My 86 Gamma RG 500 is possibly the nearist bike in the world to actualy owning a real factery prepared GP bike!!!!!!!!!!! I am amazed at how ell it handles. The atock engien stacked up nicly against bikes of it day and then soem like 750s !!!!!!!!Modifications to frame and engine are easily accomplished to achieve even near to heaven GP performance. One woner is now( 2003 Maehc) at the 145 rear wheel HP mark. Mt bike is nearing the under 300 lb too so thee is still development by all involved to get this great scoot into more faverable view by others. Thsi bike is already a collecters item. Vluses starting about $6000.00 US and for a well modified over $15,000.00 I will try and reply to you who ask about such things. John or Gammer9 !!!!!!!!!!