EY35, EY40 - Small Engine Discount

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4-5 CAMSHAFT Models EY3S-B, 3S-BS, EY40-B and 40-BS have intake and exhaust cams of forged carbon steel, which are fitted with a cam gear under pressure. The assembly serves as output shaft that is driven at one half the speed of the crankshaft. The cam gear has a governor fitted to it. Model EY35-D, 35-DS, EY40-D and 40-DS have a camshaft of special cast iron, which is integrally assembled with a cam gear. The two ends of the shaft serve as plain bearings so no ball bearings are used. (See Fig. 6.) Fig. 6 0 4-6 CYLINDER HEAD The cylinder head is an aluminum die casting, and forms a Ricardo type combustion chamber with ample area for high combustion effeciency. The spark plug is tilted for easy mounting of the fuel tank. (See Fig. 7.) Fig. 7 4-7 VALVE ARRANGEMENT The exhaust valve is located upstream of the cooling air with the result that the exhaust valve is intensively cooled for improved engine durability. The inner side of the valve head is reinforced with hard alloy fused to it for added durability. (See Fig. 8.) . " . ". .._ _. Fig. 8 -6-
4-8 GOVERNOR The governor is a centrifugal flyweight type which permits constant operation at the selected speed against load variations. (See Fig. 9.) 4-9 BALANCER Fig. 9 The balancer is assembled with the main bearing cover. Unbalanced moments of inertia generated in vertical and horizontal directions by the crankshaft, piston and connecting rod are balanced by the balancer whxh rotates at the same rate as the crankshaft in opposite direction thereto, thus reducing vibration due to unbalanced moments of inertia. (See Fig. 10.) 4-10 DECOMPRESSION DEVICE Fig. 10 The intake cam has a special profile and the intake valve is sligh .tly raised during the compression stroke to let a slight amou of compressed air out to make starting easy. (See Fig. 11 .) EXHAUST TAPPET IN TAPPET IN TAPPET '.O. SHAFT SIDE EXHAUST-CAM IN CAM DECOMP LIFT Fig. I 1 -7-
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 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 30 and 31: 6, CARBURETOR SPECIFICATION I EY35
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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