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This manual is for a YS FZ 120 (my engine has no Z and it'sthe closest manual I could find) and in capital letters under"Break In" it reads "DO NOT USE 4. FZ 120 Free operator's manual. The FZ120 was designed for the pattern competiton, scale and large sports With a few modifications internally, YS was able to generate more power. Ys F-120 Engine Manual Under, model engines YS, click on the instructions manual This manual is for a YS FZ 120 (my engine has no Z and it's the closestView and Download YS FZ120 operator's manual online. Supercharged. FZ120 engine pdf manual download. All available manuals and part lists for YS Engines. Documentation for YS Engines - user manuals, parts lists, instructions. FZ120 | Manual View and Download YS FZ120 user, service and care free manual online. Click on the instructions manual you would like to download for the model YS-FZ120 ℹ️ Download YS FZ120 Manuals (Total Manuals: 1) for free in PDF. Find more compatible user manuals for FZ120 Engine device. View online (2 pages) or download PDF (432 KB) YS FZ140-2 User manual • FZ140-2 Engine PDF manual download and more YS online manuals. YS FZ120 (01) PDF MANUAL. OPERATING INSTRUCTIONS. USER GUIDE – USER MANUAL. OWNER GUIDE – OWNER MANUAL. REFERENCE GUIDE – REFERENCE MANUAL.