...

Sounds like the oil injector tubes Mike. They are connected to
a very very expensive (~$1500) stepping motor drive oil metering
pump. Not to worry. Mixing  one ounce of two cycle oil
with every gallon of gas is a far better solution anyway.
Just plug those holes with metric bolts.

Paul Lamar ...No rotor no motor.

Paul -

Wasn't there some discussion about using these oil injector holes for
getting a VERY accurate "manifold pressure"?

The idea of taking several measurements during the intake phase (and
averaging them) to get the effective manifold pressure sounds feasible,
and maybe even preferable (to those NOT injecting oil, anyway).

By measuring the "inner chamber pressure", the fuel injection system
will avoid all of the problems associated with intake variables (slide
vs. butterfly throttle, resonant frequency measurement errors, etc.),
and measure THE AIR PRESSURE IN THE ROTOR HOUSING.  Builders could slap
on any throttle they want, at any length, any diameter, etc., etc., etc.
More effective/efficient induction systems will simply result in greater
"inner chamber pressure", and result in more fuel injected.

Simple, no?