Reply To: Johnson QD fuel consumption

[rudderless]

A lot of the issue is throttle cam shape.  A lot of older motors have a lot of  throttle with respect to timing advance.  Not recommending this but I have slowed the throttle ramp up by reshaping the throttle cam.   The motor at same output will have less throttle opening with more timing.   Keep in mind that might lower the effective lubrication at lower speeds as less fuel will be consumed.