It possible snap its main rod if it freely spins no compression buy new motor
SOURCE: My mower surges. its a Murray, model number
first check to see if you have good clean gas in it. No water. if you have good clean gas. then I would recomend taking the gas tank off wich should have a plastic carburetor mounted to it. after that is removed and free of excess dirt. take the carb off there should be 5 phillips head screws. pull the carb off gently while observing just how it all goes back together. you may want to take pictures. you will find a fuel screen that you should take off and clean with carb spray. also there is a fuel pickup tube clean that also with carb spray. a couple words of caution if using compressed air Do not carried away with it. also same with the carb cleaner to much of it in rubber primers is not good.
SOURCE: craftsman self propelled walk behind lawn mower
Normally grass and debris are clogged under the belt/transmission cover, preventing the full engagement of the transmission cable/lever.
The cover is located on the topside, left front corner of the mower shell. Clean debris, try it again. If OK, re-install cover, If not, there is a cable adjustment (threaded portion with a nut on either side of a fastening arm) move the cable adjustment towards the rear, this will tighten the cable. Sometimes the cable assembly (includes the cable and the control box) needs to be replaced
I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae
SOURCE: I can crank my murray gas lawn mower 6.5 quantum
Sounds like you will need to clean your carburetor.
Sometimes you can get by with priming it a few times, and letting it
run a few times like that and it will flush the gunk out of the jets,
but most of the time you will need to rebuild the carburetor.
If the mower is over a couple years old, then I also recommend that you
buy and install a new carburetor repair kit, because the diaphragm will
get hard and that will cause it to be hard to crank.
When you clean your carburetor and remove the jet screws, count the
number of turns it takes to seat the jets from their original position.
That way when you go to put the jets back in, you know how many turns
they were in/out.
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Good Luck, I hope this helped
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