It works from 0 to 25% nitro

Idle on the 170 is 1500 and 175 is 1200!!

Prop is 20x10.5 top RPM 6000 to 8000(if recall correctly from the manual)

It is identical to the 170, but they went back to the old carburator without the needle for the cranckcase cooling.

Better termination on the hall sensor in the back plate, and the spark plug cap is bigger and better.

Regards

Alejandro P.