engine kickback

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  #1  
Old 05-23-07, 04:49 PM
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engine kickback

i have a 4hp craftsman mower and when i try to pull start it, the rope gets ripped out of my hands andim stumped. any help would be great.
 
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  #2  
Old 05-23-07, 05:13 PM
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Make sure the blade is installed and is properly torqued. A sheared flywheel key can also produce similar results.
 
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Old 05-23-07, 06:02 PM
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Do you know what a flywheel key is? And how to replace such? Did you recently strike a solid object with the blade? If so, the key is likely sheared and therefore the ignition timing is now off as well as a possible bent blade and worse yet, a bent crankshaft. Depending on the severity of the bent crank (if so), it may not be worth any further time or money spent on the machine.
 
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Old 05-23-07, 06:15 PM
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im not exactly sure what the flywheel key is. i havent got this mower to run yet, it was given to me last week
 
  #5  
Old 05-23-07, 06:30 PM
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First, remove the spark plug and tuck the plug wire away from the spark plug hole. Next, tie off the brake control bale lever. Next, tip the mower on its side at no more than a 45 degree angle with the muffler side up. Now, using extreme caution, rotate the blade by hand and see of the blade bolt wobbles from center. If so, this indicates that the crankshaft is bent and, again, depending on the severity, may or may not be worth proceding any further. Post back with your finding then we'll move on.
 
  #6  
Old 05-24-07, 05:31 PM
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its the flywheel key, its broken, ill fix it and see what happens thaaaaanks
 
  #7  
Old 05-24-07, 06:59 PM
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Since the flewheel key is broken,unless the flywheel nut was lose to start with most likely you hit something in the yard ((( real hard ))) and as puey61 pointed out your mower has a bent crankshaft.Or at the very lest a bent blade.Follow his instructions in finding which B 4 replacing the flywheel key on a mechine that might not even be worth it.
 
  #8  
Old 05-31-07, 03:45 PM
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spark

the blades turns straight. now the engine does not have spark. any ideas?
 
  #9  
Old 05-31-07, 04:30 PM
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Take the recoil cover off and follow the spark plug wire to the coil,clean the metal part of this with sand paper.Also clean the magnet on the flywheel.Re gap the distance between the coil & flywheel with a business card.Put the cover back on and try for spark.
If you dont have any,take the ground wire off and try again.If you're getting any spark this time,look for naked places in the ground wire that could be grounding the ignition system out.If no spark the coil is bad.
 
  #10  
Old 05-31-07, 04:38 PM
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How old is this machine? If it is old enough to have points and condensor then a sheared flywheel key (and it could be sheared again if you didn't torque the flywheel nut properly) will result in no spark. If it has no points (thereby a post-1985 or so machine) and you have no spark then follow Repair_Guy's instructions. Post back with the engine ID numbers and while you're at it provide the chassis ID numbers too.
 
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