™ Saito™ 4-Stroke Gasoline Engines Owner’s Operating Instruction Manual Model FG-14B & FG-20 Model FG-30 & FG-36 © 2010 Distributed exclusively by Horizon Hobby, Inc. 4105 Fieldstone Road Champaign, IL 61822 www.horizonhobby.com 17326 Printed 12/09 | Version 2009 Warning: • Do not modify any parts of the engine • This engine is designed for use with radio control model aircraft • I n case of modifications by the customer, Horizon Hobby Inc.
VERY IMPORTANT Failure to read and follow these instructions before you proceed to start your engine may result in engine damage and the voiding of your warranty. Table Of Contents Contents Included. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 I ncluded C ontents Contents Included FG-14B • Engine • Ignition (SAIG14153) • Engine Mount (SAIG1495) • Spark Plug 1/4-32 (SAIG20120) FG-20 • Engine • Ignition (SAIG20153) • Engine Mount (SAIG2095) • Spark Plug 1/4-32 (SAIG20120) FG-30 • Engine • Ignition (SAIG36153) • Engine Mount (SAIG3695) • Spark Plug CM-6 (SAIG36120) FG-36 • Engine • Ignition (SAIG36153) • Engine Mount (SAIG3695) • Spark Plug CM-6 (SAIG36120) SAFETY PRECAUTIONS Safety Precautions • Muffler (SAIG1474) • Muffler Manifold (SAIG8075B
6 F G - 1 4 B / F G - 2 0 E ngine M ounting Engine Mounting and Muffler Attachment Notes Figure 1 FG-14B = 14mm wrench FG-20 = 17mm wrench Photo is of the engine mount for the FG-20 Mount the FG-14B or FG-20 engine on aircraft-grade plywood with more than 6mm thickness or to a mount of equivalent strength, and firmly fixed, with 4 bolts. We highly recommend the use of the included Saito Motor Mount, SAIG1495B for the FG-14B, or SAIG2095 for the FG-20 to mount this engine to a model aircraft.
8 FG-14B/FG-20 Fuel FG-14B/FG-20 SPARK PLUG AND CARBURETOR F uel and I gnition system • M ix a ratio of gasoline to oil of 20:1for break-in and continuous operation on all engines. • A mixture of high-quality 91 octane unleaded gasoline and a reliable highquality 100% synthetic oil for 2-cycle engines must be used (we recommend Evolution Oil, EVOX1001Q). Note: • B e sure to use a gasoline-resistant type of fuel tubing (like Tygon).
10 F G - 1 4 B / F G - 2 0 B E F O R E S T A R T I N G Preparation Before Starting the Engine (prior to break-in) • M ount the engine on a strong, flat test bench or on the aircraft. (In either case, the engine should be secured so it is immobile.) • C heck to make sure the throttle barrel will open and close completely. • C heck the wiring of the ignition system to make sure it is connected correctly and securely. • M ake sure the fuel line is connected securely to the carburetor.
12 F G - 1 4 B / F G - 2 0 I ntroduction to 4 - S troke E ngines Note: We strongly urge the use of a tachometer to check rpm readings when breaking in the engine. After starting and warming the engine for 30 to 45 seconds adjust as follows. For initial break-in: do not exceed 4,000 rpm for the first 10 minutes of operation. This allows all the parts to mate properly with good lubrication. CAUTION: The engine must be stopped while you adjust the carburetor in order to prevent injury by the propeller.
14 F G - 1 4 B / F G - 2 0 S etting Setting the Needle Valves in the Gas 4 Stroke Engines F G - 1 4 B / F G 2 0 S etting the needle valves the N eedle V alves Use a Tachometer When setting any 4 stroke engine it is critical that a tachometer is used in setting the needle valves. It is near impossible to set them properly by ear. A good quality tachometer will go a long way towards improving your usage of these engines and make the experience even more enjoyable. Make the investment.
16 F G - 3 0 / F G - 3 6 E ngine M ounting Engine Mounting and Muffler Attachment Notes Figure 1 FG-30/FG-36 = 19mm wrench Photo is of the engine mount for the FG-36 Mount the FG-30 or FG-36 engine on aircraftgrade plywood with more than 10mm of thickness or to a mount of equivalent strength, and firmly fixed, with 4 bolts. We highly recommend the use of the Saito Motor Mount (SAIG3095 for the FG-30 or SAIG3695 for the FG-36) to mount this engine to a model aircraft.
18 F G - 3 0 / F G - 3 6 Fuel • M ix a ratio of gasoline to oil of 20:1for break-in and continuous operation on all engines. • A mixture of high-quality 91-octane unleaded gasoline and a reliable highquality 100% synthetic oil for 2-cycle engines must be used (we recommend Evolution Oil, EVOX1001Q). Note: • B e sure to use a gasoline-resistant type of fuel tubing (like Tygon). DO NOT use any silicone rubber type of fuel line to the engine or in the fuel tank.
20 F G - 3 0 / F G - 3 6 B efore S tarting Preparation Before Starting the Engine (prior to break-in) • M ount the engine on a strong, flat test bench or on the aircraft. (In either case, the engine should be secured so it is immobile.) • C heck to make sure the throttle barrel will open and close completely. • C heck the wiring of the ignition system to make sure it is connected correctly and securely. • M ake sure the fuel line is connected securely to the carburetor.
