ROBIN AMERICA, INC.
CONTENTS Section Title 1. SPECIFICATIONS .......................................... Page 1 2 . PERFORMANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 - 1 Maximum Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 - 2 Continuous Rated Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 MaximumTorque a t Maximum Output ..................... 2 3. FEATURES . . . . . . . . . . . . . . . . . . . . . . . .
Section . Page Title . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 8 - 1Operation and Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 8 - 2 Disassemblyand Reassembly ............................. 33 9. STARTING MOTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 9 - 1 Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 9 - 2 Inspection andRepair . .
1 SPEC1F ICATIONS Model I EY45V Air-Cooled, 4-Cycle, VerticalShaft, Single Cylinder Gasoline Engine TY Pe 90 mm x 70 mm (3.54" x 2.75") Bore x Stroke ~~ 445 cc (27.15 cu. in) Piston Displacement 12 HP/3600r.p.m. (SAE Code-J607a) Maximum Horse Power 2.5 kg-m/2600 r.p.m. (18.08 ft-lbs./2600 r.p.m.) Maximum Torque Counter-clockwise as viewed from P.T. 0.
2. PERFORMANCE 2-7MAXIMUM OUTPUT The maximum output of an engine is such a standard poweras produced by the engine with its throttlevalve fully opened after its initial break-in period when all the moving parts are properly worn in. Therefore, a new engine may not produce the maximum output in the beginning because the moving parts are not in a properly worn-in condition.
3. FEATURES I . The cylinder and crankcase is a light weight one-piece aluminum diecasting. The dimensions are as small as those of a 10-horsepower engine. 2. The engine is powerful with a wide torque range from low speed tohigh. 3. The vibration-free design with twin balancer shafts. 4. A pointless electronic ignition system is adopted as standard, which makes the ignition system maintenance-free.' You will no longer be troubled by worn contact points or faulty sparking from wrong ignition timing. 5.
4-2 MAIN BEARING COVER The main bearing cover is an aluminum diecasting, which is mounted on the output shaft side of the crankcase. Remove the main bearing cover to expose the inside of the engine inspection. for The main bearing cover also serves as an oil pan, with a trochoid oil pump, oil filler and oil drain plug. (See Figs. 2 and 3.) Fig. 2 Fig, 3 4-3 CRANKSHAFT The crankshaft is forged carbon steel, and the crank pin is induction-hardened.
The camshaft is a hollow special cast iron integrally molded with the camshaft gear. The governor plate is riveted to it, and one end of.the camshaft has a pin for driving the oil pump. (See Fig. 6 .) Fig. 6 4-6 VALVE ARRANGEMENT The intake valveis located at flywheel side of the crankcase. Hardalloy valve seats are moldedinthecylinder block for added durability. (See Fig. 7.) Exhaust intake Valve Fig.
4 - 8 GOVERNOR The governor is a centrifugal flyweight type which permitsconstantoperationatthe selectedspeed against load variations. Governor gear is installed on the bearing cover, and it engages with the cam gear after reassembling. (See Fig. 9.) Fig. 9 4-9 COOLING The cooling fans on the flywheel cool the cylinder and cylinder head by forced air cooling. Cylinder baffles is provided for guiding the cooling air. & 4- 10 LUBRICATION Thetrochoid oil pump is mountedinside of the main bearing cover.
4-12 CARBURETOR is employed.It has been carefullyset after thorough teststo assure satisfactory start up, acceleration, fuel consumption, output performance, etc. (See Fig. 12.) For construction and other details, refer t o page 32 Section "8. CARBURETOR". A horizontaldraftcarburetor Fig. 12 4-13 AIRCLEANER 'leaner Case Cleaner Element The air cleaner is a semicyclone type with double elements. (See Fig. 13.) ~ Fig.
4-15 SECTIONAL VIEW of ENGINE Flywheel /-(Cooling Fan) f Ignition Coil Housing ' Head -8-
r Tappet Air Cleaner Intake and Exhaust Valve Muffler rSp “Spark 1 Oil Filler Starting Motor -9- Plug Cap
5. DISASSEMBLY and REASSEMBLY 5 - 1 PREPARATIONS and SUGGESTIONS 1 ) When disassembling the engine, memorize well the locations of individual parts so that they can be reassembed correctly. I f you are uncertain of identifying some parts, it is suggested that tags be attached to them. 2) Have boxes ready t o keep disassembed parts by group. 3) To prevent missing and misplacing, temporarily assemble each group of disassembed parts. 4) Carefully handle disassembed parts, and clean them with washing oil.
