ORIGINAL: w8ye
All you need is just the cylinder. These were changed because the old one was damaged.
But The old valves are peened over at the stem tips and this has to be honed away before sticking the old valves in a new cylinder.
I have three of the early model and then two of the gas engines
Thanks for the good information. Have you been able to make a comparison between the two different heads? I don't plan to change the cylinder because my motor appears to be very new but
I'm curious if the "B" makes more power.