Re: what did you do to your motorized bicycle today?
Back to the subject, I got in a straight plug head from bgf to replace a angle plug head. The angle head doesn't seal good because of the raised small sealing area, if I sand that area off the squish band will be almost gone and compression will probably be too high for pump gas. I'm going to cc both before I start to see the difference. The new head has a nice squishband that after lapping it should be better.
Your results may not be the same,Greg