Robin America SP170 Service Manual

SERVICEMANUALEX13,17,21,27SP170,SP210EX21 Electronic Fuel InjectionENGINESModelsPUB-ES1934Rev. 08/09

- 7 -3. FEATURES3-1 EXTREMELY SILENT - SOFT TONE QUALITYEX engines are 2dBA quieter and softer in tone than other engines in the same class.This quiet

(4)With the throttle body installed on the engine: Carefully remove fuel pump pulse line from throttle body pulse pump fittingDo not damage throttle

- 14 -6. INSTALLATION6-1 FUEL SYSTEMIf the fuel tank is detached from the engine, the height from the bottom of the fuel tank to the fuel joint of the

- 15 -7. TROUBLESHOOTINGIf the engine shows any sign of malfunction, the cause should be determined immediately and appropriate countermeasures should

- 16 -Problem and possible cause RemedyPoor output1. Insufficient compression 1) Loosen spark plug Retighten; replace gasket2) Leakage from cylinder h

- 17 -Problem and possible cause RemedyExcessive engine oil consumption1. Oil leakage 1) Loose oil drain plug Tighten2) Faulty oil drain gasket Replac

-18-Check enginespark ENGINE WILL NOT STARTSpark plug improperlygapped, dirty or fouledor defective Wiring damaged Clean, regap or replaceas necessary

- 19 -8. MAINTENANCE AND STORAGEThe maintenance jobs described below apply to correct use of the engine under normal conditions.The maintenance interv

- 20 -8-5 INSPECTION AND MAINTENANCE EVERY 300 HOURS MAINTENACE ITEMS REASON / REMARKS(1) Inspect the intake and exhaust valve clearance. Adjust if

- 21 -9. ORGANIZEMost people know that engines will require daily and periodic maintenance, but it’s also important to be aware of the audible and vis

- 22 -9-2 ADJUSTING FOR THE ENVIRONMENTIn addition to a regular maintenance routine, some application circumstances require special care, such as high

- 8 -4-1 CYLINDER AND CRANKCASEThe cylinder and crankcase are aluminum die-castingas a single piece. A special cast iron cylinder liner ismolded into

- 23 -9-3 SUITING UP FOR STORAGEWhether it’s the off-season or other circumstances prevent operating your engine-powered equipment for more than 30 da

- 23 -

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- 9 -4-5 PISTON RINGSThe piston rings are made of special cast iron. The profile of the top ring is a barrel face or tapered face, andthat of the seco

- 10 -4-13 IGNITION SYSTEMThe ignition system is a transistor controlled magnetosystem with the ignition timing set at 23 degrees (EX13/17/21)[27 deg

- 11 -4-14 CARBURETORThe engine is equipped with a horizontal draftcarburetor. The carburetor setting is calibrated aftercareful testing for optimum a

- 12 -Fig. 4-16TANK CAPFUEL TANKBLOWER HOUSINGSTARTING PULLEYRECOIL STARTERFLYWHEEL CHARGE COIL(OPTION)OIL SENSOR(OPTION)MAIN BEARING COVERCONNECTING

- 13 -Fig. 4-17FUEL TANKOIL GAUGEOIL DRAIN PLUGTIMING CHAINFILLER PLUGPISTON PINPISTON RINGCONNECTING RODSTARTINGMOTOR(OPTION)MAGNETICSWITCHMUFFLERPIS

- 14 -Fig. 5-15. DISASSEMBLY AND REASSEMBLY5-1 PREPARATIONS AND PRECAUTIONS(1) When disassembling the engine, memorize the location of each part so th

- 15 -Step Parts to remove Remarks and procedures Fasteners1 Drain the engine oill (1) Remove a drain plug (M14×12mm)located on both sides of the case

- 16 -Fig. 5-3Step Parts to remove Remarks and procedures Fasteners2Air cleaner cover Remove the air cleaner cover.3Air cleaner Remove the element, an

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- 17 -Fig. 5-4STEP 4STEP 5STEP 6STEP 6M6 x 8 BOLT : 4 pcs.M6 x 12 BOLT : 4 pcs.STOP SWITCHBAFFLE 2 (HEAD)BAFFLE 3(EX21 ONLY)M4 TAPPING SCREW : 2 pcs.R

