Must wait 30-40 mins to restart engine

manual said use champion qc12yc spark plugs gap 40 hard to found i use b&s plugs fail out. do i need to use qc12yc plugs

The first thing I would check would be the oil level, to make sure you didn't put in too much oil. If the oil level is correct, it could be a stuck piston ring, letting oil blow by the piston, and out the exhaust. If this is the case, you are going to have to tear down the engine.

Hope this helps!

We power washed houses for years with a 2400psi machine. The machine weighed about 90 pounds. 1 strong man could pick up the weight, but usually it took 2 men to unload it from the trailer.

A small machine can advertise 2400 psi ... but that is for 3 square inches at a time. The heavier machine shoots a 10" or wider swath of 2400psi.

We ran our machine twice a week for years. We had a honda engine. I'm sure the briggs engine is good. I wouldn't buy a used machine... unless the price was low and it started on first pull. Electric starter on your power washer might be a repair-waiting-to-happen because it is constantly exposed to water and dirt.

Check the fuel pump.Thanks for asking and I hope this helps out.Please leave me 4 thumbs up.

Check the float in the carb. It may be stuck in the up position due to debris

Surging is usually caused by a lean condition You can try to turn the mixture screw ccw about 1/4 to 1/2 turn. If this does not solve the problem your carb will have to be removed, cleaned thoroughly, and reinstalled.

Sounds like you coil is over heating after running a few minutes. The windings are seperating, then when it sools they make contact again. Try replacing the coil.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

check for 12v constant at your fuel pump if you are not getting that replace your relay.
if you are getting 12 volts at your fuel pump the fuel pump is possible to run tuel it gets warm then shut down to a lower rpm I would then replace the fuel pump

May have sediment buildup in the pump housing, ???

Always use straight 30W oil in small four cycle engines if they are not liquid cooled. Use a brand name single weight 30 viscosity oil.