150 cc Atv runs great cold after 20-30 mins of riding it shuts off sputters out and stalls. engine cranks and cranks but won't restart. Go back an hour later and machine fires right up. I read on here that it could be a valve adjustment. Would the type of oil effect this would some marvel mystery oil help(it helped on an old Briggs with sticky valves)

#2 125 cc Go kart starts most of the time I have good spark ,but no fuel making it into the cylinder. I pulled the carb apart and cleaned it up with some 2+2 carb cleaner, engine fired all was well for about an hour than did it all over again. Obviously the carb is the issue what is a quality replacement at a reasonable price.

any suggestions as to where to shop for Chinese parts I could use a chain and some bulbs thanks Tom

 

carb issue is probably a stuck float/needle seat. needs to be disassembled completely and really clean that seat. chain, you can take your old chain to a yamaha/suzuki/polaris house and match the link size and get a good chain. light bulbs are light bulbs, 12v is 12v, just gotta match the bulb to the connector.
150cc-i agree, valve adjustment needed.

 

thanks The light bulb thing is a total duh! never thought about it LOL. I will pick up a chain locally. I will try the carb disassemble and cleaning again, would heat effect the performance of the needle? I'll do a search on valve setting thanks again Tom