Motorcycle carburetor repair Yamaha XVS 1100 Drag Star (1998-2008)

Removing the carburetors
Order Job name/Part name Quantity Remarks Removing the carburetors Remove the parts in the order listed. Fuel tank Refer to " Fuel tank and seats ". 1 Air filter case assembly 1 2 Air ducts 3 3 Cylinder head breather hose 1 Disconnect 4 Air chamber...

Disassembling the carburetor
Order Job name/Part name Quantity Remarks Disassembling the carburetor. Disassemble the parts in the order listed. (1) Carburetor heater leads 2 (2) Carburetor heaters 2 12V 30W (3) Float chamber/gasket 1 (4) Float 1 (5) Needle valve set 1 (6) Main...

Checking the carburetors
The following procedure applies to all of the carburetors. 1. Check: carburetor body float chamber jet housing Cracks/damage → Replace. 2. Check: fuel passages Obstruction → Clean. a. Wash the carburetor in a petroleumbased solvent. Do not use any...

Assembling the carburetors
The following procedure applies to both of the carburetors. Caution! Before assembling the carburetors, wash all of the parts in a petroleum-based solvent. Always use a new gasket. 1. Install: coasting enricher diaphragm coasting enricher spring...

Installing the carburetors
1. Adjust: carburetor synchronization. Refer to " Synchronizing the carburetors ". 2. Adjust: engine idling speed Engine idling speed: 950-1050 r/min. Refer to " Adjusting the engine idling speed ". 3. Adjust: throttle cable free play Throttle cable...

Measuring and adjusting the fuel level
1. Measure: fuel level (a) Out of specification → Adjust. Fuel level (above the line on the float chamber): 4-5 mm a. Stand the motorcycle on a level surface. b. Place the motorcycle on a suitable stand to ensure that the motorcycle is standing...

Checking and adjusting the throttle position sensor
Note: Before adjusting the throttle position sensor, the engine idling speed should be properly adjusted. 1. Inspect: throttle position sensor a. Disconnect the throttle position sensor coupler. b. Connect the pocket tester (Ω x 1k) to the throttle...

Air induction system (AIS)
Air induction This system burns the unburned exhaust gases by injecting fresh air (secondary air) at the exhaust port. This is to reduce the output of the hydrocarbons. When there is negative pressure around the exhaust port, the reed valve opens...

Air induction system inspection
(1) Reed valve; (2) Air filter; (3) Orifice; (4) Carburetor joint (near cylinder); [A] To the front cylinder head; [B] To the rear cylinder head; [C] To the orifice; [D] To the carburetor joint (rear cylinder); [E] To the AIS valve 1. Inspect: hose...