I own a 1982 yamaha xj650 turbo charged motorcycle and I'm having problems starting it. It has sat for a couple months without being started. It attempts to start right away then just cranks over with no results. It will do this everytime after setting over night or waiting several hours to try and start again. I tried draining the fuel from the tank and adding fresh fuel with no change in results. It has always been a hard strater and I read where this model is touchy at start up when cold. Never this long though. Any help?

The "Starter Clutch" is on the end of the "Starter Motor"

http://www.bikebandit.com/houseofmotorcycles/1982-yamaha-maxim-650-xj650j-starting-clutch/o/m147106sch225865

Not uncommon for a Yamaha that has sat this long. Condensation in oil has rusted the clutch plates together. You can try riding the bike in 1st gear and with the clutch held pulled in snap the throttle open and closed repeatedly untill it breaks free. This will be a wild jerky ride so be careful and have plenty of room to operate. If it does not break free within a period of time that has brought the engine up to full operating temp. then dissassembly of the clutch will be the only answer.

Mine was stored for 20 years, I ended up replacing the seat and needles, cleaning them thoroughly and when I tried starting it, nothing!! No gas was going to the carbs, it turned out to be my gas pump, it was seized by the old gas remains 'varnish' so I had to clean it numerous times, soaked it in gas cleaner (short period at a time 15 minutes or so, being a very powerful cleaner, you cannot leave it for long without causing greater problems, thus I was able to get the pump going by boosting it with my car batterie, having more cranking amps directly to the pump, the pump was able to release itself from the old crusty varnish.

You must mount the tank and hook up the fuel feed lines. But you do not need too bolt the tank down just to start the engine.

my guess would be that water got into the gastank fuel line and carb you might want to check those thing fallow this link this will tell you everything you need to know about your bike and more

good luck!

http://www.bikebandit.com/1982-yamaha-xj650-motorcycle-parts/oem-parts/s/mg7971

Check the electrical switch in the clutch lever, most bikes have one as a safety, so you cant start it in gear, unless the clutch is in, could be a faulty switch, also do you have a switch on your side stand, sometimes these can be faulty as well.

Yep. Have you tried to use slow charger on your battery to revive it again. Check your charging system because nothing comes in but all goes out.

Autozone may have the manual for your specific bike.