green250
the electrical has been done to death in this forum, try a search ( more than 4 words)its usually a duff battery, or voltage regulator.
the xs400 is identical to the 250 except for carbs, valve sizes and bore, so you can down load the manuals at the top of this page. ( its called xs400 links)
clutch is really easy and the manual will show you how.
if you have any probs come back to us
drewps