I have installed the engine and the Ross prsu on my plane but I am having
hard time finding a starter to fit the gearbox.

Does anyone here know what model starter will most likely fit my gearbox?
My is a 2:87 to 1 ratio, I believe.

I do appreciate any help.    Thanks

Ramon

That is a good question. There are two popular Mazda rotary
starters that might fit. The 12 tooth and the 13 tooth.
The 12 tooth has the solenoid mounted on a 45 degree angle
and that is the most recent I suspect. The 13 tooth is
an earlier version and less common. The solenoid is mounted
on a 90 degree angle. The Ross looks like
it uses the earlier 13 tooth version. In any event you
should be able to mount either one with a bit of surgery
on the Ross bell housing. There are minor differences
in the mounting.

You might try calling Dave Atkins in Puyallup Wash.
He has tons of used rotary parts.

Paul Lamar

Ross machined the stock starter housing to fit his gearbox, I will
look around here and see if I can find the one that was on my gearbox
but it may not do you any good as it seems like Ross never made two
gearboxes the same.
Ken Welter