OS FS70 Surpass
08-16-2017, 08:31 PM
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OS FS70 Surpass
I have an old OS FS70 Surpass that doesn't have a head gasket. Should it have one? (I don't think it is the surpass II). It runs fine, but it doesn't have much compression and when flying, the rpm's are about the same at half throttle and full throttle.
