If you are running bigger tires,Start with shimming the drive-clutch about 1/4"(I use 1-1/8" grade-8 U-Bolt washers,they fit perfect).The Drive-Clutch shim is very noticable with big tires,Nite/Day difference!Tear down the driven,If it has a shim between the sheaves,remove it.Then shim it 3/16"-1/4" to start.Try it and you can adjust from there.Hope this helps.
