Blowing drive belts

[rogerz1000]

Ok, When I get her together and get to ride again in this snowless North East and pin her at 100mph plus I will update and let you all know

 

[Blue Dave]

Ok, When I get her together and get to ride again in this snowless North East and pin her at 100mph plus I will update and let you all know

Hopefully your belt will outlast your slides! We are in the same snowless situation here in Minnesota!

 

[rogerz1000]

Yeah, I've heard! We are all praying for snow for sure. I had to drive from CT to Maine. 7 hrs to ride. Might go again this weekend, or if not in 2 weeks for sure for another 2 nights stay over. I am doing shims tonight and springs tomorrow, so time will tell!

 

[rogerz1000]

Hey guys, another quick question. I had play in the secondary before I removed it. The Play was in and out play, if you grabbed it with both hands and went towards, and away from you. Not up and down, or forward to back play. After shimming it there is no more in and out play. I believe this is ok and what has happened to me in the past after shimming other sleds in my 2 stroke days. Can you guys confirm?
Thanks!

 

[Blue Dave]

Hey guys, another quick question. I had play in the secondary before I removed it. The Play was in and out play, if you grabbed it with both hands and went towards, and away from you. Not up and down, or forward to back play. After shimming it there is no more in and out play. I believe this is ok and what has happened to me in the past after shimming other sleds in my 2 stroke days. Can you guys confirm?
Thanks!

Yamaha driven clutches are designed to "float" on the jackshaft meaning that a small amount of "in and out" play is normal. In theory this allows the driven clutch to "self align" itself with the primary clutch. If you "lock" the driven clutch in place on the jackshaft by adding shim, then you need to be sure that it is perfectly aligned with the primary clutch.

Here is a link to an interesting technical article about how the "self aligning" of the driven clutch does not actually work in reality. It also explains the two ways to check the clutch alignment. This article references the RX-1 but it is equally applicable to the Apex. It has me thinking about trying a "locked" driven clutch on my sled. Mmmm......

http://www.totallyamaha.com/snowmobiles ... hAlign.htm

 

[yamahahaapex]

heres another thing. not sure if you just bought this sled or not but a buddy of mine had a problem with his blowing belts ever 70-100 miles. the prev owner left his mountain helix on and that was causing the problem with how his whole set up was. he changed it back to flat land and no problems for over 500miles now. just a suggestion for an idea. went through everything, alignment, cleaning etc and nothing worked.

 

[thor452]

Hey guys, another quick question. I had play in the secondary before I removed it. The Play was in and out play, if you grabbed it with both hands and went towards, and away from you. Not up and down, or forward to back play. After shimming it there is no more in and out play. I believe this is ok and what has happened to me in the past after shimming other sleds in my 2 stroke days. Can you guys confirm?
Thanks!

did you shim it before or after you started blowing belts?

 

[Mongo 1]

Do yo have stock clutching? After a ride how hot are the clutches and belt. Dirty clutches can cause many strange problems. We had to completely disassemble his after each belt failure to remove the cords rapped around the shaft.

 

[rogerz1000]

Hey guys, Yeah totally stock clutching. Got the sled mid year last year. Rode the hell out of it after going through it a bit but never lost a belt until I held 100mph plus on a crazy 2 mile straight this year. I have just shimmed it all up and mad everything perfect. Cleaned everything and put in 2 new springs as well as the sled has 7,800 miles. All bearings are tight as they were done not long ago. I will be riding 2 weeks from today and will let you all know how it goes. After I brake in this new belt with everything straight now I think it will be perfect!

 

[Blue Dave]

If my math skills serve me right that was 1.2 minutes of WFO. Seems to me a belt should be able to handle that. LOL!