sleddineinar
VIP Member
On the clutching & jetting page when it says, 2-3 engagement shims, is that the 3 little bolts with washers on the back side of the secondary? If so, what size shims .5mm or 1mm?
No, you need to take your primary cover off. there will be (6) 10MM bolts.
When you get the cover off, install the shims in the pocket. I only use shims for drag racing to get my engagement up but run heavier weights
When you get the cover off, install the shims in the pocket. I only use shims for drag racing to get my engagement up but run heavier weights
Engagement shims are large washers that go at the end of your primary spring. This basically brings the tension up on your spring which will bring up your engagement.
I believe 1 shim = 200rpm and they dont recommend more than 2-3
I believe 1 shim = 200rpm and they dont recommend more than 2-3
mopar1rules
Active member
shims of different thicknesses, will change the amount of preload and the rpm increase. a .040" thick washer will have a different change vs a .080" thick washer.
sleddineinar
VIP Member
OK, Thanks. I would really like to learn more about my clutches. On a new belt, to get the right belt height, how many washers should I put on those bolts on the back of the secondary? Also, What are good rpms for my 700. I ride trail, but also like to got WOT across the lake alot. Right now, The initial engagement is around 4300, shifts at 8400-8500 and runs WOT alittle over 9500.
mopar1rules
Active member
a little over 9500 rpm? that's a little too much. most run around 9000-9200 w/pipes. 9500+ is not needed, even w/aftermarket pipes, let alone the stock pipe. yamaha says 8500 rpm is stock, but most suffered the 9000 over-rev issues. also, i believe yamaha says 1 washer behind bolt on secondary clutch. if you have the proper belt deflection, belt ride height, etc right now w/no washers behind bolts, i would leave it alone. if the belt ride height is too high, causing improper belt deflection (too tight), then i would add 1 washer. yamaha has a spec in the manual of the secondary, on the distance that the 2 sheaves are apart from one another, on the way outer edge. its 1.38"-1.42", if memery serves me right.
Clutching 101
Go to this link. Then scroll down to Clutch Components/Gearing Charts. Each item I listed below has a link
http://www.totallyamaha.com/snowmobiles/aaTECH/TechIndex/clutches.html
it will tell you how the below three items control your primary
1. weights
2. Springs
3. rollers
It will also show you how these four items control your secondary
1. Helix
2. Spring
3. Amount of Twist
4. Belt Height
The one thing to remember about about the Engagement Shims your talking about is. Not only do they increase the pre-load of the spring they also add to the total force. So not only will your engagement go up your full shift RPM's will increase as well
Go to this link. Then scroll down to Clutch Components/Gearing Charts. Each item I listed below has a link
http://www.totallyamaha.com/snowmobiles/aaTECH/TechIndex/clutches.html
it will tell you how the below three items control your primary
1. weights
2. Springs
3. rollers
It will also show you how these four items control your secondary
1. Helix
2. Spring
3. Amount of Twist
4. Belt Height
The one thing to remember about about the Engagement Shims your talking about is. Not only do they increase the pre-load of the spring they also add to the total force. So not only will your engagement go up your full shift RPM's will increase as well