Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Hello, and thank you for choosing Just Answer. My name is***** will be happy to assist you. Will your engine start up and run briefly, if you spray a small burst of carburetor cleaner, directly into your carburetor?
This will leads me to believe that our problem could be ignition related. Have you checked for spark?
Keep in mind that an engine needs three things in order to start up and run. Fuel, Spark, and Compression. If your engine will not start, after you spray carburetor cleaner into your carburetor, then this leaves Spark and Compression to question.
Have your son to confirm spark first. Do you know what valve settings he used?
Ok. Have you tried a new spark plug?
Ok. Did he say if he noticed spark to your spark plug, when he was checking it?
These are only troubleshooting questions.
I would for you to get your son to confirm two things for me. Then you and I will have a good starting point, to continue from.
Ask him about the spark, and ask him if he allowed his piston to go 1/4" past Top Dead Center, before adjusting your valves.
Thanks! You will get a link in your email, that links you directly back to me.
This will be fine. Thanks for letting me know.
Thanks for letting me know.
If your battery is good, and you are 100% sure your valves are properly adjusted, then this leaves two very good possibilities. Either your starter is bad, or the compression release mechanism on your cam gear has failed.
You will need to either swap starters with another mower, that you know is working properly, or get someone to test your starter for you. If your starter is good, then it is very likely that your cam gear will need to be replaced.
A new cam gear can cost of to $100.00
You will need to remove your engine from your mower in order to do it. It is not too difficult.
Video - Click Here
Video 2 - Click Here
I attached a link to two videos that will give you an idea of what has to be done, when replacing your cam gear.
You are very welcome! I am not aware of a way to accurately check your compression release. Usually if your starter and battery is good, and your valves are properly adjusted, you can rest assured that your compression release is bad, if our problem still exists.
Is your mechanic referring to your crankshaft, or cam shaft?