sputtering under load

[SDiver40]

This may have been covered before but I cant find it if it has. I have searched the internet, youtube and here on this site and cant find a fix.
My SA cranks up and runs smooth as can be. If I push the throttle past 3/4 in a quick motion, it starts sputtering. It sounds like it is flooding but will clear up after 10-15 seconds. It does the same thing if I let the clutch out a bit too quick or try to sink the cultivators in the ground.
It has the factory carter carb on it. I have cleaned it out and adjusted the float. It has a good flow of gas up to the carb. Once I get past the sputtering part ( IF it dont cut off ) it seems to do better. It will sit there and idle all day and never miss a beat.
I have read where people refer to the governor as hunting ( surging up and down ) but this doesnt sound like surging to me. It's more like flooding but I cant smell gas or see black smoke.
Does anyone have any ideas where I need to start looking or try next?
Thanks Tom

[havoc1482]

Your governor spring may be worn. Essentially the governor isn't properly adjusting to the load in time. We have a Cub that does this, it doesn't open up of the throttle enough or fast enough in relation to the load on the engine.
If you take the cover off of the governor you will see this:

The big spring you see is the one I am talking about. The little one coming up through the bottom is the bumper screw spring. Check both for wear, lack of tension, ect.


Since you tackled a possible fuel problem and you don't see any signs of a typical flood (smoking) then I can say for certain you are looking at a governor related issue.

[Super A]

Clean your carb again and check your adjustments.

Al

[SDiver40]

Hello Havoc and Super A
I wanted to thank you for the good advise on my problem.
Your suggestion on checking the governor spring got me to thinking and searching some different areas.
I found an article on the internet with the directions on adjusting the carb linkage. I figured I would try that before pulling the governor apart. That's the one thing I haven't tried. I pulled it apart this evening and it was out of adjustment about 3 turns. I turned it in a few rounds and put it back together. At first it ran wide open. I thought I had made it worse. Figured why not adjust the idle screw and rule that out. It settled down and ran like a champ. Sunk the cultivators in the ground and sure enough, the governor took over and kept right on going.
I still think I may need to replace the spring. The carb linkage has no more adjustment left. But for now i'm tickled to know it will run like it should.
Thanks again for the advise and help.
Tom

[havoc1482]

Glad to hear its working out. Just so you know, you do not have to disassemble the entire governor to get to that spring. Its a little tricky to get to, but you can remove the governor cover and replace the spring without taking the front end apart. If you do, just be careful to not lose the thrust bearing and make sure it doesn't separate. Mine did and it fell to pieces all over my garage floor haha. Had to replace it, it was probably needed, but nonetheless be careful.