I just put the Yamaha Torque Limiter in my Viper (no instructions - had excellent help from TY forums though). I was trying to first get the offset and center-to-center distance set with a Sled-Pro tool. That's a slick unit, but after getting the engine located perfectly, a little turn on one of the engine mounts and it would slip out of line again. So I put the Torque limiter on while the motor mounts were loose, then put the Sled-Pro on, and with the limiter on, the clutches were aligned perfectly and held rock steady while I tightened to engine mounts down. Very slick process.