Originally Posted by
aspeed
Being connected to the plane will be an understatement for a .61. You will know it is there fer sure. I think it is an SF .61. An FS is a four stroke usually. Anything over two strokes is just kinky.
This one is a two stroke. I just recently purchased it. It has a few miles on it but it spins well, the shaft does not feel bent. It is definitely a two stroke with rings and adjustable carburetor. It has OS Max FS cast on the side. Here is a photo from the previous owner
My plan is to use it on an RC Yak. My control line stuff is long gone.