If you can make a sg(the longer one) crank work in what ever application your are running you are better off using one. With the standard crank you have to run a pilot shaft for the clutch bell bearing to run on. Because this is threaded on it it impossible to get exactly true with the crankshaft. Most of the time it is very close and you wont notice too many problems, however if it out it can cause vibrations and uneven wear on the clutch bell. The sg is all the one shaft and has a greater chance for everything to be inline.