Twin-Cylinder Gasoline Four-Stroke Engine INSTRUCTION MANUAL FG-57T
NOTICE All instructions, warranties and other collateral documents are subject to change at the sole discretion of Horizon Hobby, Inc. For up-to-date product literature, visit www.horizonhobby.com and click on the support tab for this product.
SAFETY INSTRUCTIONS Introduction Congratulations on purchasing a Saito™ 4-cycle gasoline engine. When cared for properly, these high-quality, finely crafted engines offer many years of modeling enjoyment. This instruction manual has been developed to ensure optimum performance from the Saito gasoline engine you have purchased. Saito gasoline engines are adapted from similarly sized glow fuel engines and are designed with an emphasis towards high performance, durability and weight savings.
2 SAFETY INSTRUCTIONS anything that can ignite. • Always ensure the aircraft is secure and will not move once the engine is started. • Always rebind your transmitter to your receiver(s) after setup and before first flight. • Always ensure the throttle failsafe is set to low throttle in your transmitter. • Always perform a range check prior to flight.
IGNITION SYSTEM Disassembly Do not needlessly disassemble your Saito engine. Only qualified individuals should perform engine repairs. Damage due to improper disassembly will not be covered under warranty. Engine Parts Identification It is important to be able to identify the parts of your Saito engine. In the back of this manual you will find an exploded view of Saito twin-cylinder gasoline engines, as well as a chart which includes part numbers and descriptions.
4 SUPPORT EQUIPMENT Support Equipment The following items, which are not included with your Saito engine, are necessary in order to operate the model engine: 1. Fuel. For maximum protection and longevity of its engines, Saito recommends a fuel containing a 20:1 gasoline to oil ratio. We recommend a synthetic based oil such as Evolution Oil (EVOX1001Q). High octane fuel is not needed for this engine. 2.
ENGINE MOUNTING CAUTION: Never use your bare fingers to start any model engine. This could lead to injury. There are a variety of electric starters on the market. The Hangar 9® PowerPro™ H-D 12V starter (HAN162) will work perfectly on all of the twincylinder gasoline Saito engines. Engine Mounting When mounting the engine please note that the carburetor of the engine extends beyond the mounting pads of the engine mount and this requires the use of at least 1.
6 P R E PA R I N G Y O U R E N G I N E Preparing your engine The first run on any engine, whether 2-cycle or 4-cycle, is critical to the future of the engine itself. During this time, metal mating parts (piston and cylinder, ball bearings, etc.) settle in. Care must be taken that the engine is clean and free of any dust or grit that may have accumulated while building the model. There are two accepted methods for breaking in a new engine: test stand mounted and run or aircraft mounted and run.
S TA R T I N G T H E E N G I N E 7. Because it is more difficult to set the needles of a 4-stroke engine than a 2-stroke engine by ‘ear’, we highly recommend the use of an optical tachometer (HAN156) when attempting to set the needles of any 4-stroke engine. 8. Make sure you use a fuel filter between the fuel tank and the engine. Also make sure you use filtered fuel in the fuel tank. How to choke your Saito Gasoline engine equipped with the Saito/Walbro Carburetor.
8 ENGINE BREAK-IN 4. Engage the electric starter for about 5 seconds and the engine should start. Manually starting the engine CAUTION: Use a starting stick or leather workman’s gloves to protect your hands. 1. Turn on the transmitter, and then turn on the receiver switches. Position the throttle stick to the fully closed position. 2. Check that the ignition system is turned off. 3. Insert the choke bar through the carb and engage in the rotating barrel of the carb. 4.
CARBURETOR ADJUSTMENTS peak setting followed by richening to cool. Do this about 10 times throughout the course of this tank of fuel. 5. Leaving the high-speed needle in a peaked condition, check your throttle response, going from low to high and back, gradually lengthening the duration of high rpm. Continue the break-in process until you can get a stable high rpm for at least one minute. At this point the ground break-in is complete.
10 N O R M A L E N G I N E O P E R AT I O N bogs down during the transition, then the idle is too rich and needs to be adjusted leaner. If during the transition the rpm increases quickly, the idle is likely too lean and needs to be adjusted richer. Continue working in this manner until you are satisfied with the slow transition from low to high rpm. 5. Once you have completed the slow transition adjustment now is the time to check how the engine reacts to a fast throttle transition from low to high speed.
