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I have a 2008 Toro Z5000 riding lawnmower. All of a sudden it won't keep running. It starts no problem with the choke open, but as soon as you pull back on the throttle it stalls out. Any ideas? The air cleaner looks fine, also fuel filter. Gas seemed OK.
By johnmcronin from Burlington, VT
Look for a sticking valve in your carburetor. Try spraying it down with carb cleaner. Sounds like youve got a needle sticking open, and it cant compensate with the fuel, flooding itself out.
You know what that means, your lawnmower flywheel has electromagnets on it and when a safety switch is not engaged in correlation one magnet is not "on". Check your seat, mower, and transmission in neutral, those switches could be the culprit.
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My riding mower will start on choke, but when I try to accelerate the mower cuts off. I have cleaned the gas tank and put in a new gas line and filter. I have also put in a new air filter, taken the carburetor off and cleaned it. Does anyone have any more ideas?
Try checking the ignition and the governor. (09/22/2005)
Your gas tank cap is probably dirty and plugged, with it plugged it creates a seal, stopping the gas flow to the carburetor. That is why it will only run with the choke on. So check your gas cap on the tank and clean it. (09/22/2005)
Check the flywheel key, spark plug, and lead going to spark plug. You might check the muffler for oily deposits or obstruction. You can remove the muffler and if it then runs OK replace muffler. Make sure that fuel line isn't kinked.
You said you cleaned carburetor, yet you may have to put in a new kit. Check the carb float for proper setting. Check fuel cap breather hole for obstruction. If all of above are OK, check compression. You may have to overhaul the engine.
I've had to clean carburetors more than once before and make sure that all small holes are cleaned really good. Take a sharp pin or needle and clean them out. Make sure there isn't any rust on the flywheel. Make sure the needle valve in carburetor is moving freely. Make sure governor linkage isn't bent. Good luck. (09/23/2005)
There are 3 things you need for a motor to go: spark, compression and petrol. If there is spark at the plug rule that out. If there is compression then check the petrol if it goes when choke is out, but not when accelerating. It sounds as if it is a blockage. Is there a filter built into the carburetor? I found this out on one of my mowers on the weekend. Check the jets as they could be blocked and also that the main needle if it has one, isn't jammed. Hope this helps. Brent (10/31/2005)