Nothing new about any of this Hazzaman, I think with worn rings the bore expands slightly and the worn rings just can't create enough compression.

Hi Max,
I had a GCV160 Honda that was giving me big kickback problems on a 24 just as bad as the PT's do. I'm not sure if they lightened the crank on the GCV's but all I can think of. I fought it for a few days trying to add weight to it but couldn't hold them tightly enough in position so ended up pulling the motor off, put it on a standard Victa base and out the door. The bloke sent me a text a few days later saying he was happy with the mower and how well it ran. What I don't understand is why I don't have kickback problems with the Deutschers apart from the bigger ones with the cam issues