How to do-it-yourself instructional on basic tune up of Tecumseh mower engine. Demonstrates troubleshooting a fouled spark plug and solving by increasing operating speed. Today on Repairs101 I’ve got my ten year old mower on blocks and I’m going to show you how to pim it out. just kidding. You don’t have to block yours up as high as I did. put it up on a couple of bricks or on the edge of your workbench. first thing I’m going to tell you but not show you is “Run it dry”. I run it dry every time. pull the sparkplug out pull the wire off, push it aside. socket wrench easy, spin it out have a look. quite clean some blackness but no large deposits. the insulator around electrode in centre, not cracked, Inspect insulator, here’s the insulator. That’s the electrode. sparkplug is blackened, a bit fouled. most likely cause overfuelling/ rich fuel condition. Reasons for a blackened spark plug include things like too rich fuel mixture or sticking choke or clogged air cleaner, anything going to increase the fuel in the fuel : air ratio. good possibility is oil seeping past the rings on the compression piston and getting up into the combustion chamber and fouling it. quick compression test had the sense to hold onto literature came with lawn mower ten years ago spark plug thirty-thou. thirty-thou nothing wrong with gap. Clean it up with a soft wire brush reuse it. looked around online find specifications for this engine. new machine make about eighty psi Sixty psi is generally agreed …
Video Rating: 5 / 5
@repairs101 I see, it makes more sense to me now, thank you.
@dragoon2784 – The carb sprays fuel into the vacuum caused by the falling piston which draws in the air. The result is a fog of air with fuel droplets suspended in it. Too rich means too much fuel in the fuel:air ratio (opposit of too lean – too much air). The result is a blanket of black stuff made of partially burned fuel residue.
I added tension to the spring that controls the governor in order to allow higher speed operation. This is the only adjustment I know of for this carb set-up.
I need help understanding exactly you meant when you said your burning a little to rich? and your going to speed it up by adjusting that spring
I liked it so much I had to!
@kavo360 – What kind of engine? Mower? Automotive? Outboard? Flooded how? Fuel? Coolant? Sea water? Videos can take months to get to but I do try to field requests. Send details and please stand by. Maybe message me details if it’s urgent and I’ll try to provide some good advice.
can u make a video on how to repair a flooded engine.
The first engine I have ever pulled apart and put back together was a Tecumseh when I was 8. The engine was completely fowled up with carbon deposits.
@76ChevyC10 * 1st look for air restrictions. Kinks or obstructions? Air filter new? Throttle plate operating? Control cables stroking? Check fuel delivery. H2O in fuel? Fuel pump delivering to spec? What kind of service has it seen? High hours? Dusty conditions? Running without air filter? Maybe rings are worn. Compression test will reveal leaks. Leakdown test will pinpoint the leak. Look for smoke in exhaust when stalls. Check exhaust for restrictions. Check for EGR (operating OK?)Good luck.
Ok, I have a 17.5hp Briggs and Stratton lawn tractor I bought 11 years ago. It’s been having a problem like when I climb a hill it bogs out and hesitates a lot. I was wondering if the carburetor on it may need to be replaced or rebuilt? Because, I changed the fuel lines and filter and it didn’t do a thing. Any advice??
nice video very helpful
thanks