Greetings. Recently picked up a 71 CB450. Garage queen with 15,000 on it if the odometer is right. Tested compression, and super low, about 65 on both cylinders. Adjusted the valves (tricky and weird). Three were a little tight, exhaust on the left side had the mark on the adjusting screw 180 degrees out. Compression is a bit better, now about 90 on both sides. Seems likes a top end rebuild might be in order. Can anyone recommend a good shop in the SoCal area?