I have the same powerhead on my Reflexx , I think the crank splines are unique to the sport jet motors . See the thread below on History of the force and You may get some options I asked the same question there a few days ago. Also remember that if you upgrade to a 120 or 175 Sport Jet the jet drive must also be changed due to the 90 having a 1:1.15 drive ratio and all others had a 1:1 . I have thought about changing my powerhead and just having the proper shaft for the motor machined to fit the jet drive . Never got any cost on the Idea.
