Troubleshooting Poor Engine Performance
How do I troubleshoot poor engine performance?
Many engine performance problems can be linked to maintenance issues such as stale fuel, dirty air filter, fouled spark plug, and deteriorated oil.
A great way to help avoid these problems would be to perform an annual tune-up using a Briggs & Stratton engine Maintenance Kit.
If this is the problem:
Ask this question:
If the answer is yes:
Is the engine emitting white/blue smoke?
Is the engine emitting black smoke?
Is the air filter plugged?
Are any shrouds or cooling fins missing or broken?
Install new parts as needed.
Is the fuel mixture too lean?
Is the fuel tank vent or fuel tank screen plugged?
Does the combustion chamber contain excess carbon?
Is the spark plug lead faulty?
Spark Plug Misses Under Load
Is the spark plug fouled?
Is the spark plug faulty or gap incorrect?
Are the breaker points faulty?
Is the carburetor set incorrectly?
Is the valve spring weak?
Is the valve clearance set incorrectly?
Other troubleshooting sections that may assist you can be found in either:
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