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"The non-adjustable jet replacement carbs for small engines came about due to emission regulations. Al Gore type carbs." That explains a lot. This snow thrower was purchased in 1987! Happy New Year to all...Today it is warmer outside than it is inside! But there is bound to be snow sooner or...

Thanks for the comments. I have a soft bound Tecumseh book called "Mechanic's Handbook" for 3 - 10 HP engines. On the back it says "R2/93" which I presume means "Revision 2, 1993. I also have a Tecumseh "Technician's Handbook" for 3 to 11 HP L-Head engines dated 1998 that I downloaded from...

Thanks for the comments. The one that I ordered used that same stock photo of one with the adjustable main jet, but the one I received did not have it. It says it is compatible with the HS 40 Tecumseh.....I may try that in the off season. Right now the machine runs OK, and I don't want to...

As I already said, I installed a new carb. I don't need any information on the seat or how to adjust the float level. The question I have is: Is the main jet mixture adjustable, and if so, how?

Thanks for the reply. I thought to replace the needle and seat of the original carb, but seat did not seem to be replaceable. When I purchased the new carb the description stated that it was for a 5.5 hp, 22 inch snow thrower. My 422 model is 4 hp, which is what leads me to believe that if...

My Snapper 422 snow thrower with a Tecumseh HS 40 engine was working but acting as if it was too rich and using fuel much faster than it should. First thing I found was that the fuel supply hose had a slit in it. Replaced hose, but engine was still not working properly. It would start, and...