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Thank you for this detailed explanation, everyone has been so generous with troubleshooting tips. I've learned so much. The broke mower was given to me so I'm determined to fix it on my own. I will get back to troubleshooting using these tips once the weather clears up a bit.

Just tightening it up by hand with my 1/2" drive ratchet

I decided to get back on my mower project. It is now sheering the flywheel key once it starts up and runs a few seconds. I'm convinced something is broke internal.

Mfg. No: 31G777-0171-G5 is the engine number. Checked key way and it looks brand new I forgot to mention this earlier. So after I changed the magneto coil, the mower fired up and started running for a few seconds and then blew the main fuse. The reason it blew the fuse is because I had blown the...

Ok I will check the flywheel key again thanks

I replaced the magneto coil and now it is backfiring. Still want crank.

So a little progress, I changed the ignition coil and now it is backfiring like crazy, still not running. Any suggestions?

Here are the pics of the piston and magnet is at TDC and valve springs. The carbon build up looked normal, I cleaned it up a little. The cylinder had no wear. For some reason I still think it is flooding with the new carb. The cylinder was full of gas as I stated earlier. Could it be a timing...

Just finished pulling the head off, cylinder was full of gas. Seems like it is still flooding with the new carb. Cylinder, piston, head, valve springs all look good and valves are seating properly. I will adjust the valves tomorrow and finish putting it back together. I'll post pics of the...

So I did an oil and filter change, installed a new spark plug and then I installed my new Nikki carb and heard a few misfires (a small popping) and then a big backfire pop, big plume of white smoke came out the muffler. Still turns over fine but the temp is in the mid 30s so it doesn't take long...

Just letting you know where I am with this. I believe it is a carb problem and flooding. I ordered a new carb for $20 and going to give it a shot. When i pulled the plug out fuel ran out of the plug. I drained the oil and pulled the filter off and it had smelled like gas.

Interesting, I will check and verify tomorrow

no play inwards on the choke valve no spark with the coil kill wire unplugged, plenty of spark when plugged in to coil This is the position of the flywheel at the ignition coil at TDC

Good morning all, Still no ignition with small bursts of starting fluid. I checked the flywheel key way last week. I pulled it off and it looked brand new, no evidence of sheering. I will check TDC.

Hi Mr. Bert, Here is a pic of the valves from the other side as you suggested. They look to be the same height. I have also left a picture of the carb in full choke position and throttle position at low speed. I took the carb apart and checked everything. Carb looks brand new. There is no...

Thanks, I will check it out and take pic as soon as possible. This really means a lot, you are a great teacher.

Hi Mr. Bertsmobile1, I finally had an opportunity to look at the next steps of the troubleshooting process per your tips. I am enclosing some pics my findings. When the piston is closest to the head, the valves appear to be sitting at the same height. The magnet I assume is in the correct...

Thanks again, Ill take a look at these suggestions, yes it was several short bursts of starting fluid but I done it several times throughout the troubleshooting process.

Hi, thanks for the response. I sprayed a bunch of starting fluid in the plug hole and tried a new plug and still didn't hit. Sprayed it down the carb throat and also sprayed it into the intake valve. Also I checked the valves and they are moving in and out as they should. Valve clearance is...

Hello, I'm Working on this JD D100 riding mower, 17.5 HP B&S OHV for elderly neighbor. Neighbor was cutting his grass and then it cut off and will not start back. Engine turns over fine. Mower is 10 yrs old and has been serviced annually. 1) Great Spark 2) Getting plenty of fuel (removed hoses...