I have a Magnum 61 4-stroke and it's one of my most reliable engines in my squadron. It has never quit, stuttered or left me with a heart palpatation during flight. Only had to adjust it once and never again. You will like the engine. I plan on transferring mine to a Citabria in the spring. You will also get very long flight times as this engine sips fuel.

I also have a Magnum 80 that's a nive little powerhouse but it's definitely heavier than the 61. Your 61 will fit just about any 40-46 sized airplane and has a similarly sized mounting pattern.