Oil only dampens piston vibration and controls movement of piston during acceleration and deceleration. Thicker oil enriches acceleration and leans deceleration. Thinner oil leans acceleration and enriches deceleration.
Spring and weight (added to piston) affect height of piston at each RPM. More weight or stronger springs keep piston lower than norm at an rpm. This restricts air flow but causes more depression and draws more fuel however the annular puddle of fuel around the needle is also reduced with lower piston height so the extra fuel added by the depression is not linear. Simply lowering the jet or shaping the needle may accomplish adding more fuel w/o the restriction of doing it with a heavier spring or heavier piston.
One wants the piston to rise to maximum height to minimize its airflow restriction but I'm not sure if it should be at max torque or max hp. (I would guess at the max torque point). Once the piston maxs out, all rpms above will draw more fuel as the depression increases in magnitude (more suction on the annular fuel puddle). I'd like to map this stuff someday. Cptn. Obvious and I had planned to do this but I moved from his neighbourhood too early. A few months with an engine dyno would allow for making math models for these adjustable parameters.
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