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Yamaha XS750 1977-1979, XS850 1980-1981 Repair & Service Manual

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The 1977-1981 Yamaha XS750, XS850 Triples repair manual by Clymer, covers the following models:

  • Yamaha XS750, 1977-1979
  • Yamaha XS750II, 1977-1979
  • Yamaha XS850, 1980-1981
  • Yamaha XS850S, 1980-1981

Book Excerpt: 1977-1981 Yamaha XS750, XS850 Triples Repair Manual


The fuel system consists of the fuel tank, two shutoff valves with fuel filters, three Mikuni constant velocity carburetors, and an air cleaner.

The exhaust system consists of three exhaust pipes, a crossover pipe, and two mufflers.

This chapter includes service procedures for all parts of the fuel and exhaust system.


The air cleaner must be cleaned every 1,000 miles or more frequently in dusty areas.

Service the air cleaner element as described under Air Cleaner in Chapter Three.


An understanding of the function of each of the carburetor components and their relationship to one another is a valuable aid for pinpointing a source of carburetor trouble.

The carburetor's purpose is to supply and atomize fuel and mix it in correct proportions with air that is drawn in through the air intake.

At the primary throttle opening - at idle - a small amount of fuel is siphoned through the pilot jet by the incoming air.

As the throttle is opened further, the air stream begins to siphon fuel through the main jet and needle jet.

The tapered needle increases the effective flow capacity of the needle jet, as it is lifted with the air slide, in that it occupies decreasingly less of the area of the jet.

In addition, the amount of cutaway in the leading edge of the throttle slide aids in controlling the fuel/air mixture during partial throttle openings.

At full throttle, the carburetor venturi is fully open and the needle is lifted far enough to permit the main jet to flow at full capacity.

This chapter includes repair and replacement procedures for the rear wheel, final drive unit, and rear suspension components.

(Refer to Figure 1 for this procedure)

  1. Place the bike on the center stand or block up the engine so that the rear wheel clears the ground.
  2. Raise seat and remove the 2 bolts (Figure 2) securing the rear fender. Raise the fender and reinstall the bolts to hold fender in the raised position.
  3. On Models D and 2D: Loosen the clamps (Figure 3) securing the mufflers to the exhaust pipes. Remove the bolts (Figure 4) securing the mufflers to the frame; remove both mufflers.

Subject: 1977, 1978, 1979, 1980, 1981 Yamaha XS750, XS850 service, maintenance, repair. ISBN-10: 0892872438 | ISBN-13: 9780892872435 | Clymer M404


  • General Information
  • Troubleshooting
  • Lubrication, Maintenance and Tune-up
  • Engine
  • Clutch and External Gearshift Linkage
  • Transmission and Internal Shift Mechanism
  • Fuel and Emission Systems
  • Exhaust System
  • Electrical System
  • Wheels, Tires and Drive Chain
  • Front Suspension and Steering
  • Rear Suspension
  • Brakes
  • Body and Frame
  • Wiring Diagrams

  • Publisher: Clymer Series / Haynes Manuals
  • Pages: 280 - Hundreds of b&w photos and illustrations
  • Binding: Paperback - 7 x 10 inches
  • ISBN: 978-0-89287-243-5
  • Years: 1977 - 1981
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