OK,I'be been wanting to say this for almost 2 years now . I know I'm about to stir up some B.S. on several levels here . I run the HD SBP SHIFT KIT @ CHAMBER. Shimano 360 derailur , 34-14 Shimano superlo mega range freewheel cog , RC Machine head JNMOTORS X-PORT, Arrow Reedblock, DAX RT Carb, and a Jaguar . NGK IUIDIUM PLUG , 93 octane pump gas w/ AMSOIL octane boost 40:1 saber in the tank .Ported& Polish every thing including the pullstarter. TTO gauges gps speed checked @ 52.3mph. The HD bearing is made here by a company called white industries . I no wonder Jack my engine to just to drive chain I fabricated on the left and the right spring operated chain tensioners no more maintenance . I have 2600 miles on my shift kit with no problems . I have talked with Jim and sick bike parts and he said it is sealed bearing just run the **** out of it .that conversation was almost 2 years ago no problems the only maintenance is I'll take it apart just to wipe grease down from the chain lube .if you run a 66 they recommend the HD KIT because the standard free wheel bearing will not hold up in mine is holding up to a race engine 2600 miles of pure punishment. And for as that comoment about leaving you on the side of road it WAS'NT THE **** KIT , it was good old fashion nail flat. None of the guys I ride with dare to call me out in race. If you set up the kit the right way , you in fact have not just built a motorizedbike but motorcycle. This why I go by " Huffydavidson" for real.