I have an MTD snowblower with the Tecumseh engine. owner bought a replacement carb (from China). Took the old one off (and threw away ) and put the new one on. He said it would not run (either carb) so assumption was old carb was bad . I have checked compression and spark. Both appear to be good. Govenor rods appear to be located in the correct positions on throttle lever and carb.
Closed the idle mixture and hi speed screws in all the way and started at 1.25 turns out. It started but was running rough (barely running). Started with the idle screw and was not having any success in getting it to stabilize. opened up hi speed on carb bottom and did get it running at a more appropriate RPM in full throttle position. But when I tried slowing the throttle lever down the engine did not change (it did not reduce down to "idle" speed). It stayed at the same RPM until I turned it off. Ran out of time to do anything else, but looking for thoughts when I get back at it.
My first intent is to remove the bowl and idle and hi speed screws and clean as necessary (even though a new carb). Reinstall and start at 1.25 turns out on both screws. As far as adjustments should I be starting with one over the other to get running smooth? Is there something in addition to the carb adjustments I should be looking at? It seemed weird that the engine would not idle down for me moving the throttle lever....
Thanks.