- 18 -AASTEP 7STEP 8FUEL TANKM6 x 25 BOLT : 1 pc.(EX13, 17, 21)M8 x 25 BOLT : 2 pcs.(EX27) M6 NUT : 2 pcs.(EX13,17,21)M8 NUT : 2 pcs.(EX27)M8 NUT : 2

- 19 -Fig.5-7Step Parts to removeRemarks and proceduresFasteners9Governor system (1) Loosen the bolt and remove the governorlever from the governor sh

- 20 -STEP 12STEP 13STEP 14GROMMET(EX13,17,21 only)STARTING PULLEYFLYWHEELM14 NUT : 1 pc. (EX13,17,21)M18 NUT : 1 pc. (EX27)M6 x 25 BOLT and WASHER :

- 21 -ELECTRIC STARTER (option)STEP 15UPPER SIDE M6 x 30 FLANGE BOLT : 1 pc.DOWN SIDE M6 x 20 FLANGE BOLT : 1 pc. EX17, 21EX27 M8 x 28 BOLT : 2 p

- 22 -Fig.5-12Step Parts to remove Remarks and procedures Fasteners16Baffle 1 (case) Remove the baffle 1 (case) M6 × 12mm : 1 pc.(Models EX13, 17 and

- 23 -Fig. 5-14aStep Parts to remove Remarks and procedures Fasteners19Rocker cover (1) Remove the rocker cover from thecylinder head.(2) Remove the g

- 24 -Fig. 5-16Step Parts to remove Remarks and procedures Fasteners21Main bearing cover (1) Remove the flange bolts of main bearingcover from the cra

- 25 -TENSIONERSPRING(TENSIONER)CHAINPIN (TENSIONER)PIN (CAMSHAFT)CAMSHAFTCHAINSTEP 22STEP 22M6 x 12 BOLT : 1 pc.Bolt used to prevent the pin (camshaf

- 26 -Fig.5-20Fig.5-21Step Parts to remove Remarks and procedures Fasteners23Cylinder head,Chain guide(1) Remove the cylinder head from thecrankcase.(

CONTENTSSection Title Page1. SPECIFICATIONS ... 12.

- 27 -Step Parts to remove Remarks and procedures Fasteners25Connecting rod andpiston(1) Scrape off any carbon from the cylinderand the piston head, t

- 28 -Step Parts to remove Remarks and procedures Fasteners27Crankshaft (1) Remove the woodruff key (for the flywheelmagneto).(2) Remove the crankshaf

- 29 -OIL SENSORSHIELD PLATE(OS)M6 x 12 BOLT : 1pc. M6 x 16BOLT : 2pcs. CLAMP(1) OIL SENSOR(a) Mount the oil sensor and fix the wire with the clamp.(

- 30 -(3) PISTON AND PISTON RINGSInstall each piston ring in the correct groove ofthe piston by widening it enough to slide it overthe piston.NOTE: Be

- 31 -(4) PISTON AND CONNECTING RODThe piston is attached to the connecting rod bythe piston pin.When assembling the piston and connecting rod,make su

- 32 -(b) Rotate the crankshaft down to the bottom dead centerand lightly tap the piston head until the large end ofthe connecting rod touches the cra

- 33 -(7) CHAIN GUIDEMount the chain guide to the crankcase.Fig. 5-39bModel EX21mounting positionModels EX13, 17 and 27 mounting positionsCHAIN GUIDEF

- 34 -TIMING MARKThe position of top dead centerMARK PLATEMARK PLATEMARK PLATEMARK PLATEMARK PLATEMARK PLATETIMING MARKROLL PINROLL PINROLL PINTIMING

- 35 -TENSIONERSPRING(TENSIONER)CHAINPIN(TENSIONER)PIN(CAMSHAFT)CAMSHAFTCHAINM6 x 12 BOLT : 1 pc.Bolt used to prevent the pin (camshaft) from coming o

- 36 -(13) MAIN BEARING COVERApply oil to the bearing and the oil seal lip when mounting the main bearing cover. Also apply sealant(Three Bond ì1215î)

- 1 -1. SPECIFICATIONS＊ Specifications are subject to change without notice.Model EX13D EX17D EX21D EX27DTypeAir-Cooled, 4-Cycle, Slant Single-Cylinde

