Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Hi, my name is***** will be assisting you.
You have indicated that you have good spark and you are getting fuel to the plug since it is wet. What is the compression on the engine like? Have you checked the flywheel key? On this engine the flywheel key could be sheared and 90 degrees out of time but the ignition will still fire to the spark plug every time that the flywheel magnet passes by the ignition coil. It is not like the old point style engines that would not fire if the flywheel key was sheared.
What happened leading up to all of the parts replacement that caused you to replace the carburetor, ignition coil. Was the engine running prior and died? Fill me in on a little more background about what happened prior.
I assume that the last time it was working it was running okay? You shut it off and now it won't restart.
You have verified that it has good spark and that you are getting fuel to the plug, the only other thing that could be an issue is the compression. If the compression is too low it will not fire. Odd however that you weren't having issues before.
Do you have access to a compression gauge?
Since it is on a generator that can be misleading because you are having to turn the rotor on the genset which does have some resistance as well.
You indicated that you were getting spark to the plug so I wasn't concerned with any grounds in the system. The only thing that I was concerned with is the flywheel key due to the fact that if it is sheared you will still get spark but just not at the right time in order to start the engine. Everything else can seem fine, you are getting fuel since the spark plug is wet.
If the compression were too low it would not fire. This engine would normally run around 60PSI compression, if it fell to let's say 35PSI it is not likely to fire. You might get an occasional pop if you pulled the rope enough times.
I am going to opt out of your question which will allow for one of the other experts here to add any suggestions that they might have. I believe that you are dealing with one of two issues but maybe someone else has a different suggestion or thought on your problem.
I concur with Jon, with spark plug being wet with fuel, and having good spark, and getting nothing . I think you are going to find your compression is too low to fire the cylinder. The valves may be too tight and are leaking, but to adjust, you have to remove the valves from the block and grind off the ends, to get clearance.