2003 Mountain Viper Sheave Offset

[Automed]

Spec show Sheave Offset for a 2003 Mountain Viper should be 15 mm.

I measured mine (because the belt always sqeels at idle) and I got 24mm from the back of the primary clutch to the back of the secondary clutch using a digital vernier.

Can my sled be out by that much???

There is a washer / spacer between the jack shaft and secondary clutch but it's nowhere neer 10mm thick.

This sled has never been bent how could it be out by that much?

 

[SMTM700]

Your question made me go back and look at the service manual for my '99 and the '04 and yes it should be 15 mm. (plus or minus a little bit of slack)
There should be a short stack of washers under the bolt that holds the secondary on the shaft and pushes the secondary over against the washer you mentioned beween the clutch and the jackshaft bearing.
If that all looks okay, then it is possible that your motor is out of alignment. But if it is that far out of alignment, then you would get alot of squealing, pulling thread out of one side of the belt and be wading thru belts like they were free from too much heat. I know, I tried it one time. I would reccommend buying a clutch alignment tool for your sled and make double sure there isn't an alignment problem between the motor and the secondary.
The alignment tools really simplify the process and eliminate the problem of holding a straight edge and measuring at the same time!! Good luck!!

 

[Automed]

2003 mountain viper sheave offset

Come on all you guys you must have checked you sheave offsets.......

 

[skidooboy]

if you have electric start, the offset will be different than non ES. is the sled blowing belts or not pulling rpms, or is just the sqeeling killing you?

the squealing is most likely caused by a new belt. they are alittle wider, alittle shorter, and alot less broken in. so that combination makes the belt squeal at idle. there are little washers/spacers on the back of the secondary under the 3 screws. remove a washer at a time on each screw till the squeal goes away. it will open the secondery by letting the screw contact the other sheeve, opening the distance between the secondary sheeves. slightly making the belt act alittle longer, and poof... no more squeal. watch your deflection and add washers when/if needed.

been there done that way too many times, bought an adjustable deflection device that bolts to the secondary to avoid all that nonsense. ski

 

[Homer]

I thought you have to take away washers to get the secondary to open up a little more, which would allow the belt to have less tension on it.

 

[skidooboy]

you're right, changed my post, been so long i forgot it was the reverse. i stand corrected. but again, that is why i bought the adjuster, no thinking going on, twist in till she stops squeeling. no thinking is usually better for me. LOL!

here's MPI's link for the adjuster, scroll down, you'll see it there. ski

http://www.mountainperformance.com/yamaha_power_train.htm

 

[Automed]

2003 mountain viper sheave offset

Here is how I measured the offset. there is only one washer between the secondary clutch and the jackshaft bearing and even if I take it out I still need to move it a lot...