EY35, EY40 - Small Engine Discount

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6, CARBURETOR SPECIFICATION I <strong>EY35</strong> I E Y40 Model Part No. Main Jet Main Air Jet Pilot Jet 6 -1 OPERATION and CONSTRUCTION #107.5 BV26-20 BV26-19 2246230100 2236230100 #112.5 $1.2 $1.5 #57.5 #55 Throttle Valve #135 #150 Pilot Screw 1 I 1 turn (Return) A PI LOT FUEL NEEDLE VALVE FLOAT FLOAT CHAMBER W Fig. 48 - 26 -
6-1 -1 FLOAT SYSTEM The float chamber is located just below the carburetor body and, with a float and a needle valve, maintains a constant fuel level during engine operation. The fuel flows from the fuel tank into the float chamber through the needle valve. When the fuel rises to a specific level, the float rises; and when its buoyancy and fuel pressure are balanced, the needle valve close to the shut off the fuel, thereby keeping the fuel at the reference level. 6-1 -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 outllet and the by-pass. During engine idling, the fuel is mainly fed from the pilot outlet. 6-1-3 MAIN SYSTEM The main system feeds the fuel to the engine during medium- and high-speed operation. The fuel is metered by the main jet and fed to the main nozzle. The air metered by the main air jet is mixed with the fuel through the bleed holes in the main nozzle, and the mixture is atomized out of the main bore. It is mixed again with the air taken through the air cleaner into an optimum fuel-air mixture, which is supplied to the engine. 6-1 -4 CHOKE The choke is used for easy start in the cold season. When the recoil starter is pulled with a closed choke, the negative pressure applied to the main nozzle increases and draws much fuel accordingly; thus easily start up the engine. ' 6-2 DISASSEMBLY and REASSEMBLY Apart from mechanical failures, most of carburetor troubles are caused by an incorrect mixing ratio, which may arise mainly due to a clogged up ah or fuel passage in jets, or fuel level variations. In order to assure proper flow of air and fuel, the car; buretor must be kept clean at all times. The carburetor disassembly and reassembly procedures are as follows: (See Fig. 49.) 6-2-1 THROTTLE SYSTEM 1) Remove the Phdlips screw (I) and throttle valve (2), and pull out the throttle shaft (3). 2) The spring (5) can be taken out by removing the throttle stop screw (4). *Be careful of the direction of the throttle valve. The circumference of the throttle valve is aslant. Install the valve so the punched mark on the valve can be seen on the left. 6-2-2 CHOKE SYSTEM I) Remove the Phillips screw (6) and choke valve (7), and pull out the choke shaft (8). Stop ring (9) can not be removed. 2) When reassembling the choke shaft, make sure that the cutout in the choke valve faces the main air jet. 6-2-3 PILOT SYSTEM I) Remove the pilot jet (1 0), using correct tool to avoid damage to it. 2) Remove pilot screw (1 1) and spring (1 2). 3) Reassembly *Tighten the pilot jet securely. Otherwise, the fuel may leak, causing engine malfunction. *If the tapered part of the pilot screw is out of shape, replace it with a new one. - 27 -
Page 2 and 3: - ROBIN AMERICA, INC. ROBIN TO WISC
Page 4 and 5: See rion Title Page 6 . CARBURETOR
Page 6 and 7: 2. PERFORMANCE 2-1 MAXIMUM OUTPUT T
Page 8 and 9: 3. FEATURES Small in size, light in
Page 10 and 11: 4-5 CAMSHAFT Models EY3S-B, 3S-BS,
Page 12 and 13: 4-11 COOLING DEVICE The cooling fan
Page 14 and 15: 4-17 SECTIONAL VIEW OF ENGINE / REC
Page 16 and 17: ~ 5. DISASSEMBLY and REASSEMBLY 5-1
Page 18 and 19: I I I I I Order Item Procedures Rem
Page 20 and 21: Order 15 - 16 17 Item Electric devi
Page 22 and 23: 5-4 HOW TO REASSEMBLE 5-4-1 PRECAUT
Page 24 and 25: ~ MATCH 5) Assemble the piston and
Page 26 and 27: .TAPPET CLEARANCE ADJUSTMENT Move t
Page 28 and 29: *SPARK CHECK * Clean the point surf
Page 32 and 33: ~ 1 6-2-4 MAIN SYSTEM 1) Remove the
Page 34 and 35: 9. TROUBLE SHOOTING The following t
Page 36 and 37: ENGINE KNOCKS Low-quality gasoline.
Page 38 and 39: 10-5-2 FLEXIBLE COUPLING When using
Page 40 and 41: 10-7 VINYL-INSULATED WIRE Recent en
Page 42 and 43: 12. TABLES OF CORRECTION STANDARDS
Page 44 and 45: ITEM 1 4- .4- 5 Journal OD. Valve s
Page 46 and 47: - ITEM MODEL rpm TOOL REMARKS ,- Mi
Page 48: 13-5 EVER'.' 502 - 600 HOURS (SEMIA

EY35, EY40 - Small Engine Discount

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