5 - 3 HOW TO DISASSEMBLE *Bolt length is the length from bolt endto the bottom surfaceof bolt head. E Order Procedure item Remarks Engine (Oildrain plug) Remove oil drain plug and discharge oil. Muffler and bracket (1) Remove muffler bracket. (2) Turn up heat deflector tabs, and remove Be careful not to lose gasket. 17 mm box wrench 10 mm box wrench 12 mm box wrench nuts.
+ Order I Governor lever I Procedure item Remarks ~ ~~~ Memorize or mark the governor spring hooking position. (1) Remove governor lever from shaft. (2) Remove governor spring and governor rod from governor lever. I I Tool 10 mm box wrench ’ 10 mm box wrench (1) Remove speed control assembly from crankcase. (2) Remove choke rod from speed control assembly. Control Rod Spring GoV Choke R o d 1 5 \ Lever Choke ltrol Governor Spring I Ylarburetor Governor Lever Fig.
Order I Procedure Item I A i r cleaner L Remarks Tool (1) Remove wing nuts, cleaner cover, and element. (2) Remove cleaner case. 10 mm wrench Carburetor and (1) Remove support (elbow) bolt on crankcase side. intake manifold ( 2 ) Remove intake manifold nuts, and assembly of intake manifold, carburetorand elbow from engine. (3) Separate carburetor and elbow from intake manifold if necessary. Disconnect breather pipe at elbow side end. Oil filler Be careful not to lose O-ring.
1 Order I Item I Procedure I 8 I Startingmotor I Remove starting motor. I 9 Rotating / screen II I lo Blower housing and head cover I Remarks Tool 1 12 mm box wrench Remove rotating screeen and spacer. 12 mm box wrench (1 j Remove blower housing. (2 j Remove cylinder baffle. (3j Remove head cover.
Order Remarks Item Procedure Tool I I 11 Igntion coil Remove ignition coil from crankcase. Be sure to remove ignition coil f i s t . 10 mm box wrench 12 Flywheel and lighting coil (1) Remove nut from tip of crankshaft. (2) Remove flywheel using flywheel puller. (See Fig. 16.) (Ring gear is located inward of ignition coil, so, if flywheel is pulled out first, case may become broken.) 24 mm box wrench (3) Remove charge coil. (See Fig. 17.) Phillips screwdriver Flywheel Puller Fig. 17 Fig.
Order 13 Remarks Item Tool Procedure Cylinder head (1) Remove spark plug. head.cylinder ( 2 ) Remove 14 Breather (1) Remove breather cover. ( 2 ) Remove breather plate. 15 Intake and exhaust valves (1) . . Remove tappet cover. (2) Using a valve spring retainer, remove retainer lock from valve stem. (3) Remove intake and exhaust valves. (See Fig. 18.) (4) Remove spring retainers and valve springs. 16 Main bearing cover (1) Remove bolts.
Head Gasket iap Spark Plug Valve Guide Exhaust Valve (Outer) Q Main Bearing Cove; - 17 -
1 Order - Item I Procedure Remarks Balancers (1) Turn crankshaft to top dead center. ( 2 ) Remove balancers. (See Fig. 20.) Camshaft and tappets (1) Remove camshaft. (See Fig. 2 1 .) (2) Remove tappets. The tappets for intake and exhaust valves are interchangeable, but in case of reusing, reassemble exactly as before. Tool - 12 mm box wrench Blancer 1 Cran Balancer 1 / \ Balancer 2 11 Fig. 20 A d d I " Fig.
Order I Item ~~ ~~~~ I I Procedure Remarks ~ ~ 19 Connecting rod (1) Turn up lock washer tabs and remove bolts. (2) Remove connecting rod large end cap, push piston up out of cylinder. 20 Crankshaft Remove crankshaft by lightly tapping its flywheel end. I Tool 12 mm box wrench Be careful notto damge crankcase oil seal.
