Well, I bought the service carb put my choke shaft on it. Still runs like crap Pops and backfires when I try and go full throttle. Once it gets going and it's warm full throttle does not open the butterfly the whole way. So full throttle I am going about 5 mph of that. Plus it idles to high and the idle screw not touching the butterfly. I give up. It's the same part number as original carb. Governor is set correctly. I don't get it. I have tried eBay carbs and other brands. This latest is a Tecumseh service carb with the same part number as the original. I would appreciate any help. I can't figure out out. Thanks