some ramblings:
when you thumb the starter, do you hear a slight whirring sound near the left cranckcase? if so, the starter sprag prolly needs to be fixed.
what weight oil is in the bike and what were the temps when you tried to start it? if it's too cold, a thicker oil may not flow enough for you to start the bike (at least that's how it is on the 900 and 944 cc bikes). did you try it on a warmer day? sometimes, i lean the bike left and right to get the oil flowing a bit or use some heat source on the cases. for example, i couldn't start my 944cc FE a few days ago in the 30's but it started right up today in the 50's.
have you checked the plugs to see if there's any juice? what do the plugs look like, dry, sooty, wet, ... that should tell you something.
is the choke engaging/disengaging freely?
what's the voltage reading when you turn on the ignition? for a wet battery, it should be 12.6v. if it's below 12.4, it's fairly hard to start it.
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