Well today my gx390 let me down and left me embarrassed. Had to tuck my tail and tell the homeowners I would have to come back to finish their driveway. Basically my motor is revving high and "surging". Hard to explain really. After I use a high pressure tip, surface cleaner, basically anything other than my jrod it starts waning and trying to recover. It flat out would not run my surface cleaner long enough for me to finish the job. So y'all that are familiar with these motors. Can you throw me out some possible problems/solutions? Or could It be my pump? So frigging frustrating. Here's what I've done. I've checked the needle and bowl for debris. (None). Checked valves and I'm pretty sure they're adjusted like they're supposed to be. I will do a fluid change on motor and pump. And change the spark plug. The carb is new with only like 30 hours on it.
I'm about to say efff it and buy the 8gpm a lot sooner than I wanted. A lot of options. For mostly residential and light commercial would y'all recommend the 630 or the 690? I know I want a Honda motor. Can't figure out which pump would be good. I'm wanting to stick with cold water but have the option to add a burner down the road. Sorry for the long post but it's been one of those days from hell.