But I would bet 1 washer should do it. A little bit goes a long ways sometimes. keep the washers you my need to put them back in some day. Then why you have if off give it a good bath with soapy water and inspect it for anything that looks worn out, cracked or just bad. I also like to take a green scotch bright pad clean up the surfaces on the clutches where the belt runs. ramps is something to look at should be item 2 in the diagram but my sled has 4000 miles on it they look good still. Other then a spring getting weak there not much to go wrong with the secondary. As I said earlier don't get all caught up in the my belt has to be 1/8 inch above the secondary. I had sleds where the belt was 1/8 inch below to make everything work correctly and not squeal.

here are some part diagrams I like to use when I pull something new apart to help give me an idea.
http://www.yamahapartshouse.com/oemparts/a/yam/5003bf6df8700212fc840e31/secondary-sheave
 
Thanks so much! We appreciate everyone's time and help!
We didn't realize that with belt lengths....very interesting!

We first today tried a different brand new belt, it is an ultimate pro and this one squealed worse than the yamaha belt.
So we ended up pulling one washer of each of the 3 bolts (there was only one washer on each of the 3 for some reason)
And it worked out perfect! Now we just need to clean the clutches.
 
Whenever you install a new belt, it should be washed very well, and the secondary adjusted
 
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