He said it still takes 30secs with jump leads....
You need to fix/check all the obvious things, even if its just to rule them out:
Fresh sparkplug (and verify good strong spark)
Clean carb and jets
Fresh (or cleaned) airfilter
Check/adjust valves
Check battery voltage, while idling, reving, and under load (turn lights on without starting the bike voltage should still be over 12v)
Then you can do some real troubleshooting.
As a temporary fix, try to turn the fuel of a couple 100 meters before you get home. See if it helps.
Good luck.
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