20 Most Recent Tecumseh Horizontal Tiller Engine 8 Hp, 1" X 2 57/64" Shaft, Modelno. Hm80 - 155656x Questions & Answers

I had exactly the same problem, I tried to clean the carb several times without any luck. I gave up on the carb as it was an EPA style without adjustable mixture needles. Bought a new carb for it, installed it and the engine fired up right away. Took me 10min to let it warm up and dial the mixture, it has been fine ever since.

I recommend to buy the replecement carb old-new stock mfg pn: 632334A Tecumseh Carburetor with mixture needles

This place helped me out with one.

check to see if air filter or supply tube is plugged

turn till they seat then back out one turn to start then fine tune when running

Not unless you cut the wire and splice a new piece on, which I would not recommend. A new coil should cost you less than $20 and is not hard to replace. See the attached YouTube video on how to do it. https://www.youtube.com/watch?v=v6bQrNr4lv0

The Tecumseh snow motors are notorious for idling rough. Especially the last few years of production. Most service techs just say "live with it" But there are a couple of things you can do to help.
It is not a carb adjustment issue. It's usually a fuel, clean carb issue.
First, use a premium grade fuel without ethanol and a fuel stabilizer. This will give you the best fuel mix.
Second, Remove the carburetor shield and clean the inside and outside of the carb with carb cleaner. Even though you can't see the carb usually, they do get varnish build up and cleaning it will help some.
Third, Put the recommended amount of fuel system cleaner in the gas. I use Sea Foam brand. Over a tank full or two you will notice a difference in how the engine idles.
Fourth, Use a high quality spark plug and use a new one every year. Make sure the gap is correct.
Good Luck! Feel free to as any other questions you may have. Don't forget to rate this answer!

oil seal is worn out from durbis wrapped around crankshaft need to replace oil seal by removing blade and hub
clean cranksaft with fine sand paper
a sharp awl punch in the outter edge corner of seal on a 45 degee angle then slide seal off

heres the manual.pdf page 75

Is fuel getting to the carb? Check the fuel line it may be plugged. The rubber deteriorates after many years and plugs up the line and or jets. Its always best to replace the fuel hose when you rebuild the carb. Have you checked for a spark at the plug?

180 - 240 inch pounds

Check the gap between the coil and the flywheel. You can fold a dollar bill over a few times (3 or 4 layers thick) , place it against the flywheel , **** the coil up to it , and then tighten down the coil. This will give you a good clearance between the coil and flywheel and promote good spark.Essentially I am suggesting you use the folded dollar bill to set the coil to flywheel distance/gap. If it still doesn't work, I am at a loss. Is this a multi cylinder engine ? If so , does it have points or electronic ignition ?

Clif - I have two items in my garage with Tecumseh engines on them in that HP range and they both specify .030 spark plug gap in the instruction manual.

You need to open its small tank and fill up the fuel.

the replacement pull rope for the motor will be the right length if you buy a genuine pull rope or a rope that is for your machine. The choke should be in the full open position when warm

check for rusted shafts and or bearings as you use this machine a few times a year in the worst possible conditions and the rest of the time it sits idle in the shed.

as with B&S motors the engine number will be stamped in to the air cowling on the side or above the spark plug

Check point gap---gap to magneto/ fly wheel ---condenser--HT lead. switch wire is not shorted out.

take off the and and turn the coiler on the inside a few turns and when it starts to get tight put a screwdrive through it so it wont spin, put the rope in the hole and bring it out and tie a knot. the turn it gently to release the screwdriver and let it coil the rope back in

To maybe convert your Flamethrower back to a generator, Make sure the fuel line is a good quality thick rubber material (like OEM )since it passes through the engine,HEAT is a issue, if it has been modified to steel, or it's thin rubber, it will overheat the fuel on its way to the carb and cause backfires after the engine warms up , ( vaporizing gas and pressure bypassing the jets flooding the engine) I use 1/4 inch Goodyear sold at Autozone , one of very few name brand quality parts you can get there. The other possible cause is carbon deposits built up on the leading edge of the valve not allowing the valve to close all the way, just clean the valve, it is caused by too lean or rich carb setting or clogged jets, if it is a newer style carb with a pink main jet then debris in this area will always cause backfire, check and make sure the old tiny O-ring on this jet is not still in the bottom of the shaft, people forget to pull them out all the time or give up trying to pull them out, I use a paper clip and bend the end 1/8 of a inch @ 90 degrees to fish hook it out of there, CLEAN THE SHAFT with carb cleaner and a Q-tip.... A Tecumseh engine will always backfire if the carb or airflow is not perfect and sealed tight !!!!!! it looks simple to rebuild the carb but you must take your time and look close, clean it very well, make sure the jet is SEATED properly and all tiny holes are clean, use guitar string not torch head cleaners as they will enlarge the holes and make your carb run rich.