Finally, back to the engine work on the CB450. Way back when, after not getting any satisfactory compression test readings(yes valves were checked), I decided to take the engine apart instead of simply reinstalling it as I had hoped. While apart, I'm replacing the valve seals and lapping the valves to the seats and honing cylinders and replacing piston rings as well as all gaskets. Luckily I found a write-up on line re: putting the valve train back together as I was unclear where/how all the 1973 double over-head cam valve train parts went. The basement nook, with good lighting and warmed by the wood stove, is an excellent space on a cold winter day.