5-4 HOW TO REASSEMBLE 5 - 4 - 1 PRECAUTIONS IN REASSEMBLY Everyandeachpartshouldbecleanedthoroughly. Especially, pay utmost care and attention to the cleanliness of the piston, cylinder, crankshaft, connecting rod andbearings. Scrape off carbons completely from the cylinder head and the piston top; especially the carbon adhered in the groove of the piston ring should be careflly and completely taken out. Carefully check the lip portion of every oil seal.
5-4-3ASSEMBLING ORDER and PRECAUTIONS - 1) Place the tappets into the crankcase. NO,TE: The intake and exhaust tappets are the same, but markthem differently when disassembling because o f different valve clearances; and f i t them into their original place. Apply oilto the tappets beforehand. 2) Assemble thecrankshaftandcamshaftatthe I same time. Fig. 22 NOTE: The timing marks are punchedon the crankshaft gear and the camshaftgear. Match these timing marks when assembling. (See Fig. 22.
5 ) Install the piston and connecting rod assembly. When installing theconnectingrodintoplace, hold piston rings with the ring guide as shown in Fig. 26 (if no ring guide is available, keep pressing the piston ring, with finger tips and gently tap the top of the piston with a wooden piece or the like to push it in), and check that the symbol 8 or the mark “MAG” on the connecting rod is in the direction of the flywheel magneto.
8) Sideclearancemeasuring Adjust the side clearances of the crankshaft and camshaft with the adjusting collars. Measure A, B , D, and E shown in Fig. 27, and select adjusting collars so that the side clearances of both the crankshaft and camshaft will be 0 t o 0.25 mm. NOTE: C indicates gasket thickness. Calculate it as 0.25 mrn. NOTE: Three kinds of adjusting collars- 1.05 mm, 1.2 rnrn, and 1.35 mrn thick-are available for both the crankshaft and camshaft.
9) Balancermounting Move the piston to the top dead center. Engage balancer 1 with the crankshaft, and balancer 2 with balancer 1. (See Fig. 28.) Match the match marks as shown in Fig. 28. /- As viewed from drive shaft side. Balancer Gear Match Marks Balancer 1 Fig. 28 10) Main bearing cover mounting .Fit the governor sleeve on the camshaft; install the adjusting collars selected in Step8), and install the main bearing cover assembly that was readied in Step 7). .
*Intake and exhaustvalve specifications are as follows: Guide VALVE and VALVE GUIDE CLEARANCE ~~ ~~ A-VALVE FACE ANGLE 45O B-SEAT ANGLE 45O C-GUIDE INSIDE DIA. 8dia. +0.036 mrn INTAKE -0 030 8 dia. -o:055 mm E XH UAST -0.070 8 dia. -o.090 mrn D-VALVE STEM OUTSIDE DIA MAXIMUM ALLOWABLE CLEARANCE BETWEEN Cand D INTAKE 0.030 L 0.070 L EXHAUST - 0.091 L 0.126 L L: Loose Table 2 .TAPPET CLEARANCE ADJUSTMENT Turn the crankshaft to compression TDC, and check the tappet clearance as follows.
"Intake and exhaust valve installation Apply oil to the valve stems, and install the valves securely byusing the valve spring retainer and pliers. (See Fig. 3 1 .) After their installation, check the tappetclearance again. Intake/Exhaust Valve Fig. 31 12) Install the gasket and tappet cover. 13) Install breather plate and breather plate with gaskets. NOTE: Make sure to use the correctgaskets. 14)Cylinderhead Replace the head gasket with a new one.
17) Blower housing and head cover Install head cover, blower housing and cylinder baffle. 18) Rotatingscreen Mount the rotating screeen with spacer. 8 x 50 mm bolts with washer and spring washer Tightening torque: 160 200 kg-cm - 19) Oilfiller Insert the oil filler into the main bearing cover, exercising care not to damage the O-ring at the bottom of the oil filler. Fasten the top of the oil filler with the oil filler clamp. 20) Intake manifold, carburetor, elbow, and air-cleaner .
a) Intakemanifold b) Insulator Be mounting careful itsof direction. Intake Manifold Carburetor SideSide Intake manifold side Carburetor side c) Carburetor *Pay attention to the types of gaskets on the front and back. .Install the governor rod, rod spring, and choke rod. d) Elbow and support (elbow) Install the breather pipe between the crankcase and elbow. Fig.
