I'm having a lot of trouble figuring this one out. It's a two cylinder propane engine.
The machine came in because the #1 cylinder's spark plug wire was ripped out, so the ignition coil was replaced. After starting it up and richening the fuel mixture at the regulator (it was set too lean to start), I heard it running on only one cylinder.
The #2 cylinder valve cover and exhaust manifold was cool to the touch after several minutes of running. I popped the valve cover and checked valve clearance, which was within tolerance (.009" for intake and exhaust). I changed the spark plug. I installed a new coil. Coil gap is .015".
The engine will run when only #1 spark plug wire is attached, but will sputter, backfire, and quickly die when only #2 spark plug is hooked up. Pressure in #2 cylinder is at 140 PSI.
I believe this machine had a new #2 cylinder head installed a few months ago.
This one has me stumped. It's getting fuel, it's getting air, it's being compressed, there's spark. I'm not really sure where to go from here. The only thing I can think of is maybe the gasket around the intake manifold was damaged when the head was installed and it's sucking air, throwing off the mixture.
I'd appreciate any input you guys can throw my way.
EDIT: Forgot to mention the plugs are gapped at 0.032"
The machine came in because the #1 cylinder's spark plug wire was ripped out, so the ignition coil was replaced. After starting it up and richening the fuel mixture at the regulator (it was set too lean to start), I heard it running on only one cylinder.
The #2 cylinder valve cover and exhaust manifold was cool to the touch after several minutes of running. I popped the valve cover and checked valve clearance, which was within tolerance (.009" for intake and exhaust). I changed the spark plug. I installed a new coil. Coil gap is .015".
The engine will run when only #1 spark plug wire is attached, but will sputter, backfire, and quickly die when only #2 spark plug is hooked up. Pressure in #2 cylinder is at 140 PSI.
I believe this machine had a new #2 cylinder head installed a few months ago.
This one has me stumped. It's getting fuel, it's getting air, it's being compressed, there's spark. I'm not really sure where to go from here. The only thing I can think of is maybe the gasket around the intake manifold was damaged when the head was installed and it's sucking air, throwing off the mixture.
I'd appreciate any input you guys can throw my way.
EDIT: Forgot to mention the plugs are gapped at 0.032"