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INSTRUCTIONS FOR O.S. MAX 61 VF ENGINE. The O.S. MAX-61 VF is a high performance engine that has been developed expressly for FAI type R/C contest models. HOW TO PROPERLY SET YOUR O.S. PUMPER ENGINE'S CARBURETOR. These instructions describe the proper procedures for adjusting the carburetor of the followingSAFETY INSTRUCTIONS AND. WARNINGS ABOUT YOUR O.S. ENGINE. FEATURES OF FX SERIES ENGINES, BEFORE. INSTALLING THE ENGINE. BASIC ENGINE PARTS. Manuals and User Guides for O.S. engine MAX-61FX. We have 2 O.S. engine MAX-61FX manuals available for free PDF download: Owner's Instruction Manual