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what i originally wrote the post about. initially it would malfunction only after 45 minutes of running great. It would die when the PTO was engaged and i would try to move or turn. This morning it did the same, just as soon as I started it instead of after an hour of mowing. No, I did not...

I was wondering. Did I knock something loose during all that cleaning? Something clogging a jet? Is the float sticking? I put stabilized fuel in it every fall and run it enough to get it into the engine, shut off the fuel and let it die. It has had nothing but premium fuel since day one...

Well,,,,,,,,,. Crap! Trouble starting. Won't stay running. Have to use choke to start every time. Finally warmed up enough to stay running without choke, and, did what it has been doing all along. Except, it does it right out of the gate. So. Is this the working theory? The swollen...

all fuel lines replaced. New filter. Yes, I got the arrow facing the right way. There was no fuel at the carburetor line. I think it was old swollen lines. After cranking for a minute fuel is in the filter again and all cylinders are firing. I got done too late to do a full hour test...

ok. appreciate all the help. I have a few questions. So, the plan at this point is to replace all the fuel lines and filter. Filter is pretty new and still clear, but I have another one. I did notice this morning that the fuel filter was empty before start up. Is this normal? It's not the...

I will double check fuel lines and filter. Yes I cleaned the fins after reading your signature. I'm willing to double or triple check anything. I have 2.5 acres of yard to mow. thanks Doc

Thanks slomo. let's take your ideas one at a time. New in line fuel filter. When it first started this I thought the same thing. I also visually checked the clear filter each time it malfunctioned. Same level of fuel and filter is still clean. If it is fuel starved, why wait until it has...

GRRRRRR!!! Both cylinders are working full time. BUT! The original problem still persists. After about 30 minutes of mowing, it did the same thing that caused me to write in . With the PTO engaged and moving the engine will lose power and almost die. IF I disengage the PTO it will settle...

Great ideas slomo! I did do some of them with the old coil.

I found a pair of modules\coils at a good price. They should be here saturday or sunday, or Monday. I will update this post after I install and adjust the new parts. Here's hoping. Doc

Thanks slomo. If the one side is too close will it prevent it from producing spark?

This is what I discovered today. The tester came in the mail a day late. The right side cylinder is the one that is not firing. I placed the tester on the wire as instructed and there was no spark at all. To double check my ground, I checked the other cylinder. There was good spark on that...

@ Tiger Small Engine, your idea worked perfect. It was how I determined the cylinder that was not working.

ok. fairly certain I have located the proper tool. on the way. Be here tommorrow. thanks

ok auto doc's. all I have is the bulb type. You attach it to the plug and then the plug wire. Not reliable? OK . I will order the other one. Do happen to have a link or good description of the tester?

ok gang. Finally had time to check out your suggestions. One of the cylinders is not firing. Hard to believe that a 2 cylinder engine would still run smooth after dropping a cylinder. Anyway, we have a diagnosis and now what it the treatment plan? Remember I am a doctor not a mechanic. lol...

nice tool. wish I needed one enough to justify cost. Haven't forgotten the other tests. Waiting for the 4 days of forecast rain to pass. Then it's Easter. I will get back to you.

Thanks. I will check these out and reply.

Kubota 125s with Kohler 740 engine and 54" deck. 2017 model 253 hours. This started last season. After about an hour of operation the engine will lose power when I have the blades engaged and I make a sharp turn or go up hill. Normal engine lugging in heavy grass. The real power loss is...