User manual YS FZ110S

[. . . ] Clearance adjustment should be done when the engine is cool. When the engine temperature is high, clearance is higher due to thermal expansion. The proper clearance setting should be at 0. 04-0. 1mm. The adjustment is achieved by loosing the locknut (FIG. 2) and turning the adjusting screw. [. . . ] When reinstalling the cam gear, the side with a point mark should be facing the opening of the gear box. Note that it should also be mounted with the point mark located towards the top of the engine just below the cam followers. Silicone rubber is used in many parts of the YS engine. Use only glow fuel or methanol for cleaning. Gasoline and other volatile solutions will damage the silicone if used. FEATURES The FZ110S is the most powerful 110 four cycle engine available. This engine offers many exclusive features that have been proven on other YS engines. Supercharged system with simplified structure to keep weight to a minimum while still retaining maximum efficiency. Air chamber that uses crankcase pressure coupled with a double throttle valve system which allows a bigger charge of fuel and air mixture to enter the intake valve for more power. Fuel injection system for superior throttle response. This system is unaffected by tank position or by the attitude of the model. PROPELLER INSTALLATION Due to the high torque of the FZ110S engine, we have equipped it with double locknuts for safety. Mount the propeller and tighten the rear nut. Next, tighten the front nut as shown in FIG. 1. Select a good quality propeller that will turn in the 8, 000 to 11, 000 rpm range. We recommend sizes 14x11-12, 15x10-11. LOW SPEED ADJUSTMENT This engine is equipped with a low speed needle valve to adjust the mixture from low to mid throttle. This needle valve is located on the side of the throttle barrel opposite the throttle arm ( FIG. 1). Open the low speed needle to 3 turns from fully closed position. The low speed needle valve should be set after the high speed needle valve has been adjusted. Close the throttle gradually to a idle(approximately 2300rpm). Let it idle for 20 to 30 seconds and then slowly advance the throttle. The adjustment is satisfactory at low speed if transition is smooth at this time. If the engine is running rough on idle, the low speed mixture is rich. If the engine starts to speed up and dies on idle or starts to detonate, when advancing the throttle, the mixture is lean. [. . . ] If performance deteriorates or a part fails due to a manufacturing error, YS will repair or replace the engine at no charge in the period of one year from date of purchase. Warranty does not cover normal maintenance. Should the engine be modified, incorrectly assembled or abused, there will be a nomal charge for parts and labor. The use of four cycle fuel due to the low oil content will also void warranty. INSTALLATION 1. [. . . ]