First let me say thank you to all you guys for the great advice. My new to me bike is running perfect. Pulls 10,000 rpm like nothing, 48 mpg all around, splines happy, rectifier way cool. I want to quiet the engine down by doing some form of Kanucks modification. I cannot understand the threads on doing it. Bolt lengths vary- 4 inch,3 1/2 inch, 1 1/2 inch, diameters vary 6 mm- 8 mm, one part goes then seems to stay. I can't grasp the procedure. I don't want to ruin a great running bike so any clarification would be appreciated.