ENGINE MAINTENANCE compound before attaching the two parts together. This will help to keep these parts tight and help prevent any leakage from occurring. 6. The propeller nut and the exhaust locking nuts should be tightened when the engine is hot. Engine Maintenance NOTICE: DO NOT NEEDLESSLY DISASSEMBLE YOUR SAITO ENGINE. ONLY QUALIFIED INDIVIDUALS SHOULD PERFORM ENGINE REPAIRS. DAMAGE DUE TO IMPROPER DISASSEMBLY WILL NOT BE COVERED UNDER WARRANTY.
12 TIPS FOR EXTEDED ENGINE LIFE cylinder in Saito engines elongates more than the valve and the clearance gets larger as the engine heats up. Therefore, in cold conditions the clearance should be virtually zero. After several hours of running the occasional check of the tappet clearance can be performed quite easily. Once the engine is cool set the engine up as described above (intake closed and at top dead center) and check to see if you can slide the included feeler gauge (0.
TROUBLESHOOTING Troubleshooting 13 Generally speaking, there are very few things that will keep today’s modern gas engines from starting. To that end, make sure you’re using good quality “fresh” fuel, you have a fully charged ignition battery, and good spark plugs installed. Should the engine fail to start after these items are verified, refer to the troubleshooting chart below.
14 PA RT S L I S T Twin Cylinder Gas Cross-Reference Chart TWIN CYLINDER GAS CROSS REFERENCE CHART ITEM 01 Cylinder, Left 02 Cylinder, Right 06 Piston 07 Piston Pin 08 Piston Pin Ret 09 Piston Ring 10 Con Rod 11 Linked Con Rod 12 Conrod Linkpin/Scr 13 Con Rod Screw 14 Cyl Screw Set 15 Crankcase 19 Breather Nipple 20 Frt Ball Bearing 21 Main Ball Bearing 22 Rear Ball Bearing 23 Crankshaft 24 Pinion-crankshaft 25 Pinion gear pin 26 Collar, Crankshaft 27 Tapered Collet & Drv 28 Prop Wash/Nut 29 Prop Nut Spi
PROPELLER SELECTION Propeller Selection Below you will find a propeller selection chart. This chart will enable you to select the best propeller for initial setup of your Saito engine. 15 Remember, it is imperative to balance each propeller prior to installation onto your Saito engine. Failure to do so may cause unwanted vibration in your aircraft.
16 PA RT S L I S T
WA R R A N T Y & R E PA I R S 17 Warranty and Repair Policy Warranty Period Exclusive Warranty- Horizon Hobby, Inc., (Horizon) warranties that the Products purchased (the “Product”) will be free from defects in materials and workmanship for a period of 3 (three) years from the date of purchase by the Purchaser. 3 Year Limited Warranty Horizon reserves the right to change or modify this warranty without notice and disclaims all other warranties, express or implied.
18 WA R R A N T Y & R E PA I R S Damage Limits HORIZON SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCT, WHETHER SUCH CLAIM IS BASED IN CONTRACT, WARRANTY, NEGLIGENCE, OR STRICT LIABILITY. Further, in no event shall the liability of Horizon exceed the individual price of the Product on which liability is asserted.
WA R R A N T Y & R E PA I R S 19 and phone number where you can be reached during business hours. When sending product into Horizon, please include your RMA number, a list of the included items, and a brief summary of the problem. A copy of your original sales receipt must be included for warranty consideration. Be sure your name, address, and RMA number are clearly written on the outside of the shipping carton. Notice: Do not ship batteries to Horizon.
20 WA R R A N T Y & R E PA I R S Please call 877-504-0233 with any questions or concerns regarding this product or warranty. Consumer Warranty and Repair Policy Saito engines are guaranteed against workmanship and manufacturing defects for a period of 3 years from the original date of purchase. This warranty is limited to the original purchaser of the engine and is not transferable.
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Copyright 2011 Horizon Hobby, Inc. Saito is exclusively distributed by Horizon Hobby, Inc. Saito is a trademark of Saito Seisakusho Co. Ltd, Japan. Evolution is a registered trademark of Horizon Hobby, Inc.
