9.9 to 20 hp parts

[KKBoater]

I recently changed the flame arrestor and seal which greatly improved getting on plane and speed. I did not replace the ECU. Is this important? I've seen posts stating that a new ECU is needed AND some that say the new ECU is not needed. I don't want to damage the motor. Thank you for your replies.

 

[William01]

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Not your family of engines but it might work in your case

 

[Tommy2t]

The ecu controls the max RPM which i think is 6000 on the 20hp it also controls the fueling., Different part #'s so i would think it is necessary.

 

[dmw]

I recently changed the flame arrestor and seal which greatly improved getting on plane and speed. I did not replace the ECU. Is this important? I've seen posts stating that a new ECU is needed AND some that say the new ECU is not needed. I don't want to damage the motor. Thank you for your replies.

Have you had any issues not chaning out the ECU? Does it ever run hot or rough? Thanks!