Small Engine Troubleshooting Problems? Ask a Mechanic Now.
If you have attempted to start after spraying with starting fluid, and still not start, would check for spark. If you have spark, and spray fluid into it, it will fire for a moment if it is something else. Check for spark at plug(s) and let me know the outcome.
If you have spark at the plugs, and it doesn't fire up when manually inserting fuel into cylinder, you will most likely have either a compression issue or it is firing at the wrong time or weak spark