Diagnosis and troubleshooting of motorcycle Yamaha XVS 1100 Drag Star (1998-2008)

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Engine starting failure/hard starting
Fuel system Fuel tank Empty Clogged fuel filter Clogged fuel strainer Clogged fuel tank drain hose Clogged roll-over valve Clogged roll-over valve breather hose Deteriorated or contaminated fuel Fuel cock Clogged fuel hose Carburetor Deteriorated or...

Poor idle speed performance
Carburetor Improperly returned starter plunger Loose pilot jet Clogged pilot air jet Improperly synchronized carburetors Improperly adjusted idle speed (throttle stop screw) Improper throttle cable free play Flooded carburetor Electrical system...

Poor medium-and high-speed performance
Refer to "Starting failure/hard starting". (Fuel system, electrical system, compression system and valve train) Carburetor Faulty diaphragm Improperly adjusted fuel level Clogged or loose main jet Air filter Clogged air filter element Fuel pump...

Faulty gear shifting
Hard shifting Refer to "Clutch dragging". Shift pedal does not move Shift shaft Improperly adjusted shift pedal link Bent shift shaft Shift cam, shift fork Groove jammed with impurities Seized shift fork Bent shift fork guide bar Transmission Seized...

Clutch slipping/dragging
Clutch slipping Clutch Improperly adjusted clutch cable Loose clutch spring Fatigued clutch spring Worn friction plate / clutch plate Incorrectly assembled clutch Engine oil Improper oil level Improper viscosity (high) Deterioration Clutch dragging...

Engine overheating
Ignition system Improper spark plug gap Improper spark plug heat range Faulty ignitor unit Fuel system Improper carburetor main jet setting Improper fuel level Clogged air filter element Compression system Heavy carbon build-up Engine oil Improper...

Poor braking performance
Disc brake Worn brake pad Worn disc Air in brake fluid Leaking brake fluid Faulty cylinder kit cup Faulty caliper kit seal Loose union bolt Broken brake hose Oily or greasy disc / brake pad Incorrect brake fluid level

Front fork oil leakage and front fork malfunction
Malfunction Bent, deformed or damaged inner tube Bent or deformed outer tube Damaged fork spring Worn or damaged slide metal Bent or damaged damper rod Improper oil viscosity Improper oil level Oil leakage Bent, damaged or rusty inner tube Damaged...

Unstable handling
Handlebar Improperly installed or bent Steering Improperly installed handlebar crown Bent steering stem Improperly installed steering shaft (improperly tightened ring nut) Damaged ball bearing or bearing race Swingarm Worn bearing or bushing Bent or...

Faulty lighting and signal systems
Headlight does not light Improper bulb Too many electric accessories Hard charging (broken stator coil wire, faulty rectifier/regulator) Incorrect connection Improperly grounded Poor contacts (main or lights switch) Bulb life expired Flasher does...

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