Im having some trouble with rear sprocket from FH 66cc kit and stock newer cranny hub. The sprocket does not fit completely onto hub,it rubs against spokes? And no room for 2nd black carbon ring(ragjoint)..Please help
I usually replace the dust cover on these hubs with a flat washer drilled to fit the cone nut. This covers the bearings without interfering with the sprocket.That pic looks like you don't have the dust cap installed - did you open the center hole of the sprocket far enough to clear it? Without it you'll trash those bearings in a month or so.
I did the same with my stock cranny, problem there was that the chain connected to the engine was WAY too close to my rear tire, in fact it has rubbed on my tire and shaved a small amount off the tire off, I dont like it, im pretty sure I will need a different rim all together along with a mm hub adaptor,HANDS DOWNAnother problem you will find is that most every Beach Cruiser will have a front tube that is too fat and too far away to mount directly.
On the Huffy's all you need to do is just squeeze the tube a bit with some channel lock plies. The cheap thin steel bends easy and it's better than compromising it by drilling a hole.
When I ordered my Grubee from GasBike.net I added the extra mounting kit, $15 I think, and it came with these added parts so I didn't bother to see if the motor would mount lower without the kit, check that first for yourself. A lower motor mount mean lower center of G.
I just used the longer studs and the extra U extender block to mount it.
I didn't let the unused "rag gasket" go to waste either, it worked great to insulate the motor from the bike a bit and fill in the gap.
I hope that helps all you Huffy buyers but really, I will never use any Huffy for a motorized bicycle build again, they are made "Wallmart Cheap" these days and though they might last you 1000 miles don't count on not spending more to get there than you could by starting with a good bike in the first place.