I'm having 2 problems (2 that I've found) with my 1982 XJ750J. The bike has been sitting for about 2 months. 1) After running (even at idle) for a couple minutes, smoke starts to come from under the bike near the oil pan/collector. I'm not sure if this is the exact location because I can't find where it comes from exactly. There doesn't seem to be any leaks on the engine that I can find. 2) Whenever I blip the throttle to above 3k rpm, the rpms just stay there and don't come down. Sometimes they come down while riding. I don't think it's a stuck throttle cable since I can see the throttle shaft close on the carbs when the bike is not on. I tried spraying WD-40 around the boots for intake and out of the carbs but I didn't see a change in the RPM so not sure if it's a vacuum leak either. Where else could there be a leak? I plan on cleaning the carbs for the first time this weekend (I've only had the bike for 4 months) to see if there's a clogged jet.