Gonna try a dashpot

[Patrick62]

Ok, let me explain the situation. It's the log splitter with the 18hp v twin engine on it running a 22 gpm pump.
It runs fine, but surges... when loaded. This puzzled me for a year or two, and then last year I came upon a work around.
I crank up the idle screw to about the same rpm as the engine is running. Ok, that answered questions.
Slam it into reverse, and there is a little more load on the engine, and it throttles up. Over shoots the speed a bunch, governor drops to closed, and then it is too slow, and it goes back to way too much. Irritating. Worse when oil is cold. Almost normal when oil is all the way up to hot. Cranking the idle screw up to hold the throttle at about RPM keeps it from dropping out while governor figures out where it wants to be. Blessed smoothness.
Yesterday, I was watching this thing doing it's surge, and remembered that some car engines had a dashpot to keep the throttle from closing rapidly. This just might be the ticket!
Set it up on the governor arm as a damper. Ordered one from ebay, and with a little linkage I can try it

Think it will work?

 

[Del_]

It sounds like you need a carb rebuild.

My 18hp briggs IC drives a 28gpm 2 speed pump and would stall on heavy sudden loading. When I replace the carb gasket I found that it had failed and was letting two sections of the carb bleed into each other. The gasket fixed it and that was 5 or 6 years ago. Still working fine.