Craftsman 247.377300 5X65RU motor

[bizzs]

Hi everyone, I am a first time poster. My son purchased a craftsman lawnmower 247.377300 and it has a 5X65RU motor. He bought it at a private sears hardware store that closed out and lost the receipt. The regular local sears store will not honor the warranty unless he produces the receipt.

The problem with mower is that its a non choke and supposed to start on first pull. After 10 or more pulls, it fires up cold and will run. When he shuts the motor down to empty the bag, it will not fire up. I sprayed some carb cleaner in it and it still will not fire up. I am a mechanic, but not good with small engine repair. I have a spark plug tester and the spark looks good. Any suggestions? Does the problem appear to be fuel or something electronical? Any help or guidance would be appreciated..

Thanks
bizzs

 

[mechanic mark]

https://www.briggsandstratton.com/n...nemanuals.html?searchrequested=126t02-0521-b1

see page 9 in operators manual & adjust valves, intake 0.005- 0.007 exhaust 0.007-0.009

https://www.google.com/search?sourc...ves on b&s engine&aqs=chrome..69i57.31365j0j8

 

[ILENGINE]

I would start with trying a new plug. Depending on type of spark tester can give false positives. If that doesn't work, then go changing the fuel, and then to cleaning the carb, If that doesn't get it try varying the gap on the ignition module. Possibly could also be partially sheared flywheel key, so may want to check that.

I have run into all the situations I have listed on the MTD branded engines at one time or the other, all with the same symptoms that you are listing.

 

[bizzs]

thanks guys I will use your words of wisdom and get back to you with my findings.

 

[bizzs]

Ok guys here is what I did and the motor is still doing the same thing. I disassembled the carb and cleaned, cleaned the gas tank and replaced filter. Replaced spark plug and adjusted coil. The ground wire is in tact and is working properly. The motor fired up and ran good and I shut it down after a minute run. It would not restart again. I sprayed some starting fluid in the carb and still no start. I can see spark through my tester. I left the air filter off and one observation that I seen was a slight spit backfire coming from the carb when it was running.

My son told me last night that this mower was a customer return to the private sears hardware store that went under and it was resold to him at the closeout sale. My son became the proud owner for 80.00 and was informed that the warranty was good so he decided to buy it (lol)

Any recommendations for my next step? Is it possible that the coil is bad since it will not start using starting fluid?

thanks
bizzs

 

[ILENGINE]

May need to do a compression test after you run it and then shut if off and it won't restart. Compression is suppose to be 55-85 psi.

 

[bizzs]

May need to do a compression test after you run it and then shut if off and it won't restart. Compression is suppose to be 55-85 psi.

I did the compression test and the results were 100 psi when the engine was cold. I started the motor and let it run for 10 minutes and shut it down. I tried restarting with negative results. I took another compression reading with the motor hot and the result were 102 psi.

Comments please?

Thanks
bizzs

 

[BlazNT]

You have a carbon canister under engine cover find it and check to see if it is clogged.

 

[bizzs]

Canister is clean. I adjusted the valves to 0.006. It starts up but is chugging like it is starving for fuel. All of a sudden it kicks in and the idle goes high and then it smooths itself out and runs great. When I shut it off, it will not start again. The plug is clean and not fouled out. I try starting fluid and still no start after I shut it down. Any thoughts? Coil?

thanks
bizzs

 

[bizzs]

I made a youtube video. https://youtu.be/wgFCJG_6Mgc

Any thoughts?