09-19-2017, 04:22 AM
We have a starter like Jim Waltz shows above, but without the mods. They are readily available on E-Bay. One reason the shaft is so long is that it has a one-way clutch. The vast majority spin CW, but make sure you check before buying. Those starters don't have proper bearings for surviving the side loading that you'd get with a belt.
GEM parts are now sold by Brian Jacobson, vkpbrian@gmail.com or on E-Bay at kartsmart13. There are two GEM P/N's for WB820's. Jim W described the one everyone uses (7/16-20 LH on one end, 3/8-24 RH on the other). A 3/8 socket-head cap screw ("Allen bolt") has a 5/16" hex recess, so that's what most starter tips have. The other GEM nut is the same except in place of the 3/8-24 RH threads, it has a 5/16 hex broached right into the nut, and it is useful only for the rare setup where you're starting from the flywheel side. All WB610's and 820's whose output shafts rotate CW have LH threads on both ends of the crank. All whose output shafts rotate CCW have RH threads on both ends. Have fun! The WB820 is a great motor to start out with.
GEM parts are now sold by Brian Jacobson, vkpbrian@gmail.com or on E-Bay at kartsmart13. There are two GEM P/N's for WB820's. Jim W described the one everyone uses (7/16-20 LH on one end, 3/8-24 RH on the other). A 3/8 socket-head cap screw ("Allen bolt") has a 5/16" hex recess, so that's what most starter tips have. The other GEM nut is the same except in place of the 3/8-24 RH threads, it has a 5/16 hex broached right into the nut, and it is useful only for the rare setup where you're starting from the flywheel side. All WB610's and 820's whose output shafts rotate CW have LH threads on both ends of the crank. All whose output shafts rotate CCW have RH threads on both ends. Have fun! The WB820 is a great motor to start out with.