Thanks for the chain info. I'll put some thought into it while I wear out the oem chain. The increased possibility of lugging the engine is what bothers me a bit.
I found the turn signal problem, and it was not something I expected. I unplugged the connector behind the right side black box, where it connects to the harness from the tail/brake/turn signal harness. I found I did not have continuity on the hot wire that goes to the right rear turn signal. I traced the wire where it is clamped along the underside of the back fender, and up close to the front, I found the tire had rubbed against it, worn through the plastic sheath, broken the turn signal wire, and damaged a couple of other wires. This may have been caused by excessive rear suspension sag, or it could have been just loose wiring rubbing on the tire. I am going to modify the harness to make it longer, and reroute it under the seat, away from the tire.
The rear shocks appear to be adjustable for preload, but there was no adjuster tool in the tool kit, and no reference to it in the owners manual. I have a huge box of oem tools from Japanese bikes, hopefully one of them will fit.
In looking at the rear part of the frame, it does not look very strong. I weigh 230, and the manual says the load capacity is 398, so I should be ok.