6. ENGINE S 6-1 CHOKE and SPEED ADJUSTMENT Operate the engine at no-load. Then, turn speed control lever toward “CHOKE” position until it just contacts the choke/R.P.M. adjusting screw on choke lever (do not move choke lever.). To adjust the “CHOKE” start position and HIGH speed operating R . P . M . , use a tachometer or revolution counter. Turn the adjusting screw in or out against the speed controllever until the desired no load operating speed is obtained.
7 . MAGNETO The pointless electronic ignition magneto consists of a flywheel andan ignition coil. 7 - 1 FEATURES This system is outer coil type without pulser and is called T.I.C. (Transistor igntion circuit type). To the EY45V engine this T. I . C. is equipped as standard parts.
7 - 4 CHECKINGPROCEDURES - MEASURING RESISTANCES 7 - 4 - 1 IGNITION COIL 1) Primary Side n Note: The following resistance values are measured a t 20°C. Tester Between stop lead and core i"GZZd 2) Secondary Side Between high tension cord and core 7 - 4 - 2 LAMP COIL and CHARGECOIL 1) Charge Coil Tester Between GreedWhite cord and GreedWhite cord 10.9 - 1.
8. CARBURETOR 8 - 1 OPERATION and CONSTRUCTION (See Fig. 37 and 38.) 8 - 1 - 1 FLOAT SYSTEM The float chamber is located just below the carburetor body and, with a float and a needle valve, maintains a constant fuellevel during engine operation. The fuel flows from the fuel tank into the float chamber through needlevalve.
D b 8-1 - 2 PI LOT SYSTEM The pilot system feeds the fuel to the engine during idling and low-speed operation. The fuel is fed through the main jet to the pilot jet,where it is metered, and mixed with the air metered by the pilot air jet. The fuel-air mixture is fed to the engine through the pilot outlet and the by-pass. At idling speed, the fuelis mainly fed from the pilot outlet. 8 - 1 - 3 MAIN SYSTEM The main system feeds the fuel to the engine at medium- and high-speed operation.
8-2-4 MAINSYSTEM 1 ) Remove the bolt (21) and take out float chamber body (23). 2) Fromthebody (1) removethemainnozzle ( 1 8), andthenremovethe main jet (20) fromthemain nozzle (1 8). 3) Reassembly a) Fasten the main jet securely to the body. Otherwise, the fuel may become too rich and cause engine malfunction. b) The bolt tightening torque is 70 kg-cm. /"- 8 - 2 - 5 FLOAT SYSTEM 1) Pull out the floatpin ( 1 6) and remove the float ( 1 7) and needle valve (24).
9. STARTING MOTOR 9- 1 DISASSEMBLY 1) Remove 5 mm terminal nuts. (2 pcs.) Fig. 40 2) Remove 5 mm through bolts. (2 pcs.) y' 3) Remove terminal bush. 3 Fig. 41 4) Remove rear cover. 4 Fig.
Remove 4 mm Screws. (2 pcs.) Remove Brush Holder. The brush holderis disassembed by removingthe 4 mm screws. (2 pcs.) Remove the TerminalBush No. 2. I Fig. 43 8) YokeAssembly Remove yoke assembly. Fig. 44 9) The pinion stopper clip is removed with a stanis dardscrewdriver while thepinionstopper pushed toward the pinion. A \ " " \I 1 Fig.
10) Disassemblepinion stopper 10, pinion return spring 1 1 and pinion assembly 12. 12 10 Fig. 46 11) Disassemble armature 13, thrust washer 14 and front cover 1 5. Fig. 47 1) The 5 mm Terminal Nuts (2 pcs.) 2) "M" Terminal Bush No. 1 3) The 5 mm Through Bolts (2pcs.) 4) The RearCover 5) The 4 mm Screws ( 2 pcs.) 6) The Brush Holder 7) "M" Terminal Bush N o .
