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My scr 621 cub cadet will not start smoke comes from carb and exhaust when I pull cord

Will not start smoke comes out of carb and exhaust when I try to start it

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Posted on Jan 02, 2017

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SOURCE: My cub cadet src 621 has been difficult to start

If its ripping you arm off the timing is off. Check the flywheel key it is more than likely sheared off. Pull the cover and look down on the flywheel and you should see this.Your unit is not clear to me so whatever unit you have check the timing and when its right it will not pull your arm off.Good luck.

Posted on Mar 25, 2009

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SOURCE: I have a cub cadet lawn mower broken pull cord

just rewind the spring starting with the outer end and fill it back into unit. I always have the rope extended and rewind it back in and reinstall

Posted on Jun 07, 2009

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SOURCE: Cub cadet ltx 1045 wont start, no spark.

remove the top cover from the engine and remove the small wire from the coil if still no spark the coil is bad

Posted on Aug 15, 2012

SOURCE: Cub Cadet SRC 621, won't start. New spark plug, cleaned carburetor and air filter, Whiffs of smoke occasionally

Sounds like a sheer flywheel key. Common on the SRC 621. Kawasaki motor, correct. The flywheel key is under the recoil. Pull the flywheel and check the key. A very small key is there. Breaks and puts the engine out of time

Posted on Oct 18, 2012

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Sounds like a sheer flywheel key. Common on the SRC 621. Kawasaki motor, correct. The flywheel key is under the recoil. Pull the flywheel and check the key. A very small key is there. Breaks and puts the engine out of time

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My cub cadet src 621 has been difficult to start since the headgasket was replaced. In fact pulling the starter cord is not only difficult it sometimes kicks and almost rips your arm off. Why is is so...


If its ripping you arm off the timing is off. Check the flywheel key it is more than likely sheared off. Pull the cover and look down on the flywheel and you should see this.Your unit is not clear to me so whatever unit you have check the timing and when its right it will not pull your arm off.Good luck.

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