Hope it's OK to post this on this forum. Yesterday, while running my PD, the engine started surging at high RPMs(only above 3800). Motor was trimmed where I normally run it and it's never done this before as long as I've had a load on it. Only has about 50 hours on it. Plan to call KP tomorrow but maybe it's something stupid that I can check first.

Sounds like ya sucked up some bugturd in the carb. Surges when it runs out of fuel, then chokes itself to stay goin, or at least that's what mine was doing.

If you have a primer bulb on it, pump it when it starts happening and see if its fuel starvation. (i.e. only happens at high RPM)

I'll try that. If that temporarily solves the problem, what's the best fix?

xgen just had it happen and ended up needing a 2-3 psi lift pump

I was being told it was bad engineering (Briggs), vapor lock of some sort , some need the xtra pump some don't............all I do know is that the pump fixed it and it is now running like a champ...............call PD they have the pumps ya need if ya need it...............check all your lines and tank connections also, could be a small air leak...........

Really? I've run it in warm weather before without issues.

if u put on a vacume fuel pump instead of the pos cam driven stock pump u will solve the problem without having to deal wif a elec fuel pump.

Get the e-pump and get rid of the priming bulb.....problem solved

http://www.mikuni.com/fs-carburetor.html

DA is this what you where talking about??????

briggs has alot of problems wit der coils(this is comming from a briggs mec.)
when u run it for a long tiime the coil begins to heat up and stops thrown fire like it should.. itll start running like sh!t and ya rpms willl drop like it aint got fuel.. they can actually troubleshoot the coil n see if thats ya problem

Just another 2 cents +/- a cent. I had this problem with my PD 36. Switched to all straight fittings,good hose, good pumpbulb,good filter,good connections and clamps,no kinked hoses. Turns out, I have one of those high dollar metal fuel tanks, the kind you can run accross if a snake was to drop off in the boat,AGAIN. Anyhow, when I twisted the vent open(counter clockwise)I was turning it to far counterclockwise,which would choke the vent,just as if I close it(clockwise).TURN VENT COUNTERCLOCKWISE HALFWAY FOR FULL VENT, at least on the metal tanks. Runs fine now.

I changed an inline filter out once and had nothing but problems till I put a second filter on. I had bought 2. Something was wrong with a brand new filter. These things can be finicky for sure.