- 37 -(15) VALVE CLEARANCE ADJUSTMENTTemporarily fit the flywheel.Rotate the crankshaft up to the compression topdead center and insert the thickness

- 38 -(16) ROCKER COVERReplace the gasket with a new one, and mountthe rocker cover.M6 ✕ 12mm flange bolt : 4 pcs.SPARK PLUGROCKER COVERM6 x 12 BOLT :

- 39 -Fig. 5-51Air gapFig. 5-52Fig. 5-53FLYWHEELSTARTING PULLEYIGNITION COILTHICKNESSGAUGETo STOP SWITCH(19) FLYWHEEL AND STARTING PULLEYNOTE: When mo

- 40 -Fig. 5-54M6 x 12 BOLT : 2 pcs.M6 x 12 BOLT : 1 pce.SPEED CONTROL LEVERand BRACKETCARBURATORBAFFLE 2 (HEAD)BAFFLE 3(EX21 ONLY)M5 TAPPING BOLT : 2

- 41 -(23) GOVERNOR LEVER(a) Pass the governor rod through the rod spring, then connect to the throttle lever of the carburetor.(b) Attach the governo

- 42 - Governor system adjustment methodThe governor unit is a centrifugal flyweight type and is installed on the governor gear.Since it automaticall

- 43 -(25) MUFFLER(1) Mount the muffler and the gasket on the cylinder head.(2) Mount the muffler cover on the muffler.M6 ✕ 8 mm flange bolt : 1 pc

- 44 -Fig. 5-60(27) BLOWER HOUSING AND RECOIL STARTER(1) Mount the ignition coil cord on the crankcase by aligning it with the baffle 1 (case).(2) Mou

- 45 -Dual elementSTDTypeFig. 5-62(29) AIR CLEANERMount the air cleaner element and cleaner cover.(28) STOP SWITCH(1) Mount the stop switch on the blo

- 46 -(32) BREAK-IN OPERATIONA new engine or an engine that has been completely overhauled by being fitted with a new piston, rings,valves and connect

- 2 -2. PERFORMANCE2-1 MAXIMUM OUTPUTThe Maximum output is the output of an engine with its throttle valve fully opened and considering that all themo

- 47 -6. ENGINE OILUsing engine oil of the correct grade and viscosity greatly lengthens engine life and improves performance.Too much or too little o

- 48 -7. MAGNETO7-1 MAGNETOThe Robin Engine uses a T.I.C. type breakerless magneto ignition system.(1) T.I.C. (TRANSISTOR IGNITER CIRCUIT) has the ign

- 49 -7-3 IGNITION SYSTEM (EX13 ,17, 21)7-3-1 TYPE OF IGNITION SYSTEMEX13, 17 and EX21 have the T.I.C. (Transister, Igniter, Circuit) pointless igniti

- 50 -7-4-3 BASIC THEORY(a) Revolution of the flywheel generates electricity on the primary side of the ignition coil (①), and the basecurrent I1 flow

- 51 -Stop switchFlywheelIgnition coil(with built-in transistor)BlackSpark plug8. WIRING DIAGRAM8-1 MODEL WITHOUT ELECTRIC STARTER (Models EX13, 17, 2

- 52 -8-3 MODEL WITH ELECTRIC STARTER (Model EX27)Fig. 8-3+M-MSTBLA108LA408BlackRedCharge coilDiode rectifierIgnition coilSpark plugKey switchBattery(

- 53 -9. ELECTRIC STARTER9-1 SPECIFICATIONSModels EX17, 21 Model EX27Voltage (V) 12Power (kW) 0.6 0.6Weight (kg) 1.6 3.49-2 OPERATING PRINCIPLESThe ba

- 54 -PINION STOPPER SETPINION AYFRONT METALCASE METALFRONT COVERARMATURE AYYOKE AYTHROUGH BOLT (2 pcs.)BRUSH HOLDERBRUSHSPRING (BRUSH)REAR COVERMAGNE

- 55 -10. OIL SENSOR10-1 SPECIFICATIONS10-2 CONSTRUCTION AND OPERATIONThe oil sensor is composed of the float, permanentmagnet incorporated into the f

