Yamaha F50 Service Manual
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62Y3A114-12 1 2 3 4 5 6 7 8 I No. Part name Q’ty RemarksTightening torques Stage N·mkgf·mft·lb 1 Carburetor assembly 1 Joint-to-silencer 2 Clip 1 3 Blowby hose 1 4 Prime Start coupler 1 5Bolt 2 M6 × 30 mm 6Collar 2 7 Throttle link rod 1 8 O-ring 8 Not reusable 9 Insulator 1 10 Dowel pin 2 11 Bolt 8 M6 × 25 mm 12 Fuel hose 2 Fuel pump-to-carburetor 13 Clip 2 14 Rivet 2 Carburetor unit
62Y3A114-14 1 2 3 4 5 6 7 8 I No. Part name Q’ty RemarksTightening torques Stage N·mkgf·mft·lb 1 Acceleration pump 1 2 Screw 3 M5 × 9 mm 3Link rod 1 4 Hose 1 Acceleration pump-to- acceleration pump 5 Hose 4 Acceleration pump-to- carburetor 6Link rod 1 Carburetor unit
62Y3A114-16 1 2 3 4 5 6 7 8 I No. Part name Q’ty RemarksTightening torques Stage N·mkgf·mft·lb 1 Carburetor 4 2 Silencer 1 3 Plastic tie 1 Not reusable 4 Blowby hose 1 Silencer-to-joint 5Bolt 8 M6 × 90 mm 6Collar 8 7 O-ring 4 Not reusable 8Plate 1 9 O-ring 4 Not reusable 10 O-ring 4Not reusable 11 Joint 1 12 Plastic tie 7 Not reusable 13 Fuel hose 4 Carburetor-to-carburetor 14 Fuel hose 2 Carburetor-to-fuel pump Carburetor unit
62Y3A114-18 1 2 3 4 5 6 7 8 I È Carburetors #1, #2, and #3 É Carburetor #4 Ê Carburetors #1 and #3 No. Part name Q’ty RemarksTightening torques Stage N·mkgf·mft·lb 1 Carburetor body 1 2 Screw 4 M4 × 13 mm 3 Cover 1 4 Seal 1 Not reusable 5 Pilot jet 1 6Main jet 1 7 Needle valve 1 8 Main nozzle 1 9 O-ring 1 Not reusable 10 Plug 1 11 Float 1 12 Screw 1 M4 × 6 mm 13 Float pin 1 14 Gasket 1 Not reusable 15 Float chamber 1 16 Drain screw 1 17 O-ring 1 Not reusable 18 Screw 4 M4 × 13 mm 19 Fuel hose 1 Float chamber-to-body 20 Prime Start 1 21 Screw 1 M4 × 7 mm 22 O-ring 1 Not reusable 23 Bracket 1 24 Body 1 25 Screw 2 Carburetor #1: M4 × 17 mm Carburetor #3: M4 × 22 mm 26 Gasket 1 Not reusable 27 Spring 1 28 O-ring 1 Not reusable 29 Pilot screw 1 Carburetor
FUELFuel system 4-1962Y3A11 Checking the carburetor 1. Check the air and fuel passages and jets, for dirt and foreign matter. Clean the car- buretor body with a petroleum based sol- vent if necessary. 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 bends or wear. Replace if necessary. S62Y4230 3 2 1
62Y3A114-20 1 2 3 4 5 6 7 8 I 5. Check the float for deterioration. Replace it necessary. 6. Measure the float height a . Replace the float and needle valve, if out of specifica- tion, as a set. NOTE: The float should be resting on the needle valve 4 , but not compressing it. Take measurements at the top of the float flange opposite its pivoted side. Checking the Prime Start 1. Measure the length of the Prime Start plunger. 2. Connect the positive Prime Start blue (L) lead and the negative Prime Start black (B) lead to a battery as shown. 3. Measure the plunger length a after applying power for 5 minutes. Replace if out of specification. Assembling the carburetor 1. Install the main nozzle 1 , plug 2 , pilot jet 3 , and main jet 4 to the carburetor body as shown. Float height a : 10.0 ± 0.5 mm (0.39 ± 0.02 in) Prime Start plunger extended length a : 24.6 mm (0.97 in) S62Y4270 4 32 1 Carburetor
FUELFuel system 4-2162Y3A11 2. Install the needle valve 5 , float 6 , float pin 7 , and screw 8 as shown, and then the 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 in until it is lightly seated, then out the specified number of turns. Adjusting the throttle link rod 1. Push the throttle control lever 1 to the fully open position as shown, and then measure the gap between the carburetor throttle lever 2 and carburetor stopper 3 . 2. If out of specification, adjust the throttle link rod length. 3. Remove the throttle link rod 4 , adjust it to the specified length b , and then install it. Pilot screw setting: Carburetors #1, #2, and #3: 2 1/4 ± 1/2 turns out Carburetor #4: 2 1/2 ± 1/2 turns out S62Y4280 7 5 8 6 Gap a: Less than 0.5 mm (0.02 in) Throttle link rod length b: 144 mm (5.67 in)