Small Engines (Lawn Mowers, etc.)/Smoking out exhaust


I have a 16hp tecumseh on a cub cadet lawn tractor. As soon as it starts to get warm smoke starts coming out the exhaust.At first its just a little but then it really pours out that i have to shut it off. The head gasket was bad in it so i did change that but it still did the same thing. Can you give me some ideas please.

What is the engine compression?  Did you perform a cylinder leakdown test to verify the condition of the piston, rings and valves?

If the head gasket was bad dust/dirt may have entered the cylinder and caused the rings to wear.

Does the oil smell like gasoline?  Is the oil thin and runny?  What weight of oil are you using?

Let me know.

Small Engines (Lawn Mowers, etc.)

All Answers

Answers by Expert:

Ask Experts


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

©2017 All rights reserved.