Cure for sticking valves. Kohler 7000

[over70pirate]

My Kohler 7000 motor bent 2 pushrods, because of sticking valves.
Was able to unstick 1, but other still returns slowly. Any ideas? Without removing head.
Also is Seafoam or Marvel Mystery Oil recommended? Or something else.
Mower is 3 years old. Bought it last year. Not sure of hours, but everything looks like low hours.

 

[chemman]

You could try some Berryman B-12. It will dissolve most varnishes.

 

[over70pirate]

You could try some Berryman B-12. It will dissolve most varnishes.

Think it would be better than carb/choke cleaner? Just to free up, not in gas!

 

[chemman]

Yes. You can get the B-12 in a spray can form as well as the pour it in whatever can.