Unit try's to pull rope from your hand when you try to start..back fires...checked shear key (not sheared)..checked push rods and valves valves are free...
Assuming that the engine has not been taken apart and timing is set correctly. Have seen this often. Usually valve adjustment. Adjust valves as per manual so that compression release is working. If compression release is not working after adjustment check for faulty cam.
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Back firing could be an ignition, or valve timing issue, also check the function of the anti fire solenoid on the bottom of the carb float bowl ( you should hear this click as the ignition is switched on) you can also remove it and watch the centre pin retract when the ignition unit is switched on, next thing to check is that the flywheel key has not sheared, this will involve removing the flywheel, failing this remove the rocker box cover and make sure both valves are moving freely as the engine cranks, it could be a stuck valve.
If you have proper timing, compression, gas and a spark, the engine should fire/run. Have you tried a spritz of starter fluid to see if it fires ? The flywheel could have sheared the key and affected timing. About the last thing I can think of is valve adjustment, specifically the intake valve, although I think it would be difficult to pull the crank rope if that's the problem.
Two possibilities here, either the blade bolt is loose ( the blade is used as a flywheel so needs to be tight ) or the flywheel key has sheared knocking the ignition timing out.
I have seen some issues with these machines shearing the flywheel key ( it is an alloy key part of the flywheel ) if the key has sheared it will knock the timing out and will now require a new flywheel.
Two things to check here, check the blade is tight, it acts as a flywheel so needs to be tight, second, check the flywheel key has not sheared as this will cause the engine to kick back as the timing will be out.
The flywheel key could be sheared. This is a problem that occurs if you have hit anything with the blade. It usually takes quite a hit to knock out the flywheel key. Here is a video to help you replace the flywheel key.
Sounds like you have two problems. One the flywheel brake is not being released completely and second the flywheel key has been sheared. It is why the rope is being jerked out of your hand. The mower is out of timing and when the spark plug fires before it is suppose to, it jerks the rope out of your hand.
your flywheel key has sheared, please pull your flywheel and replace your key, you can buy them at your auto parts store for 50 cents, I hope this helps you
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