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Magnum Engines XL 91 RFS Blue R/C 4-Stroke EngineProduct Review (submitted on October 18, 2010):
Dave, Please call the Magnum Service Center as I am sure we can help. The 91 has great reviews and many of our guys are flying. Its a great engine. When you call, please provide to our tech the glow plug type, engine mount location, and any other info you deem important. We look forward to helping you.
I recently purchased two Magnum XL 91s and they were not what I had expected from Magnum. I have about 10 Magnum engines in various sizes. I purchased the 91 4-stroke to replace an 80 4-stroke hoping it would have more power and speed. I mounted it on an airplane designed for a 46 2-stroke. Boy was I disappointed at the lack of power the 91 4-stroke had. I mounted the other on a Camel designed for a 61 2-stroke and again I was very disappointed at the power. I even flew the planes several more times to give the engines time to break in and still not very much power. I also tried different props to see if that helped but not much difference in performance.
I will still buy Magnum engines but not another 91 4-stroke.