22 F G - 3 0 / fg - 3 6 starting the E ngine restart the engine with the throttle at a fast idle position. • I f the engine still will not start, unscrew the spark plug and check its contacts. Clean any possible excess fuel (an indication of engine flooding) and screw it in again. Further starting should only be done with the throttle at idle position. If the plug is dry, probably not enough fuel has been drawn into the carburetor.
24 N ormal operation and General Operating Procedures TROUBLESHOOTING GUIDE maintenance (to ensure the long life of the engine) • Do not operate the engine with a “lean” mixture. • R egularly check all screws and nuts on both the engine and muffler. • A fter 1 to 2 hours of operation, valve adjustment may be necessary. Adjust the valves as shown in the Engine Maintenance and Valve/Tappet Adjustment Sections. • T he Saito engines are equipped with a “breather” nipple.
26 V alve / T appet G ap A djustment Valve/Tappet Gap Adjustment After approximately one hour of operation, tappet gap adjustment may be necessary. When you check the valves, lubricate the moveable parts. Also make sure the screw is in tight before making adjustments to valves. Adjust the valves to a clearance of .03mm to .10mm (.002 to .004 in) using the supplied gauge. The valves must be adjusted with the engine cold due to thermal expansion.
28 F G - 1 4 B / F G - 2 0 D imensions and S pecifications FG-14B Dimensions and Specifications FG-20 Dimensions and Specifications FG-14B Outside Dimensions (mm) FG-20 Outside Dimensions (mm) SPECIFICATIONS Disp: 13.8cc (.82 cu in) Bore: 29.0mm (1.14 in) Stroke: 20.4mm (.80 in) Weight: (Engine only); 18.6 oz (528 g) Weight: (Muffler only): 2.1 oz (58 g) Weight: (Ignition only); 5.2 oz (146 g) Total weight with muffler and ignition system: 25.
30 F G - 1 4 B / F G - 2 0 P arts L ist Saito FG-14B/FG-20 Parts List F G - 1 4 B / F G - 2 0 E x ploded view Saito FG-14B/FG-20 Exploded View # DESCRIPTION QTY # DESCRIPTION QTY 01 Cylinder (left) 1 42 Piston 1 Rocker Arm Screw and Nut (42-1,42-2) 2ea 06 07 Piston Pin 1 43 Rocker Arm Pin 2 08 Piston Pin Retainar 2 44 Rocker Arm Bracket (Left) 1 45 Rocker Arm Bracket (Right) 1 46 Valve (In and Out) (46-1, 46-2) 2 47 Valve Spring+Keeper+Retainer (47-1,47-2,48) 2ea 48 Va
32 F G - 3 0 / F G - 3 6 D imensions and S pecifications FG-30 Dimensions and Specifications F G - 3 0 / F G - 3 6 D imensions and S pecifications FG-36 Dimensions and Specifications FG-30 Outside Dimensions (mm) FG-36 Outside Dimensions (mm) SPECIFICATIONS Disp: 29.1cc (1.80 cu in) Benchmark Propeller: APC 17 x 6 @ 8700 SPECIFICATIONS Disp: 36.3cc (2.20 cu in) Bore: 36.0mm (1.41 in) Practical Ground RPM Range: 1,700–9,000 Bore: 38mm (1.49 in) Stroke: 28.6mm (1.12 in) Stroke: 32mm (1.
34 F G - 3 0 / F G - 3 6 P arts L ist Saito FG-30/FG-36 Parts List F G - 3 0 / F G - 3 6 E x ploded V iew Saito FG-30/FG-36 Exploded View # Description QTY # Description QTY 01 Cylinder (left) 1 42 Piston 1 Rocker Arm Screw and Nut (42-1,42-2) 2ea 06 07 Piston Pin 1 43 Rocker Arm Pin 2 08 Piston Pin Retainar 2 44 Rocker Arm Bracket (Left) 1 45 Rocker Arm Bracket (Right) 1 46 Valve (In and Out) (46-1, 46-2) 2 47 Valve Spring+Keeper+Retainer (47-1,47-2,48) 2ea 48 Valve R
36 P arts L ist P arts list Description FG-14B FG-20 FG-30 FG-36 01 Cylinder, Left G14B01 G2001 G3001 G3601 06 Piston 10006 125A06 18006 220A06 07 Piston Pin 1007 120S07 18007 08 Piston Pin Retainer (6 pc.
38 W arranty I nformation 39 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 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. (a) This warranty is limited to the original Purchaser (“Purchaser”) and is not transferable.
41 40 Law: These Terms are governed by Illinois law (without regard to conflict of law principals). Safety Precautions This is a sophisticated hobby Product and not a toy. It must be operated with caution and common sense and requires some basic mechanical ability. Failure to operate this Product in a safe and responsible manner could result in injury or damage to the Product or other property. This Product is not intended for use by children without direct adult supervision.
✄ • Damage due to improper disassembly • Modifications of any kind • Repair or replacement and any warranty coverage is Horizon’s sole decision 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.
