A gas power waher 3500 psi ,with a honda gx390..Start proper but after 15 minutes turn off by it self.How i solve this problem??

Hi there aldao62367


if the oil level is at correct level , check that the tank breather in the fuel cap is clear
then change the oil it may be thinning out , and low oil sensor float is not floating and makes the unit think its got a low oil problem - shuts down, also check for a tight valve ?
off the top of head valve clearance for inlet 0.005 thou and ex 0.007 thou

change oil to a 20w/50 or 10w/ 40 oil

should hold about 1.0 litre

cheers pauly46