Picked up a 2013 PW50. Bike runs for about 5 minutes then just bogs and cuts out. Won't start for awhile, but then will fire back up. I've checked the spark plug after it dies and it's dry, so don't think it's a flooding issue. So far I've replaced the spark plug and air filter. Stripped and cleaned the carb and start/run switch. Also added fresh fuel, 2 stroke oil and gear oil. Still no luck... Any ideas?