- 56 -AAROCKER ARM (EXHAUST)ROCKER ARM (EXHAUST)ROCKER ARM (INTAKE)CAMCRESCENT CAMRELEASE LEVERRELEASE LEVERROCKER ARM (EXHAUST)ROCKER ARM (INTAKE)CAM

- 3 -2000 2400 2800 3200 3600 4000000.51.01.01.52.02.02.53.03.03.54.07.08.09.04.05.0kW[HP]r.p.m.REVOLUTIONMAXIMUM TORQUETORQUEMAXIMUM HORSEPOWEROUTPUT

- 57 -12. CARBURETOR12-1 SPECIFICATIONS12-2 FUNCTIONS AND CONSTRUCTION12-2-1 FLOAT SYSTEMThe float chamber is located below the carburetor body. Throu

- 58 -PILOT OUTLETBYPASSPILOT AIR JETCHOKE VALVEAIR INTAKE PORTMAIN AIR JETMAIN NOZZLEFLOAT CHAMBERPILOT JETFLOATMAIN JETFUELNEEDLE VALVEFLOATFig. 12-

- 59 -Fig. 12-3MODEL EX13, 17, 21 MODEL EX2712223351198410121321424281816172526216719202713 142118 2025263598422231111224106712-3 DISASSEMBLY AND REAS

- 60 -The procedures for overhauling the carburetor are described below. (Refer to Fig. 11-3.)12-3-1 THROTTLE SYSTEM(1) When the throttle stop screw

- 61 -13-1-1 DISASSEMBLY PROCEDURE(1) Release the reel spring power-1 Hold the starter knob and pull out the starterrope.-2 Pull out the rope fully an

- 62 -GREASESHAFT HOOKPosition where the inner end of the spring touches to the rib of the bearing.13-1-2 REASSEMBLY PROCEDURE(1) Put the reel back in

- 63 -(2) Mount the components-1 Mount the ratchet into the reel. (Fig. 13-5)-2 Mount the ratchet guide assembly, taking carenot to move the ratchet.

- 64 -(5) Install the ropeNOTE: This procedure requires 2 people.-1 Pass the rope end through the rope guide and therope hole of the reel and pull thr

- 65 -13-1-3 CHECKING THE RECOIL STARTER AFTER REASSEMBLY(1) Pull the starter knob about 2-3 times.(a) If the starter knob is too heavy to pull, check

- 66 -14. INSTALLATIONInstallation has a decisive influence on engine life, ease of maintenance and inspection, frequency of inspectionand repair, run

- 4 -2000 2400 2800 3200 3600 4000000.51.01.01.52.02.02.53.03.03.54.04.512.011.010.09.04.05.06.0kW[HP]MAXIMUM TORQUEMAXIMUM HORSEPOWERr.p.m.REVOLUTION

- 67 -14-5 POWER TRANSMISSION TO DRIVE MACHINES14-5-1 BELT DRIVENote the following:• Use a V-belt rather than a flat belt.• The drive shaft of the eng

- 68 -Problem and possible cause Remedy1. Ignition system problems1) Spark plug ・ Improper spark plug gap ・ Insulation defect ・ Carbon depositsAdjust

- 69 -Problem and possible cause Remedy1. Insufficient compression 1) Loosen spark plug Retighten; replace gasket2) Leakage from cylinder head gasket

- 70 -Problem and possible cause Remedy1. Oil leakage1) Loose oil drain plug Tighten2) Faulty oil drain gasket Replace3) Loose main bearing cover bolt

- 71 -OKDoes the crank run?Does the starter run?ELECTRIC STARTERCheck battery charged state and battery terminal connection or corrosion for any abnor

- 72 -(1) Starter does not run or only “click” sound is heard.Problem and check item Description Remedy1. Checking ofcontinuity ofwiringCheck S termi

- 73 -(2) Starter runs but engine notProblem and check item Description RemedyCheck engagedstate of pinion andring gear.Motor idles and engine does n

- 74 -16. STANDARD REPAIR TABLES“STD” in the following table is the parts dimension from the brand new engine or the spare parts.Whereas, “Limit” show

- 75 -ITEM STD LimitCYLINDER* Inner diameter* Roundness after reboring* Cylindricity after reboringStandardEX1358.000 - 58.019(2.2835 - 2.2842)To be r

- 76 -ITEM STD LimitPISTON* Ring groove side clearanceTopSecondEX13EX17EX21EX270.035 - 0.080(0.0014 - 0.0031)0.15(0.0059)Oil ringCoil expEX130.02 - 0.

