I always thought that the 24 needed a decent pull to get the blade disc spinning. They kick because they fall backwards on the last compression stroke then they fire trying to run backwards hence the violence. Mine only does it when flooded.
I'm sure the belt does not slip
Too tight if anything.
Why? Beats me. My brother reckons just to hold the rope nearly right out tightly after pulling seems to help but ours is not that bad.
Maybe try an FC decompression valve. They should screw in OK.
Keep at it Norm. We need a fix for this one
Jeff