Small Engines (Lawn Mowers, etc.)/tecumseh engine


Tecumseh 8 hp model#hmsk80 155692v engine surges up and down.mounted on snow blower.acts as if its getting too much air.removed carburetor cleaned and blew everything out put new needle and seat in.removed and cleaned jet on side of carburetor. ask advice from local lawn mower shop.reassembled and still surges up and down and wont idle. could carburetor be bad

Could be a bad carb.  You can purchase China made carbs on Ebay for less than $20.00.

I would check a couple of other items before ordering a carb.

First, make sure the intake gaskets are sealing as well as the manifold gaskets if you have manifold.  You can use some Permatex #2 non-hardening on the gaskets to make sure they are sealing.  You only need a little Permatex and use rubber gloves to apply a thin layer on both sided of the gaskets.  The #2 is some messy stuff and hard to remove.

Second, check the head bolt torque.  200 inch pounds.  I've seen some head bolts loosen and lean causing the engine to run lean.

Finally, before ordering a new carb, dis-assemble again and clean again.  I have had to clean carbs 2-3 times before they started working right.

Let me know if this helps.

Small Engines (Lawn Mowers, etc.)

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Eric A. Jones


Lawnmower Repair . Certified Master Service Technician from B&S. Have 23 years experience on B&S, Lawn Chief, Weed Eater, Echo, Peerless, Wheel Horse, Snapper, Atlas, MTD, McCulloch, Homelite and many other numerous brands. Specialize in electrical repair.


Born and raised in the midwest. Started tinkering with engines when I was about 14 on my Suzuki RM-80. I began lawn mower repair at a small hardware store. I knew absolutely nothing. I read lots of repair manuals and met an older fellow who taught me many lessons. I continued working on small engines through high school and paid my way through college working on mowers at the same hardware store. Decided to get away from the midwest and mower repair so I joined the Air Force. I repaired air traffic control electronic equipment and ended up in Hawaii where I got a part time job at Small Engine Clinic. I gained a lot of experience from the Small Engine Clinic and had a blast repairing small engines. I then took the Briggs and Stratton Master Service Technician test and earned my MST. I then traveled to Wisconsin where I attended the factory update training seminar and received formal training. Continued working on mowers part time as I completed 20 years of military. Retired from the military on a Friday and continued in the lawn and garden industry the next Monday.

MAS Aerospace Operations BA Mathematics AAS Electronic Communications AAS Electronic Technology

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