Press On - Pull It Off

Before you get in a big hurry and assemble your flywheels, always (always) be certain your drive gear(belt or chain) fits the splines of your sprocket shaft.  I've seen a lot that didn't fit, or were very tight.  It's a bitch to be messin' with this after your motor's all assembled.  You just might have to service this thing out-on-the-road somewhere - and you'll be screwed if you can't get it off (on back on) with no air tools or fancy pullers.  Upon initial inspection, it started on the splines(barely) and I supported the shaft and pressed it on(carefully) and pulled it off.  Then deburred the burrs.  I did this a few times until I have a nice press fit - and I can remove it with my "tool kit" puller.