Sounds like my honda 250trx, mines old as I'm pretty sure it was a 3wheeler originally.
Have you tried holding the throttle to keeo it idleing? The issue im having is that it won't idle after going for a run it just stalls out. I've turned the idle up on the carb but it still stalls out I have a rubber band around the throttle to keep it idling.
I've put it down to the idle jet being blocked up and a carb that has never been cleaned in its life...
I'd be pulling the carb out and give it a good clean, carefully get some thin wire into all the holes and get all the gunk out.
I pulled the hose off my ballcock and drained the fuel into a container, the amount of rust and grit that came out the tank was ridiculous. It could be a blocked up fuel line but it probably won't start at all.
One more thing the choke could stuck on, flooding the engine. You said it won't star for 15mins? This could possibly be the issue also.
Hope this gives you a few ideas, good luck with it.
Cheers Jim
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