It's possible that the valve is a little sticky. I just used a wire wheel on my cordless drill to clean the valve and seat. I did set the lash when I had to replace my broken valve but I didn't worry too much about lapping them. They are designed to hold the exhaust valve open slightly to make them easier to start, but then you can't really do a compression test on them because of this. If it isn't at least firing, it might be more than the valve. Being a pointless ignition, there's probably not much you can do for timing. It could just have weak spark? I don't have much experience with these since both of mine have been converted.
By end of week I should be in the 1450 club.
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