This is my first model engine. It is easy to be critical, that's not my intention. Slightly disappointed, several issues... 1. The high-tension spark plug lead was too short for the sled. I needed to cut and join a section in the middle, under the sled. 2. The auto centering shim on the governor flywheel did not grip the crankshaft. I needed to pack the shim to gain enough pressure to finally grip the shaft. 3. The glass oil cup for the piston leaks at the joint to the block. It needs a seal. I fixed it with thread tape. 4. The crankshaft counterbalance weights were poorly finish. They needed fine filing to remove excess metal from the edge. It is running and a joy to watch. As I say this is my first model engine, maybe these issues are normal...? Trevor.