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I have replaced the spark plug and the breather. It is a craftsman electronic ignition, 11 HP.

There are a couple of things this could be. The most obvious is that gas is not getting to the engine in the proper fashion. This could be water in the gas, or a bad filter or kinked hose and more.

Another thing is that the spark plug is not firing consistently. That could by your electronic ignition.

Something I'm not as familiar with came from a website:
If the engine starts fine but stops suddenly, the most common problem is a sheared flywheel key. The flywheel key is designed to break when the mower blade hits a hard object. This feature protects the crankshaft and engine components from damage but it also renders the mower inoperable until you replace the flywheel key. You can replace it yourself or take it to a mower repair shop, but before you do, also check the mower blade. It may be bent from the impact. Never use a bent or damaged mower blade.

Check the exhaust pipe for grass or debris blockage. Clean out debris with a dowel or other instrument. Also, check the muffler for rust or damage. A sure sign of a damaged muffler is an extremely noisy engine. Many universal replacement muffler kits are available.

If the mower vibrates excessively as you operate it, stop immediately. Turn off the engine and disconnect the spark plug. While wearing gloves, check the blade for damage or balance. If the blade is out of balance, remove it and use a file to sharpen the heavy side until proper balance is restored. Replace the blade if it is damaged.

I don't know if this is applicable to your riding mower.

Finally, but less likely, there is a limit switch malfunctioning somewhere. For instance, most riders have a switch on the seat so when you get up the engine or the blades stop. There are other limit switches as well. If you get it to start and don't change anything else, the limit switches don't sound like the problem unless they are malfunctioning.

Hope this helped and good luck

2007-05-25 07:33:23 by tjolacy

Home-made robot lawn mower. Barbie Jeep + control system + blades amp; motors. Uses buried wire (electronic dog fence), bumpers, and flaps for ...

i have a sabre by john deere it has a 16 hp twin cam motor ohv. ok i have been putting starters and solenoid switch on this thing for years! i took it to get it repaired and the guy just rebuilt the carb and such, i picked it up a month later and it still does the same thing! it drags it will not jump off anymore it goes 1 rotation and locks up ! but if i take the plug out it spins freely with no problem i put the plug back in and it locks up again! yes new battery, it has electronic fuel pump! i kinda seems to me that it might have a timing problem? or the exhaust valve is not opening or something? has anyone ever had this happen or even have a clue what is going on?????? please any help will be grateful

What year is this engine? Have you checked the flywheel key? If you put the plug in and it locks up it would mash the end of the plug in, is there a gap still in the end of the plug? You can take out the plug and with a flash light look in the plug hole and turn over by hand and see if valves are turning. If need more help email me and see if we can figure it out. shawn_ribble@yahoo.com. Small Engine Mechanic as a Hobby.

2009-09-04 18:33:38 by da8man2004