Snowmobile World banner

New belts

3504 Views 22 Replies 17 Participants Last post by  Sled Dogg
Hi guys, When I put on a new drive belt I run 20 miles at half throttle or lower. Is there another way you guys break them in?

PS: Not to rub it in  but the riding is starting to get really good here.
See less See more
1 - 20 of 23 Posts
I ride it normal, but don't punch it from a dead stop till it hits about 80 miles or so.
i've never heard anyone talk about a belt break-in period.
Oh yeah Paul! Its all the rage in Europe...everyone is doing it now-a-days!
See less See more
punch it right from the get go.... might as well break it in the way you ride it, ya know what I mean?  
See less See more
If you punch it right from the get go, the belt will not have time flex all the cords properly because they are stiff from the factory. I like to let it loosen up for 50 miles or so before pinning it from a dead stop. I think Gates even recommends some kind of break in procedure on the package.
I do the same as rocketman, i never heard of this till about two years ago, the guy that told me i believed that he was on glue.  But i found out the expensive way it never bothered the belts on my older smaller sleds but the 800 will eat them up if i don't do a break in period.
I also had never heard of such a thing until a couple years ago.  Aside from what Rocketman mentioned, I also heard from racer buddies to take a wire brush and lightly scuff the outer edges of the belt all the way around.
Hey sounds good about a break in, but man it is tough to resist punching it for a whole 50 miles  
especially this winter when 50 miles is a big deal
See less See more
I never really broke a belt in on my 600, but it makes sense to me, especially on bigger sleds.  How about any tricks to extending belt life and keeping performance up.  How about taking the gloss of a the belt and clutches with sand paper or an emry cloth?
Breaking a belt in does extend belt life and therefore keeps the performance up.

  That scuffing business is new to me...what is the purpose?
See less See more
Just out of curiosity.....What kind of life do you guy's get out of your belts? (milage/years) just changed mine yesterday. The old one has 1,900 miles on it. Is that good or bad? Oh...stock SD belt.
We all know, eveybodys got thier own way of doing things...

Here is mine...
I break in a new belt by trail ridding for 20 to 30 miles.  Then I take it off and save it for race day.   I don't exactly agree with Rocketman about the factory stiffness stuff.  As i see it, once the belt is hot, it should NOT streach anymore, careless if it is bran new or broken in.  

I compared a new belt with a used one (measuring deflection) and both belts were the same.  Once the belts were warm then they seem to change from when they were cold.  

As for hammering the throttle?  IMO: once the belt is warm then it is ready to go!  never race a cold belt!

As for the "scuffing bussiness"?   Before race-day, I clean out the TRA with Acatone and compressed air.  I lightly scuff the clutch surfaces with scotch-brite.  This will remove all the belt residue left on the clutches.  Then I remove all the left-over grit with acatone and an air compressor.  I found that this helps the clutch surfaces grab the belt better.
See less See more
Butch, that's pretty good in my opinion.  I've gotten varying opinions on when a belt is bad, or doesn't perform good anymore.  Say, when I load it on the trailer, or pull out of creeks or ditches, and the belt slips and burns a little, it creates glossy spot on the belt.  Some I ride with say the belt is junk after that.  No I know it's not junk, like it's going to fail, but that you will loose a noticable amount of performance because of it.  This is when I was talking about scuffing up the belt of clutches to get rid of the gloss and allow it to grab a little better.  Contrary to the ones that tell me it is no good after that happens, I usually still ride it.  I'm not in competition for prizes, so I figure as long as it doesn't break I will still ride it.
i got 2200 miles out of my stock polaris belt on my 99 indy5xcsp...still actually looks cans ee the sides are rubbed but still will make a excellent backup..i dont think it prolly needed to be change but after 2 yrs i figured itd be good..put on a gates extreme..dont know how much i like it...havent noticed much difference yet...time will tell-INDY
The one I took off wasn't "bad". Like you say jayjaysin, I'm not in it for the prizes. I just happened to notice that it wasn't performing as good as last year. There was a considerable amount of side play in the primary compared to the new belt and the new one sets up in the secondary compared to the old one which had worn down to setting flush. I also cleaned the clutch sheeves with a Scotchbrite pad to clean off excess rubber residue.
I run about 1/2 throttle for a few miles, just to get it hot......  Then it's blast off time.  Got another 1 just in case....
Any belt I buy I wash it in a solution of soapy water. Belts have a little oil on them from the manufacturing process, washing them off reduces the chance of burning the belt.
I echo "skidoomasters" reply.  I'll also add you should not carry a new belt that hasn't been broken in as a spare.  Chances are you won't blow a belt in perfect trail conditions, it'll disappear in waist deep snow on the side of a mountain!  Thats not the time to break in a new one!  Believe me!
See less See more
Just My Experience, But It Works For Me.

Think about the term "break in". Does this not really mean Break It?
LOL that is what my engine rebuilding instructor at school said.

I put the new belt on so that I can read it normally, to ensure that the belt always gets put on the same direction.
Put the sled up on a track stand and spin the track for a few minutes.

This "break in" should be done before every ride. Just think, the belt AND the track are "frozen" into the oblong shape that it was parked in. Ice Cold Rubber.

The racers that I know clean the belt with soap and water with a scouring pad to remove the Mold Release Agent.

Just get it warmed up and flexable before beating on it.

As for mileage, well how agressive do you ride? That will make alot of difference.  
See less See more
1 - 20 of 23 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.