* Engine Model: Briggs & Stratton makes a wide variety of 4.5 hp engines with different specifications. RPM can vary depending on the specific model number.
* Engine Load: The RPM of the engine changes based on the load it's under. A lawnmower engine will run at different speeds when idling, mowing thick grass, or going uphill.
* Governor Settings: Some engines have adjustable governors which control the maximum RPM.
How to find the approximate RPM:
1. Locate your engine model number: This is usually stamped on the engine housing.
2. Consult the Briggs & Stratton website: You can look up your engine model and find the manufacturer's specifications, which may include the approximate RPM range.
3. Check your owner's manual: The manual for your lawnmower should provide information about the engine's RPM.
General Estimate: Briggs & Stratton 4.5 hp lawnmower engines typically operate within a range of 2,800 to 3,600 RPM at full throttle, but this can vary depending on the factors mentioned above.
