electric problems?
 

My son bought a 1981 Suzuki GS450 last year. Garage kept, in good shape, etc. After putting a new battery in it, getting the carb tuned, and riding it for about 2,000 miles, It failed to start. We put it on a good brand trickle charger the first month he was off to college, and it started fine the first long weekend he was home. On the third day of riding, I noticed it was sounding like a low battery again when he'd try to start it. Okay, to shorten the story, now that he's almost done with the school year, we hooked it up to a new battery again. Same thing happened. After riding it for about 150 miles, it would just click. Oil level is fine, oil is new, plug is new, and Im befuddled.:eek:

Would think it either has a short, or the alternator is not working. You could try and put an ammeter at the battery and see if there is a current draw when the battery is off.