Carburetor for Techumseh HM100

I have a generator with the 10hp Techumseh engine. It was lunging and surging. I tried the adjustments mentioned on this forum with no luck. I bought a new carburetor that said it fit this engine. However, it does not have the high speed adjustment screw in the bottom of the bowl. I installed it and the engine runs but sputters and wont level out. Will this carburetor work on this engine? It also has an extra port in the body where the choke butterfly is. Do I need a different carb?

Thank you. I'll give that a try. I thought about buying a rebuild kit for the old one as well.

It sounds like you disturbed the governor setting. With the engine off loosen the screw that attaches the governor lever and  move the throttle to the wide open position. Now turn the governore shaft in the same direction as far as it will go and without disturbing anything tighten the screw.

For what its worth I have a Garden Way (Troy Bilt) best lawn vacuum with a 3.8 HP Techumseh that I bought it 1993. It has always been a bear to start when it sat from Fall to Fall or even a couple of months. It was one of the first of the carbs without a main jet adjustment and a primer start. It finally got so I couldn't start it without putting gas into the combustion chamber. Because I like the vacuum I spent the roughly $30 for the knock off replacement carburetor three years ago. Bolted it on and it started the first pull and has continued to do that. It never did that with the factory carb. The new carb is better than the original was and has the ability to adjust the main jet built into it. This is the carb Tecumseh shouldof bought from the Chinese all those years ago and they would of had a better engine.