So I've been doing some short hops outside the driveway as I set things up on the bike. Changed the gearing a bit to end up with a final drive of 6.46:1 from the previous 7.38:1 and the Kenda 19" Road Go tire. It was just a swap of the front jackshaft #35 driven from 20 tooth down to an 18 tooth I have. It pulls well enough still, but it's a little slower on the lockup with the crappy Max Torque clutch I'm running. I've ordered an Inferno Flame to try a bit more variety for the hookup, but it's not here yet so starts are slow but solid once the rpm's build enough for a lock on the shoes. I ran it up to about 6250 rpm on a short hop & the engine was still pulling hard when I had to back down to slow down to duck back into the driveway.
I ran it last night with the lower gearing & noticed that the chain was starting to chew into the frame a bit on the side of the notch at the top (see picture below). Hmmm, looked at the sprocket & noticed it had shifted slightly inboard (toward the tire & frame cutout) and it was a little bit loose on the axle. The set screws were put in place with blue Loctite and they were still tight when I took them out, but there's enough "slop" in the hub as it came from BMI that I think I may have to try something different next time.
It's a standard 1" bore Azusa type hub made for a live axle. I didn't mic the inside diameter of the hub, but it isn't a very good fit on the axle as it can move a little too easily, until the set screws are clamped down hard. The same thing happened with the other side on the brake disc hub. It was just a little loose, so I reset it as well & put the screws in with blue Loctite again. I'm thinking I may need to take things completely apart (again) & then drill & tap a few more set screws in the hubs, to give them a better bite on the axle. There wasn't a problem with the keys coming out, but it's not the sort of thing I want to have a problem with at higher speeds. Open to suggestions on this one guys. Here's a picture of the hub type I bought for the drive sprocket & disc brake. If you buy one, it may need to be modded a bit to run tightly on the axle prior to installation. Just sayin' you should check things out on these parts since they aren't a very good fit as manufactured & shipped.