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I have a unique problem mowers runs great when i first start it but if i shut it off will not start again for maybe 2 hours. then starts up and runs great agin i change the ignition module and no help.
I rechecked the gap check the wires and check for a spark i have a spark and still would not start after it's hot. changed gas, installed a new gas filter still would not start, even sprayed quick start no luck, disconnected the seat safety switch no help check fuses all good air filter new still would not start. after an hour or so starts up runs well as long as i don't shut it off i'm ok but i need to put it on a trailler to do another lawn but need to wait a few hours to start it again. any thougts????
 

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I don't have any suggestions for ya RK, but did want to say Howdy and Welcome aboard. Hopefully someone may be along that can offer some help.
 

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:MTF_wel: try this take the air cleaner filter out open the choke. thottle open wide try and start it sound like it flooding just a guess let us know
 

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My neighbor has this problem with his. He tries to start it with the choke on, won't start will just flood, then wait hours to restart. has to start it about half throttle. Mines just the opposite, wont start ever without the choke, even after hours of running, still needs choke to start. Have you tried both with and without it
 

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I am with Joe, I have heard of coils opening up when hot. Seen it quite often on old Harleys.
 

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I had the same problem with my Honda Izy, Started fine from cold but didn't run properley or start back up once hot. Turned out the carburettor was full of gunk and mess. Got it all cleaned out, works good as new again.

So i'd say whip the carb off, take it appart and look for build up of 'varnish' (v.thin layer of black-ish brown-ish film over everything) and generall muck, the whole thing should be 100% clean and shiney. If you're unsure there are pleanty of videos on cleaning carb's up on U-tube and similar sites...and pleanty of guys on here who'd prob be able to give you more specialised advice

Dave
 

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I'll be watching this thread,seeing my "Yard-Man" with a 20 HP Kohler Magnum vertical twin does much the same thing often..but not always--mowed with it over an hour yesterday till I ran it out of gas,and it only stumbled once ,like it was going to stall,but only because I think it was about empty..I'd hate to waste 100+ bucks on a coil and the 4 hour labor to install it,and find out it still acts the same..

Mine still has spark after it dies,and sometimes choking it will get it to start and run briefly,so will adding gas to the carb sometimes..but it always dies less than a minute later--seems once it starts this crap,letting it sit overnight is what cures it best--then you can run it anywhere from 10 minutes to
sometimes all day,before doing it again,and it runs perfectly until the fault occours..

I'm hoping to have one of My Suburbans fixed and the deck on it,so I can mow with THAT next time..might sell the MTD or part it out,I've gotten a lot of hours use out of it and it owes me nothing!..got at least 6 other tractors to play with,and need room!..
 

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just had this problem with what I thought was a PERFECT running tractor, turns out the carb had a bad float needle and sometimes would seal right sometimes wouldn't. Would have never figured it out if it didn't leak gas in my garage when it finally didn't seal right enough to cause it to flood over the breather tube. I was leaning towards valve adjustment, but it was just a bad float needle. I'd check the carb.
 

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carb kits are cheap and easy. If you're going to spend the time to do it once then get a kit and do it permanent. Takes less time to take it apart once then twice if you find it wasn't just dirty but had a bad needle valve or seat or leaky float...been there...done that many times on old cars and mowers. Took a varijet on my daughters push mower apart twice last year due to surging before I noticed a stretched bolt hole in the diaphragm.
 
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