Carburetor, Float System | Subaru Robin Power Products EY20V, EY15V

8. CARBURETOR

8 - 1 OPERATION and CONSTRUCTION (See figs . 49 and 50 . )

8- 1- 1 FLOAT SYSTEM

The float chamber is located just below the carburetor body and, with a float andneedle valve, maintains a constant fuel level during engine operation.

The fueI flows from the fuel tank into the float chamber through needlevalve. When the fuel rises t o a speci- fic level, the float rises; and when its buoyancy and fuel pressure are balanced, the needle valve closes to shut off the fuel, thereby keeping the fuel at the referencelevel.

By-path Holes	PilotValveChoke	Jet
Throttle Valve
Pilot Outlet		MainNozzle
Pilot Outlet
		-
		Main Air Jet
		Float
Bowl	Fuel	\ Main Jet

Fig. 49

Fig 50

- 33 -

Image 37

Subaru Robin Power Products EY20V, EY15V manual Carburetor, Float System

Contents

Page Wisconsin Robin Side Valve Contents Basic Theory ofT .I.C Model SPEC1FICATIONS Continuous Rated Output Performance Features Crankshaft CYLINDER,CRANKCASE Camshaft Connecting ROD and Piston6VALVEARRANGEMENT Cooling CylinderheadLubrication 112CARBURETOR 111IGNITION Model EY15V Sectional View of Engine Air Cleaner Muffler Cover Model EY20V Model EY20V Special Tools Preparations and Suggestions ApplicalbeShape Model Order 3HOW to Disassemble Tool Order Exhaust valve Main bearing cover Procedures Remarks OrderProcedures ~Sequesnceand precautionsin reassembling Precaution in reassemblingMOW to Reassemble Crankshaft EY15V Eyzov Dimensions of Crankshaft Pin Periphery.I Y20 5 Mainbearing Cover Valve and Valve Guide Clearance 6INTAKE and Exhaust Valves 7TAPPET Adjustment Kg-cm ’ 5-4-8CYLINDER Head Intake Manifold 1FUEL Tank Bracket 1 7 Recoil Starter 14AIRCLEANER To 6-3TIMING Adjustment BreakerpointadjustmentMagneto Magneto Timing Adjustment See Figs ,43 Spark Testing MagnetotroubleshootingSolidstate Ignition C. Transistorignitioncircuit Point where the governorspring is to be hooked GovernoradjustmentDiscrimination accordingto the dimensions Page 1 Float System Carburetor 2 Pilotsystem Disassembly and Reassembly1 Throttle System Float System BREAK-IN Operation of Reassembledengine IO. Robin Solid State Ignition Engine FeaturesBasic Theory of T.I.C. See Fig 11- 1-2 Compression System 11- 1 Starting Difficulties 11-2ENGINGEMIFIRES 11- 1-3ELECTRICAL System11-3ENGINE Stops 11- 4 Engine Overheats Enginebackfires through Carburetor Engineknocks Power Transmission to Drivenmachines InstallationVENT1LATION Exhaust Gasdischarge Breaker Point Ignition Type WiringSolid State Ignition Type Checks and Corrections Table of Correctionstandards 1.o 10*0.02 #20 220 Every 20 Hours Checks and Maintenance Daily Checks and Maintenance15-3EVERY 50 Hours IO Dayschecks and Maintenance Every 100 200 Hours Monthly Checks and Maintenance Every 1000 Hours Yearly Checks and Maintenance Every 500 600 Hours Semiannual Checks and MaintenancePREPARATiON for Longabeyance Page Page Page Page Industrial Engines