OutdoorKing Repair Forum Forums Restoring, Customising and Modifying Tech Talk Briggs & Stratton OHV intek 60

Yes, return spring was broken.
I have removed and reshaped it to work again.


My understanding of how it works, so far........ is
Would appreciate other opinions.

During starting it is in the rest position as above, notice the tang is proud of the exhaust lobe (rear).

This tang pushes on the exhaust lifter to bump the exhaust valve during starting.
As below


Once the engine is running does centrifugal force act against the spring to lift it above the lifter??? I was going to put the cam shaft inside a drill chuck and run it to see if that happens. It makes sense to me, as then engine would have full compression at speed.

Delete this post if I am way off the mark here.

As another example see below camshaft for a Quantum engine. (the tang is broken or worn on this one)