So I just bought a new yamaha belt (8DN) and went out to break it in today. When I fired it up it had a squeeling noise at idle (high pitched noise) and when I took off it had a slighly lower squeel for just a second or two and then it went away once I got moving. I thought it was because it was a new belt so I drove it to see if it went away. Well just went 70 miles or so and its still doing it (not quite as bad though). Anyways when I parked it in my lawn it was going down hill a bit but it seemed to be trying to move ahead. I have read a post that they took the 2 spacers out from the secondary clutch to help with this. I just wanted to find out if people think this will help or not. If so I'll have to fire it in the garage and take the secondary off (which isn't a big deal) just wanted to make sure that it would help. My old belt was a goodyear and it didn't sqeek so the only thing that has changed was my belt since the last time I was out. I was having problems with over reving (till about 9000rpm) with the old belt but I came on to it a few times tonight and it seems like its right around 8500rpm (maybe a bit higher). Anyways, if someone can confirm about the spacers in the secondary I would appreciate it.
Last edited:
3, 8mm head bolts on the back side of the secondary. under each may or may not be a shim washer. this is how you adjust belt deflection. removing the washers spreads the sheaves and allows the belt to sit further down. this procedure has been covered extensively here on ty.
I moved the sled into the garage and it wasn't sqeeling, mind you I only let it idle for a few min. I got the guard off and the belt appears to be pretty tight (a fair amount more than my old one). I am going out tomorrow again and if it continues to sqeel I'll have to get into things. And just ranting...I bought new ski skins and went to undo the runners and it sheared the front stud right off the runner trying to get the bolt off. I got some new threaded rod and will try to weld a new stud onto the runner.
horkn
New member
yeah, that pretty much is the norm when you try to take old carbides off, even if they are still good.
As far as the belt squealing, I bet it will do it until the belt wears down unless you remove those shims. Yamaha apparently made their new belts wider.
I had the same issue when I put a new belt on my 97 last winter. Taking the shims out isa 10-15 minute easy job.
As far as the belt squealing, I bet it will do it until the belt wears down unless you remove those shims. Yamaha apparently made their new belts wider.
I had the same issue when I put a new belt on my 97 last winter. Taking the shims out isa 10-15 minute easy job.
Yes you need to remove the spacers asap to solve the belt squealing. If not then you could ruin the belt by making it full of spin burns, not to mention the rubber builtup on the primary. It a very easy fix and you will wonder why you didn't do it sooner if you decide to wait a while. As far as the studs, soak em in penetrating oil first it will give you a fighting chance of not snapping them all off.
So I pulled the secondary off today and see there are no shims on the 3 bolts. The bolts don't appear to be worn but I am figuring thats my problem. I am just gonna run my old goodyear belt until I can get the new bolts.
Find some bolts of the same thread pitch and just a 3/16" or so longer and that should solve the issue. I find it odd though that even with the washers removed the belt still squeals. Not to make you feel like an idiot, but it was the three 8mm bolts on the back of the secondary you removed to check right? If there is a small flat washer on the bolt, that is considered the spacer.
Last edited:
horkn
New member
Yeah, it does seem a bit odd that it still squeals with no washers.
Yeah, I thought there would be some washers but there was none there. There are only 3 bolts on the inside of the secondary anyways so not sure how you can mix that up. Anyways, I put the old belt on and it ran great, no squeeling (belt is much looser than the yamaha one). Anyways, I'll get some bolts tomorrow and see if that helps. The yamaha belt does sit a bit higher than the old one so I think thats the problem as there isn't much slack in the belt.
if you looked at the stock bolts, you can see a hardened end on them and they do wear down. also there is a plate between the sheaves held on by three phillips screws that these bolts like to make quite an impression in. if you smooth the rough spots and flip this plate over, it will buy you some time if they dont have your bolts in stock.
So I got the secondary off again today as the new 8mm bolts came in. Upon inspection of the old bolts there was no hardened end on them (threads went right to the end). Anyways, got the new bolts on and the belt sits much lower. The top of the belt is just a shade below the secondary (maybe a 1/16 of an inch lower). I am wondering how low or high the belt should sit and if I should pick up some new spacers so when the belt wears down I can put the spacers in? Thanks everyone for the help, now my sled doesn't squeel anymore.
Glad you got it working better, 1/16" is a perfect distance for the belt to be down in the sheaves. Now just get some little flat washers like you said and you'll be all set.
So I just went out for a little trip but it was too cold to go far (went 30 miles or so). So even with the new yamaha belt she is still reving pretty high. It was hard to tell what the rpm was cause my eye lashes were froze together but it look to be around 8800-9000. So I am guessing I need to change my clutch setup a bit. I'll have to do some looking around on here to see what people recommend. If anyone can help me in the right direction I'd appreciate it. On a good note, I put new ski skins and carbide runners on tonight while I was fixing things and what a difference. The thing picks the inside ski up around corners very easily and bites like crazy. It was a long of fun, found I could take corners about 20mph faster than before.
daman
New member
spec on that sled is 0-2mm below the secondary sheave.
So the belt is sitting at the right height now. I just need to get the thing to not rev as high and I should be good to go.
daman
New member
whats your primary set up? may need more tip weight.
