Poor Speed Performance; Overheating; Overcooling; Cooling System - Yamaha YFM7FGPW Service Manual

OVERHEATING/OVERCOOLING/FAULTY BRAKE

POOR SPEED PERFORMANCE

V-belt
• Oil or grease on the V-belt
Primary pulley weight
• Faulty operation
• Worn primary pulley weight
Primary fixed sheave
• Worn primary fixed sheave
EBS00546

OVERHEATING

OVERHEATING
Ignition system
• Improper spark plug gap
• Improper spark plug heat range
• Faulty ECU
Fuel system
• Faulty throttle body
• Damaged or loose throttle body joint
• Clogged air filter element
Compression system
• Heavy carbon build-up
EBS00548

OVERCOOLING

COOLING SYSTEM

Thermostat
• Thermostat stays open
EBS00550

FAULTY BRAKE

POOR BRAKING EFFECT

Disc brake
• Worn brake pads
• Worn disc
• Air in brake fluid
• Leaking brake fluid
• Faulty master cylinder kit cup
• Faulty caliper kit seal
• Loose union bolt
• Broken brake hose and pipe
• Oily or greasy disc/brake pads
• Improper brake fluid level
FAULTY CLUTCH PERFORMANCE/
10 - 5
Primary sliding sheave
• Worn primary sliding sheave
Secondary fixed sheave
• Worn secondary fixed sheave
Secondary sliding sheave
• Worn secondary sliding sheave
Engine oil
• Improper oil level
• Improper oil viscosity
• Inferior oil quality
Brake
• Brake drag
Cooling system
• Low coolant level
• Clogged or damaged radiator
• Damaged or faulty water pump
• Faulty fan motor
• Faulty coolant temperature sensor
TRBL
SHTG