Step 1: HIGH ALTITUDE OPERATION OF YOUR OUTBOARD MOTOR
Your outboard motor is equipped with a carburetor that is designed for proper engine operation at various altitudes up to 5000 feet (1500 meters) elevation. If you operate your outboard motor at higher elevations, the change in air pressure may affect the standard carburetor air-fuel ratio and could make the engine run too rich. This could decrease engine performance, increase fuel consumption, cause difficult warm starting, and may cause an increase in exhaust gas emissions.
If the outboard motor will be operated continuously above 5000 feet (1500 meters) elevation, the jetting should be changed to the appropriate high altitude specification that is available from Authorized Suzuki Marine dealers. If you need to apply these parts to your outboard motor, Suzuki recommends that you have them installed by an Authorized Suzuki Marine Dealer, or a qualified service professional.
If you operate an outboard motor at low altitude (below 5000 feet (1500 meters)) when the engine has been modified for high-altitude operation, the engine could be damaged from overheating, or there could be excessive exhaust gas emissions.
The jetting must be restored to the standard specification if the outboard motor is to be operated at elevations below 5000 feet.
An action for the purpose of installing or modifying altitude components and performing other changes to compensate for changing altitude is not considered a prohibited act under federal law (40 CFR 1068.101(b)) as long as it is done consistent with Suzuki’s instructions.
Step 2: OVER-REVOLUTION LIMITING SYSTEM
This motor is equipped with a revolution limiting system which activates when engine speed exceeds specified r/min. as mentioned below.
| DF4A | 5100 r/min. (min–1) |
| DF6A | 5850 r/min. (min–1) |
Over-revolution can result from cavitation when turning hard, a propeller with a slipping bush or worn-down blades, or a trim setting that is too high.
If the over-revolution limiting system activates, the motor will exhibit a rough running condition and you must immediately reduce engine speed to within the recommended operating range.
If the Over-Revolution Limiting System activates at recommended maximum throttle and you are sure that the propeller pitch is sufficient and there are no factors like “over-trimming” or “ventilation”, there may be a problem with the Over Revolution Limiting System.
Consult your authorized Suzuki marine dealer if the Over-Revolution Limiting System activates for no apparent reason.