chuck_zc

might have a bad fuel cap not venting. Next time it happens open the cap and see if it starts any quicker or pull the fuel line and check for parts. Watch for hot exhaust and engine parts with the fuel.

May also be a collapsed brake hose. Had one give out on me last week in my minivan. Same symptoms. Crack the banjo nut at the master cylinder and see if the caliper releases.

Possibly a crank seal problem. Is it a new bike?

Sounds like you may have a timing chain problem. It may have either broken or jumped a couple of teeth on the timing sprocket.

Hey guys. I just picked up a 84 XT125 in pieces. Anyone know where to find a wiring diagram for the CDI unit and base wiring. I don't want to buy a book right now just in case the thing craps out. Just need enough info to get it running. It won't be having lights and stuff. thanx...