You have to get the RIGHT carburetor.. I went through a few pages before I found the rite one.. :doah:
First thing to look for is the adjustable fuel screws, one in the side, and one in the bottom of the carb..
Just about as important is the throttle attachment, and size of the carb.. 3 horse, 5 hours, has like a AA battery sized hole through the center of the carb..
To attach your carb to an H35 engine, and hook up and use the throttle system.. You have to have the right throttle shaft..
H20 - H35 and HS40 and HS50 carburetors all use the same throttle shaft... H80 and 100 8 and ten horse carbs use one that looks the same, but the whole carburetor is much bigger, and won't run on a 3 horse..
You want one that looks like this.. a throttle shaft with holes in the same locations as your carb has... and two fuel adjustment screws... main in the bottom, idle in the side...
Carburetor for Tecumseh 631921 632284 631070A Fits Many H25 H30 H35 Engines | eBay