RE: sig 4 star 60 WHICH ENGINE?????
In reading all these posts so far, the Tower 75 and the GMS are Half brothers. Are essentiall the same engine except the Tower is ABC whereas the GMS has a Dykes ring.
The Tower 75's at my field have run fine.
There's a ARF at the field with a Saito 72 that seems to get along just fine.
My ARF has a OS91 Surpass I on it.
Enjoy,
Jim