TECHNICAL TIPS
1-15
E
GEN
INFO
TECHNICAL TIPS
CARBURETOR
(1) Slow air jet (idling and slow speed operation)
Since the throttle valve is almost closed at low speeds, and thus the vacuum at venturi is
small, air/fuel mixture is not delivered through the main nozzle.
At idling, the fuel delivered from the pilot jet is mixed with the air delivered from the pilot air
jet.
Air and fuel mixed at the rate determined by the pilot screw adjustment, are supplied to the
engine through the pilot outlet located above the throttle valve.
Once the throttle valve is opened to go beyond the bypass holes during the slow-speed
operation, air/fuel mixture is fed through the bypass holes.
Fig. 11
Summary of Contents for 25BMH
Page 48: ...FEATURES AND BENEFITS GEN INFO 1 12 E COOLING SYSTEM Fig 7 ...
Page 49: ...1 12 CARACTERISTIQUES ET AVANTAGES GEN INFO F ...
Page 50: ...1 12 MERKMALE UND VORTEILE GEN INFO D ...
Page 51: ...1 12 CARACTERÍSTICAS Y VENTAJAS GEN INFO ES ...
Page 92: ...MAINTENANCE SPECIFICATIONS SPEC 2 8 E DIMENSIONS ...
Page 156: ...GENERAL CHK ADJ 3 26 E NOTE Grease the inner cable and the lock nut 2 Apply Yamaha grease D ...
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Page 446: ...Printed on recycled paper Printed in Japan Oct 2000 1 9 1 25BMH 30HMH YAMAHA MOTOR CO LTD ...