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Due to the high torque of the FZ91 engine, we have equipped it with double . 0.04-0.1mm. YS FZ91. OPERATOR'S MANUAL. Tube(A). High Speed Needle. 25 Mar 2010Central Hobbies has parts for your YS 91-AC YS engine as well as other engines from YS. We are the top distributor of YS engines and YS YS 91-AC parts and View and Download YS 91ST operator's manual online. 91ST (Helicopter Engine). 91ST Engine pdf manual download. This deals with the YS91AC but applies to all the YS engines. Run the motor rich to The YS engines require that the instructions be followed in the manual. Glow Engines - YS-91AC 4 Stroke Users Manual - Good evening everyone, Do any of you have a copy of the Users Manual for the YS-91 AC 4 YS Engines - Manuals 120SRX.pdf · 91SRX.pdf · 60SR.pdf 120sr.pdf · 91SRS.pdf · 91SR.pdf · 91ST.pdf · 61ST2.pdf · 56SR.pdf · 50ST.pdf Has anyone got a PDF they could post or PM me? The YS engine web site only has the PDF for the new YS-110 engine. What I really need to Practical rpm. 2,000 ~17,000. OPERATOR'S MANUAL. 91SR (Helicopter Engine). FEATURES. The 91SR is the latest in helicopter engine technology from YS.