Tracy,

I recently switched from pre-mix to OMP on my 3-rotor.  The 20b OMP
uses a stepper motor instead of a lever.  The stepper motor controls a
plunger which regulates the amount of oil injected for a particular
load.  I removed the stepper motor and built a plate with a 1/4-20
screw for adjustment.  I have it adjusted so it injects 1 oz of
2-stroke per gallon of fuel burned.  It uses Richard Sohn's OMP
adapter connected to an external reservoir.

On a side note, I contemplated using a 13b pump (using the 13b OMP
adapter), but it is a smaller pump.  I was concerned that it may not
have the pumping capacity to supply a sufficient amount of oil for the
3-rotor.  So, I went with the heavier 20b OMP.

Also, I fabricated new steel lines from off the shelf brake line
material purchased from O-Reilley's AP.

Mark

On 11/28/12, Tracy <rwstracy@gmail.com> wrote:
> How have you guys using the OMP adjusted the injection amount?   Have you
> found it good enough to set it to maximum and just let the engine rpm vary
> the amount?   If not,  about what percentage of the adjuster lever travel
> did you end up with and what oz per gal of fuel did that equal?
>
> Any info appreciated!
> Tracy
>
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