The TT-10 flyweight has been desiged to work with the LO206 engine.  When paired with the dark blue spring (SNO-1301) the clutch will stall very low and stay under the rev limiter on the 206 for the launch and shift cycle. 
 
The TT-10 weights are recommended for the 11.90, 13.90, and 20.00 classes.
 
The TT-10 flywights are for use in the Standard Shockwave clutch only.  DO NOT install the TT-10 flyweights in the OverDrive Shockwave.