9 - 2 INSPECTION and REPAIR 9 - 2 - 1 ARMATURE 1) Check the diameter of the commutator. I f theoutsidediameter of thecommutator is smallerthanthelimit,thenreplacearmature with a new one. Standard (New) 30 m m Limit (Used) 29 m m Fig. 49 2) Continuity Test for the Armature Coil Use a tester to check for continuity between parallel points on the commutator.If there is continuity, the armatureis good. Tester N o continuity: (broken coil) Replace the armature unit. Fig.
4) Check for Surface Distortion on the Armature and the Commutator Use a dial gauge to measure the distortion of the outsidesurfaces of thearmaturecoreandthe commutator. If it is above the limit, then repair or replace it. Core (mm) I Fig. 52 5 ) Check the Surface of the Commutator Ifthecommutatorsurface is rough, polish it with fine sandpaper(# 500 600). - Fig.
Measure the length of the brushes and if they are shorter than the limit, replace them. Limit (Used) Standard (New) I I 12.5 mm 9 mm 1 Brush I Fig, 55 9-2-3BRUSH HOLDER 1) Insulation Test for the Brush Holder Check for continuity between the brush holder's top (positive side) and its base (negative side). If there is n o continuity, then it is good. Continuity Exists: (Insulation failure) Replace brush holder. Fig.
9-2-4PINION CLUTCH Inspection of the Pinion Clutch Rotate the pinion manually. While rotating it in the direction of normal operation, smoothly reverse the direction of rotation to confirm thatit locks. In the event of any irregularity, replaceit. Fig. 58 9-3 REASSEMBLY Reassembly is in the reverse order of disassembly, however, please note the following points. The Places to Apply Grease: The sliding surfaces of the pinionand the shaft’s spline. The metals holding the shaft at the frontand rear covers.
IO. BREAK-INOPERATION of REASSEMBLEDENGINE * An overhauled engine must be operated at low speedto break-in the parts. A thorough break-in is indispensable particularly when the cylinder, piston, pistonrings or valves are replaced with new ones. The recommended break-in schedule is shown below. LOAD SPEED TIME LOAD 2,500 rpm 10 minutes NO LOAD 3,000 rpm 10 minutes NO LOAD 3,600 rpm 10 minutes 4.5HP 3,600 rpm 30 minutes 9.
B The following three conditions must be satisfied for satisfactory engine start. 1.Thecylinderfilledwith a properfuel-airmixture. 2. An appropriate compression in the cylinder. 3. Good sparks at the correct time to ignite the mixture. The engine cannot be started unless these three conditions are met. There are also other factors which make engine start difficult, e.g., a heavy load on the engine when it is about to start at low speed, and a high back pressure due to a long exhaust pipe, justto say a few.
1 1 - 1 - 3 ELECTRICAL SYSTEM Check the followings for lack of sparks. 1) Leads of the ignition coil, spark plug or contact breaker disconnected. 2) Ignition coil damaged and shorted. 3) Spark plug cable wet or soaked with oil. 4) Spark plug dirty or wet. 5) Spark plug electrode gap incorrect. 6) Spark plug electrodes are connected or bridged. 7) Incorrect spark timing. 11- 2 ENGINGE MI FIRES. 1) 2) 3) 4) 5) 6) Incorrect spark plug electrodge gap. Adjust it to anywhere between0.6 and 0.7 mm.
11-5 ENGINEKNOCKS. - 1)Low-qualitygasoline. 2) Engineoperatingunder heavy load at low speed, 3) Carbon or lead deposits in the cylinder head. 4) Spark timing incorrect. 5) Loose connecting rod bearing due to wear. 6) Loose piston pin due to wear. 7) Cuases of engine overheat. 11 - 6 ENGINE BACKFIRES through CARBURETOR. 1) Water or dirt in gasoline,o r low-grade gasoline. 2 ) Intake valve stuck. 3) Valves overheated, or red-hot carbon particles in the combustion chamber. 4) Enginecold.
12. INSTALLATION Engine life, ease of maintenance and inspection, frequency of checks and repairs, and operating cost all dependonthe way in whichtheengine is installed.Carefullyobserve thefollowinginstructionsforinstalling the engine. , " - 12-1 INSTALLING When mounting the engine, carefully examine its position, the method of connecting it t o a load (machine), the foundation, and the mehtod of supporting the engine.
