Diagnosis and troubleshooting of motorcycle Yamaha YZF-R1 Y(C) (2009-2014)

General information about troubleshooting
The following guide for troubleshooting does not cover all the possible causes of trouble. It should be helpful, however, as a guide to basic troubleshooting. Refer to the relative procedure in this manual for checks, adjustments, and replacement of...

Starting failures
Engine 1. Cylinder(s) and cylinder head Loose spark plug Loose cylinder head or cylinder Damaged cylinder head gasket Damaged cylinder gasket Worn or damaged cylinder Incorrect valve clearance Improperly sealed valve Incorrect valve-to-valve-seat...

Incorrect engine idling speed
Engine 1. Cylinder(s) and cylinder head Incorrect valve clearance Damaged valve train components 2. Air filter Clogged air filter element Fuel system 1. Throttle body(-ies) Damaged or loose throttle body joint Improperly synchronized throttle bodies...

Poor medium and high speed performance
Refer to " Starting failures ". Engine 1. Air filter Clogged air filter element Faulty YCC-T and YCC-I Fuel system 1. Fuel pump Faulty fuel pump

Shift pedal does not move
Shift shaft Improperly adjusted shift rod Bent shift shaft Shift drum and shift forks Foreign object in a shift drum groove Seized shift fork Bent shift fork guide bar Transmission Seized transmission gear Foreign object between transmission gears...

Jumps out of gear
Shift shaft Incorrect shift pedal position Improperly returned stopper lever Shift forks Worn shift fork Shift drum Incorrect axial play Worn shift drum groove Transmission Worn gear dog

Faulty clutch
Clutch slips 1. Clutch Improperly assembled clutch Improperly adjusted clutch cable Loose or fatigued clutch spring Worn friction plate Worn clutch plate 2. Engine oil Incorrect oil level Incorrect oil viscosity (low) Deteriorated oil Clutch drags...

Overheating and overcooling of engine
Overheating Engine 1. Clogged coolant passages Cylinder head and piston(s) Heavy carbon buildup 2. Engine oil Incorrect oil level Incorrect oil viscosity Inferior oil quality Cooling system 1. Coolant Low coolant level 2. Radiator Damaged or leaking...

Poor braking performance
Poor braking performance: Worn brake pad Worn brake disc Air in hydraulic brake system Leaking brake fluid Faulty brake caliper kit Faulty brake caliper seal Loose union bolt Damaged brake hose Oil or grease on the brake disc Oil or grease on the...

Faulty front fork legs
Leaking oil Bent, damaged or rusty inner tube Cracked or damaged outer tube Improperly installed oil seal Damaged oil seal lip Incorrect oil level (high) Loose damper rod assembly Cracked or damaged cap bolt O-ring Malfunction Bent or damaged inner...

Unstable handling
1. Handlebars Bent or improperly installed right handlebar Bent or improperly installed left handlebar 2. Steering head components Improperly installed upper bracket Improperly installed lower bracket (improperly tightened ring nut) Bent steering...

Faulty lighting or signaling system
Headlight does not come on Wrong headlight bulb Too many electrical accessories Hard charging Incorrect connection Improperly grounded circuit Poor contacts (main or light switch) Burnt-out headlight bulb Headlight bulb burnt out Wrong headlight...