Cub Cadet walk behind mower kick back during start

R

rjack

Forum Newbie
I have a 6 year old Cub Cadet mower with a 173cc vertical shaft engine. It kicks back strongly when I try to start it. I removed the flywheel to check the woodruff key which is not sheared or twisted so the bad timing is not being caused by that. Anything else I can adjust or check?
 
rjack said:
I have a 6 year old Cub Cadet mower with a 173cc vertical shaft engine. It kicks back strongly when I try to start it. I removed the flywheel to check the woodruff key which is not sheared or twisted so the bad timing is not being caused by that. Anything else I can adjust or check?
Click to expand...

Valve lash. It has to be right for the compression release (if it has one) to work right.
 
cpurvis said:
Valve lash. It has to be right for the compression release (if it has one) to work right.
Click to expand...

Many thanks. I finally got a chance today to check the valve lash which was larger than it should have been, particularly on the exhaust valve. Set it up and bingo, the thing now runs like a top.
 
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