Question about Tecumseh Horizontal Tiller Engine 8 Hp, 1" X 2 57/64" Shaft, Modelno. Hm80 - 155656x

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Tecumseh HM80 on coleman generator. won"t stabilize, backfires. new plug, fresh gas 'carb cleaned. starts first time'new air filter. any suggestions?

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Tecumseh carbs a MAJORITY of the time can not be cleaned, they MUST be replaced 9 times out out ten. Backfiring is due to too much fuel, not enough air mixture. If you have removed the carb and used carb cleaner with the carb and still no luck, then buy a NEW carb. Tecumseh are bad for this , I do hope this helps!!

Posted on Apr 12, 2012

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Tighten the flywheel nut to at least 100 ft. lbs.

Posted on Mar 28, 2009

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I dont know if this is a solution..but i had the same issue with my generator from the time it was new. I just put in a new carb kit and the issue went away... it looked like the main jet on the bottom of the bowl was a little different

Good Luck

Posted on Mar 19, 2009

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Check to see if it has a smeared or worn key way it is what times the fly wheel to the engine if not it is possible that it coul have problem with a valve or engine timming

Posted on Mar 01, 2009

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I have a Tecumseh OHH55 on a wood chipper. I replaced plug, oil, new fuel and cleaned up. I cannot get it to start. Carb was also cleaned. Any suggestions before I take to a repair shop.


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?

Aug 09, 2014 | Tecumseh Horizontal Tiller Engine 8 Hp, 1"...

1 Answer

8 hp tecumseh on coleman generator not running at a constant rpm (galloping)


The carburetor is hunting for the right balance because it is dirty. You will have to remove it to clean it thoroughly. That is the proper way to resolve it, but if you may want to try to add a carburetor fuel injector fuel additive to the tank and run it out. It may help to stabilize the hunting when the engine is under load. The only way to see is to try it, if you are not ready to tackle a carburetor. I have seen this trick work on my lawn mower engine. It greatly minimized the problem on my engine. Keep in mind the ultimate fix is the rebuild of the carburetor.

I hope this helps.

Aug 05, 2011 | Tecumseh Horizontal Tiller Engine 8 Hp, 1"...

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Our HMSK 80-110 electric start snowblower starts up right away, but the idling is very rough. It runs very smoothly when it is engaged in snow throwing.


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!

Jan 14, 2011 | Tecumseh Horizontal Tiller Engine 8 Hp, 1"...

1 Answer

Tecumseh 17.5 hp ohv engine won't start


check valve clearance. if ok you going have change carb.sometimes i rebuild a carb everthing seam ok but carb wont work right so i have get a new carb and it works fine evertime

Jul 20, 2009 | Tecumseh Horizontal Tiller Engine 8 Hp, 1"...

1 Answer

Tecumseh HM80 engine, new carb, won't run


Not the solid state ignition. If this were the problem the engine wouldn't start at all. There is some adjustment needed to the carb but without more info, I'm not sure what.

Jun 17, 2009 | Tecumseh Horizontal Tiller Engine 8 Hp, 1"...

1 Answer

Mower ran fine but was outside for ayear covered now it will not


Leaving a mower outside for an extended period will often allow water to get inside the engine (even covered). Try removing the plug and drying out the cylinder (compressed air blown into the cylinder usually works.) With the plug still removed pull the cord a few times andf try to get the piston to stop on the bottom so you can blow out the entire empty cylinder. I usually then put a squirt of WD-40 in the cylinder (not too much) and pull the cord a few times....then reinstall the plug and fire it up.

If that doesn't do it, try the WD-40 in the muffler (a couple short squirts)...also make sure the air filter is clean and dry...I would try to start it without the filter installed to see if that is the problem (just don't allow it run more than a few seconds without the filter).

Jun 13, 2009 | Tecumseh Horizontal Tiller Engine 8 Hp, 1"...

1 Answer

Hard to start and backfires from muffler when running


Sounds like the timing may be off or maybethe exhaust valve maybe hanging open.

Mar 15, 2009 | Tecumseh Horizontal Tiller Engine 8 Hp, 1"...

2 Answers

Backfire Tecumseh Generator


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.

Jan 08, 2009 | Tecumseh Horizontal Tiller Engine 8 Hp, 1"...

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