Help me please!!!!!

[Jim2006]

I just got a honda atc 70 and 90 and i got them running, but they wont stay running but for only about 15 minutes. i cleaned the carbs about 4 times, and they still wontrun very long. does anyone know how to actually dial in the carbs? what could be wrong? i would really appreciate the help.

[Yamahauler]

Try cleaning out the fuel petcocks on the gas tanks, they get clogged up with rust sometimes, after it runs for a while, the float bowl eventually empties faster than it can fill.

[bigreddaddy]

Sounds like they are running out of fuel, or the air filters are clogged up. Did you clean every jet in the carbs? Make sure your gas caps are venting too. How do the spark plugs look? Have you checked the spark?