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Angle of Engine Operation

What is the maximum recommended angle of engine operation?

The standard angle of operation limit for most small engines is a constant 15° angle under normal operation.

If the engine is permanently installed at an angle, oil fill and oil level checking provisions must be designed to maintain the required oil capacity in the crankcase.

If the angle of operation causes the fuel tank to be lower than the carburetor on a gravity feed system, fuel may not be properly supplied to the carburetor under load. In addition, the fuel level in the carburetor may become a problem as fuel seeks its own level in the fuel bowl. If the angle of operation exceeds 15°, the air bleed system and the fuel level in the emulsion tube may cause an extremely lean or rich fuel mixture. In most instances, carburetor function dictates the maximum angle of operation of the engine. Most engines operate satisfactorily up to an angle of 30° intermittently.

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