My friend starts his big engine. It's a huge one cylinder diesel engine with hot bulb ignition. It uses crude oil, or just regular diesel. The torque is enormous from the two big flywheels. In this video there is a problem with the two check valves. After checking them and cleaning them carefully, the engine runs very good. Here is a video after the check valves was fixed, and the engine run as it should:    • One Cylinder 40 HP Hot Bulb Crude Oil...