13. CHECKS and CORRECTIONS After disassembling and cleaning the engine, check and repair, if necessary, according to the correction table. The correction table apolies whenever the engines are repaired. It is important for the servicemen to be familier with the contents of this table. Correct maintenance is recommended by observing the correction standards specified. The meanings of the terms used in the correction table are as follows: 1) Correction Repair, adjustment or replacement of any engine parts.
14. TABLE of CORRECTION STANDARDS lTEM STANDARD SIZE 1 T USE CORRECT1 LIMIT TOLERANCE Flatness of cylinder head 0.05 + ZORRECTIOfl METHOD Correct Surface Bore 90 dia. Dif. between max. & min. 0.1 5 0.65 +0.006 -0.016 Roundness 0.01 Cylindricity 0.015 Valve seat contact width plate, Boring I Correct 2.5 1 .2 -1. .5 Valve guide I.D. +0.036 0 8 dia. 0.1 5 0.1 5 O.D. at skirt, in thrust direction (incl. over size) B 0.25 C 0.5 Width of ring groove gauge Replace 1 I STD 89.
1 ITEM STYFtRD 1 20 dia. Piston pin O.D. ' USE TOLERANCE LIMIT LIMIT CoRRECTlyN 0 1 - -0.009 +0.016 3 8 dia. Clearance between rod large end I.D. and crankpin Small end I.D. 20 dia. Clearance between small end I.D. 0.082 +0.023 - +0.010 0.1 - 0.032 - 0.3 0.06 Distance between and large end small end bores 120 Crankpin O.D. -0.03 0.1 3 8 dia. -0.050 TOOL I CORRECTION METHOD -0.03 0.1 I 1 I I Cylinder gauge Replace Cylinder gauge, Micrometer Replace 0.08 0.
CORRECTION TOLERANCE LIMIT STANDARD ITEM SIZE LIMIT I 46 Clearance between stem and guide Vernier calipers Replace Square feeler WJge Replace Micrometer Replace Feeler gauge Correct -0.5 Vernier calipers Replace - 0.5 Vernier calipers Replace ,.o 1 Intake Exhaust ,- For total length -0.030 8 dia. Exhaust 8 dia. CORRECTION METHOD -1.5 Squareness Intake 1 REMARKS I Free length Valve stem O.D. I - 0.055 1 -0.070 1 -0.096 0.030-0.091 0.070 - 0.126 -0.15 0.3 0.
r REMARKS HPlrpm USE LIMIT 12.013600 Below 1 10% of rated output Max. Output Continuous Rated output 9.0/3600 I ITEM Fuel Consumption REMARKS CORRECTION PRECISENESS liter/hr of standard consumption 4.0 At continuous ratad output Above 135% ITEM Lubricant Consumption I ITEM Fixed quantity of Lubricant cc/hr USE L I M I T cdhr REMARKS 40 Single grade oil 1 0 - 15 liter 1 REMARKS 1.3 *Use the SC or higher grade engine oil.
FREQUENCY OF OIL CHANGE ITEM First time: Change oil after20 hours operation. Second Time and Thereafter: Change oil every 50 hours operation. Oil Change CORRECTION LIMIT Cylinder pressure 7.0 - 7.5/800 70% of normal value REMARKS TOOL Min. accelerating revolution r Pressure gauge and down ITEM 2000 r Crankshaft Tachometer kg-cm ft-lb TOOL Cylinder head clamp nuts 340- 390 24.6-28.3 Torque wrench Connecting rod bo1ts 250 18-21.7 Torque wrench 800-1000 57.9-72.
15. MAINTENANCE and STORING The following maintenance jobs apply when the engine is operated correctly under normal conditions. The indicated maintenance intervals are by no means guarantees for maintenance free operations during these intervals. For example, if the engine is operated in extremely dusty conditions, theair cleaner should be cleaned every day instead of every50 hours.
15-4 EVERY 100 - 200 HOURS (MONTHLY) CHECKS and MAINTENANCE Checks and maintenance Reasons for requiring them Clean fuel filter and fuel tank. The engine will be out of order. I Clean contact breaker points. Remove grass, chaff or dirt clogged the air cooling system. Remove the blower housing and clean it. 15-5 EVERY 500 - I engine The output drops. The engine overheats.
Industrial Engines