Marbling = overheating?
My bike has been backfiring from the rear cylinder like crazy.
I couldn't find the right sized marbles or copper fittings, so I ended up buying 4 5/8 rubber chair legs. What I did was remove the hoses altogether, and put a stopper on each cylinder nipple and also on the two nipples under the seat. There was also another big hose and a small hose on that thing under the seat, but I left them as-is.
Anyway, the backfiring didn't get any better. So I fiddled with the carb screws a little more. I found that 3 turns on the rear cylinder and about 1 1/2 on the front seemed to stop the backfire.
Problem is, now the bike seems to be running hot. The temperature was just slightly above the middle of the gauge. Not into the red, but a little above the tiny thermometer symbol. There was also a small amount of smoke coming out from behind the engine when I stopped. Could marbling cause it to overheat?
It always ran pretty cool before, about 1/3 up on the gauge. Maybe its just warmer out today (almost 90), but the gauge creeping up above half freaked me out a bit. And the smoke didn't help. The bike had been sitting for pretty long before I bought it, maybe it was just burning off some grease or something. Either way, is it possible marbling could cause this problem?