Question about Craftsman 21 Hp 42" Deck, Ys 4500 Lawn Tractor
Posted by Anonymous on
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Posted on Jan 02, 2017
did you hit something while mowing if that is the case then check the flywheel key. even if it only has a small nick in it that would keep the engine from starting up...good l uck
Posted on Apr 11, 2010
You likely need to get the valves adjusted,it sounds like the decompressor is not working.You need to get the compression down to 130 lbs while cranking or the starter can't overcome the compression.Try turning the motor past the compression stroke by hand and see if it will crank faster,if so then the decompressor is out of adjustment.If the decompressor is not just a lob on the valves then you need to call the repair depot for craftsman and find out what you need to do to fix the problem.If none of the above works then you may need a battery,or just clean the cables and battery posts.
Posted on Apr 19, 2010
It sounds like the carby is flooding badly. Check that the float needle in the carby is sealing properly. You need to remove the float bowl on the bottom of the carby and hold the float up with your finger and check that the fuel stops flowing out when you do this. Regards Phil
Posted on Apr 14, 2011
James, it is at the front of the engine. It is next to the 4" by6" metal cover that says OHV. It is on the right hand side ( sitting on the tractor), There is a black wire the size of a pencil ( diameter ), hooked to it. It is set deep in the engines cylinder head. There is a rubber boot over the end of the spark plug. Remove the rubber boot, you will hace to grip it hard and pull it off. Then you will be able to remove it, using a deep 5/8" socket with a 4 to 6 inch extension.
Hope this helps, if you need more let me know.
Posted on Dec 02, 2011
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