Four strokes only
Topics
[1] OS 40 Surpass FS vs Saito FA-40a
[2] bore up-sizing an OS FS-40 into a 56!
[4] Magnum .52a
[5] My "new" Magnum XL 91 cubic inch 4-stroke.
[6] Four stroke for a Nobler ARF?
[8] OS FS 26 Surpass - Fuel Tank Setup
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