Yamaha F2 5 Service Manual
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Page 51
69M3E114-2 1 2 3 4 5 6 7 8 9 Hose routing4 Fuel and blowby hoses 1Fuel hose 2Blowby hose 3Blowby hose S69M4000 1 2 3 Special service tools / Hose routing
Page 52
FUELFuel system 4-369M3E11 Fuel tank4 No. Part name Q’ty Remarks 1 Fuel tank 1 2 Fuel filter 1 3 Fuel filler cap 1 4 Stopper 2 5 Chain 1 6 Stopper 1 7Gasket 1 8Bolt 3 M6 × 35 mm 9Grommet 3 10 Collar 3 11 Clip 1 12 Fuel hose 1 13 Damper 1 14 Clip 1 S69M4010 13 14 12 1129 10 8 13 4 7 6 5
Page 53
69M3E114-4 1 2 3 4 5 6 7 8 9 Carburetor and intake silencer4 No. Part name Q’ty Remarks 1 Carburetor 1 2 Intake silencer 1 3 Blowby hose 1 4Bolt 2 M6 × 75 mm 5 Collar 2 6O-ring 1 Not reusable 7 Plastic tie 1Not reusable 8Hose 1 9 Fuel cock 1 10 Gasket 1 Not reusable 11 Gasket 1 12 Gasket 1 Not reusable 13 Throttle cable 1 14 O-ring 1 15 Fuel cock lever 1 16 Screw 1ø5 × 7 mm S69M4020 13 7 8 3 4 5 2 6 9 1 10 11 12 15 1614 13 Fuel tank / Carburetor and intake silencer
Page 54
FUELFuel system 4-569M3E11 Carburetor4 No. Part name Q’ty Remarks 1 Carburetor body 1 2Screw 3ø4 × 10 mm 3 Cover 1 4Gasket 1 Not reusable 5Screw 1ø4 × 8 mm 6O-ring 1 Not reusable 7 Fuel cock 1 8 Main nozzle 1 9 Main jet 1 10 Pilot jet 1 11 Bushing 1 12 Float 1 13 Float pin 1 14 Screw 1ø4 × 5 mm 15 Needle valve 1 16 Gasket 1 Not reusable 17 Float chamber 1 S69M4032 18 1917 161514 1311 10 8 9 12 5 7 6 1 432 20 21 22 È AA 22 AA
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69M3E114-6 1 2 3 4 5 6 7 8 9 4 ÈFor Europe No. Part name Q’ty Remarks 18 Screw 2ø4 × 10 mm 19 Drain screw 1 20 Spring 1 21 O-ring 1 Not reusable 22 Pilot screw 1 S69M4032 18 1917 161514 1311 10 8 9 12 5 7 6 1 432 20 21 22 È AA 22 AA Carburetor
Page 56
FUELFuel system 4-769M3E11 Draining the fuel WARNING Before removing the fuel tank, fuel hose, and carburetor, let the fuel drain com- pletely. 1. Loosen the air vent screw 1 attached to the fuel filler cap. 2. Set the fuel cock lever 2 to the open position. 3. Place a drain pan under the drain hose, and then loosen the drain screw and let the fuel drain completely. Checking the fuel tank and fuel filler cap 1. Check the fuel tank and fuel filler cap for cracks, leaks, or damage. Replace if nec-...
Page 57
69M3E114-8 1 2 3 4 5 6 7 8 9 2. Blow compressed air into all passages and jets. CAUTION: •Direct the compressed air downward, otherwise cleaning solvent may be blown into your eyes or small parts of the carburetor may be blown off. •Do not use steel wire for cleaning the jets, otherwise the jet diameters may be enlarged, which may seriously affect performance. 3. Check the main jet 1 , pilot jet 2 , and main nozzle 3 for dirt or residue. Clean if necessary. 4. Check the pilot screw and needle valve for...
Page 58
FUELFuel system 4-969M3E11 Assembling the carburetor 1. Install the main nozzle 1 , main jet 2 , pilot jet 3 , and bushing 4 to the carbu- retor body as shown. 2. Install the needle valve 5 , float 6 , float pin 7 , and screw 8 as shown, and then check the float for smooth operation. NOTE: Place the needle valve in the valve seat when installing the float to the carburetor body. Fit the float pin into the slit on the carbure- tor body and lock it with the screw. 3. Install the pilot screw 9 , turn it...
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69M3E114-10 1 2 3 4 5 6 7 8 9 2. Install the choke wire 4 to the choke lever 5 of carburetor. Installing the throttle cable 1. Turn the throttle grip to the fully closed position. 2. Make the inner wire 1 of the throttle cable taut, and then connect the throttle link 2 . 3. Check that the throttle link 2 contacts the fully open stopper a when the throt- tle grip is turned from the fully closed position to the fully open position. Adjusting the pilot screw 1. Start the engine and warm it up for 5...
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FUELFuel system 4-1169M3E11 3. Turn the pilot screw 2 in direction a until it is lightly seated, then in direction b to the specified number of turns. ÈFor Europe 4. Turn the throttle stop screw 4 in direc- tion c or d until the specified engine idle speed is obtained. NOTE: To increase the idle speed, turn the throttle stop screw in direction c . To decrease the idle speed, turn the throttle stop screw in direction d . 5. After adjusting the idle speed, rev the engine a few times and let it idle...