- 5 -2000 2400 2800 3200 3600 400000.51.01.52.02.53.03.54.05.001.02.03.04.07.06.05.05.54.512.013.014.015.0kW[PS]MAXIMUM TORQUEMAXIMUM HORSEPOWERr.p.m.

- 77 -ITEM STD LimitCONNECTING ROD* Large end inner diameterEX13EX17EX2130.000 - 30.016(1.1811 - 1.1817)30.1(1.1850)EX2734.500 - 34.516(1.3386 - 1.339

- 78 -ITEM STD LimitCAMSHAFT* Cam peak height (intake and exhaust)Cam peakheightEX13EX17EX21EX2729.028 - 29.128(1.1428 - 1.1468)28.98(1.1409)Cam inner

- 79 -ITEM STD LimitVALVE SPRING FREE LENGTHEX13EX17EX21EX2727.4(1.0787)VALVE SEAT ANGLE(INTAKE AND EXHAUST)* Valve cutter angle (a)* Valve contact wi

- 80 -16-2 TIGHTENING TORQUEITEMTightening TorqueN・mkgf・cm ft・lb.Cylinder head boltsM8×68flangeboltRe-use 25.0 - 27.0 250 -270 18.1 - 19.5When replace

- 81 -17. MAINTENANCE AND STORAGEThe maintenance jobs described below apply to correct use of the engine under normal conditions.The maintenance inter

- 82 -17-5 INSPECTION AND MAINTENANCE EVERY 300 HOURS17-6 INSPECTION AND MAINTENANCE EVERY 500 TO 600 HOURS (EVERY 6 MONTHS)17-7 MAINTENANCE EVE

ISSUE EMD-ES67172009.05SERVICE INFORMATION

CONTENTSSection Title Page1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

- 6 -2000 2400 2800 3200 3600 400000.51.01.52.02.53.03.54.05.001.02.03.04.09.08.07.06.05.06.56.05.54.515.016.017.018.019.07.0kW[HP]MAXIMUM TORQUEMAXIM

- 1 -1. SPECIFICATIONSModel EX21DTypeAir-Cooled, 4-Cycle, Slant Single-Cylinder, Horizontal P.T.O. Shaft, OHC Gasoline EngineBore & Stroke mm (i

- 2 -2. DESCRIPTION OF FUEL SYSTEMThis engine is equipped with electronic fuel injection. The fuel system consists of a throttle body assembly, power

- 3 -3. DISASSEMBLY AND REASSEMBLY3-1 PREPARATIONS AND PRECAUTIONS(1) When disassembling the engine, memorize the location of each part so that you

- 4 -3-3 DISASSEMBLY PROCEDURES (DIFFERENCE)Step Parts to remove Renarks and procedures Parts Fasteners7Fuel tank (1) Drain fuel from the tank.(2) R

- 5 -Step Parts to remove Renarks and procedures Parts Fasteners10Throttle body, Insulator(1) Disconnect the fuel pump pulse line from the throttle b

- 6 -Step Parts to remove Renarks and procedures Parts Fasteners17EFI power generation module Remove the EFI power generation modudle. M6 × 20mm : 2 p

- 7 -3-4 REASSEMBLY PROCEDURES (DIFFERENCE)(22) THROTTLE BODY(a) Replace the gasket of insulator with a new one and mount the insulator on the cylin

- 8 -4. WIRING DIAGRAMMODEL WITH EFIStop switchPower coilIgnition coilBlackThrottle bodyBlackBlackRedOrangeYellowOil sensorTemperrature sensorThrottle

- 9 -5. THROTTLE BODY5-1 SPECIFICATIONSThis engine is equipped with electronic fuel injection.The fuel system consists of a throttle body assembly, po

- 10 -5-2-4 POWER GENERATION MODULEThe power generation module is installed under the flywheel. This module provides power to the ECU.5-2-5 WIRE HARN