I have been struggling with 2 problems that I have pretty much figured out.
1. Cold starts--- I believe I have found the problem here, I had been thinking the primer was OK because when the engine was running and I pushed in the key it would kill the motor. However I reciently discovered if I used a spray bottle to put a shot of fuel in the carbs before starting my cold start problems went away. So at this point I did a little experimenting. I unplugged the primer hoses and cranked the motor with the key pushed in. I got no fuel from the primer at cranking speeds. I rebuilt the fuel pump with and got the same results. I think I have determined there is not enough compression in the crankcase to run the fuel pump.
2. A lack of power with the throttle down. I think although it is getting fuel at running speeds I suspect the fuel flow is weak due to the fuel pump problems.
So I started checking out where my problems might stem from and I discovered the lower left cyl has just 60 psi compression. I decided to tear it down and rebuild it. I just started and the first thing I did was remove the heads to look at the cyls. The lower left has some scoreing so I proceeded to start removing the various parts so I can pull the powerhead. When I removed the fuel pump I got an idea I put a straw into the hole where the fuel pump gets its compression and blew cigarette smoke through the straw. The smoke comes out along the left side of the lower left piston not at the bottom where the scoreing is. Would this point to a broken ring?
Another question, does crankcase compression from the lower left cylendar drive the fuel pump or is it crankcase pressure from all cyls that drive the fuel pump? And does it sound like I am on the right track?
1. Cold starts--- I believe I have found the problem here, I had been thinking the primer was OK because when the engine was running and I pushed in the key it would kill the motor. However I reciently discovered if I used a spray bottle to put a shot of fuel in the carbs before starting my cold start problems went away. So at this point I did a little experimenting. I unplugged the primer hoses and cranked the motor with the key pushed in. I got no fuel from the primer at cranking speeds. I rebuilt the fuel pump with and got the same results. I think I have determined there is not enough compression in the crankcase to run the fuel pump.
2. A lack of power with the throttle down. I think although it is getting fuel at running speeds I suspect the fuel flow is weak due to the fuel pump problems.
So I started checking out where my problems might stem from and I discovered the lower left cyl has just 60 psi compression. I decided to tear it down and rebuild it. I just started and the first thing I did was remove the heads to look at the cyls. The lower left has some scoreing so I proceeded to start removing the various parts so I can pull the powerhead. When I removed the fuel pump I got an idea I put a straw into the hole where the fuel pump gets its compression and blew cigarette smoke through the straw. The smoke comes out along the left side of the lower left piston not at the bottom where the scoreing is. Would this point to a broken ring?
Another question, does crankcase compression from the lower left cylendar drive the fuel pump or is it crankcase pressure from all cyls that drive the fuel pump? And does it sound like I am on the right track?