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Model Type
Off-Road
Model Type
Off-Road
MSRP
$8,999
MSRP
$7,399
Warranty
1
Warranty
1
Insurance
Insurance
Finance
Finance
Generic Type (Primary)
Off-Road
Generic Type (Primary)
Off-Road
Manufacturer Country
Japan
Manufacturer Country
Japan
Introduction Year
2016
Introduction Year
-
Manufacturer Recommend Minimum Age
16
Manufacturer Recommend Minimum Age
16
Parent Company
Yamaha
Parent Company
Yamaha
Display Name
YZ 450FX
Display Name
YZ 250
Year
2018
Year
2018
Make
Yamaha
Make
Yamaha
Engine Type
Single-Cylinder
Engine Type
Single-Cylinder
Cylinders
1
Cylinders
1
Engine Stroke
4-Stroke
Engine Stroke
2-Stroke
Cooling
Liquid
Cooling
Liquid
Valves
4
Valves
0
Valves Per Cylinder
4
Valves Per Cylinder
0
Valve Configuration
DOHC
Valve Configuration
Reed Valve
Bore (mm/in)
97 / 3.82
Bore (mm/in)
66.4 / 2.62
Stroke (mm/in)
60.8 / 2.39
Stroke (mm/in)
72 / 2.84
Displacement (cc/ci)
449 / 27.4
Displacement (cc/ci)
249 / 15.2
Compression Ratio
12.5:1
Compression Ratio
-
Starter
Electric
Starter
Kick
Fuel Requirements
Regular
Fuel Requirements
Regular
Fuel Type
Gas
Fuel Type
Gas / Oil Premix
Turbocharged
No
Turbocharged
No
Supercharged
No
Supercharged
No
Carburetion Brand
Keihin
Carburetion Brand
Keihin
Fuel Injector
Yes
Fuel Injector
No
Fuel Injector Size (mm)
44
Fuel Injector Size (mm)
-
Carburetor
No
Carburetor
Yes
Carburetion Type
Fuel Injected
Carburetion Type
Carburetor
Compression Ratio (Secondary)
-
Compression Ratio (Secondary)
10.6:1
Number Of Carburetors
-
Number Of Carburetors
1
Carburetor Size (mm)
-
Carburetor Size (mm)
38
Transmission Type
Manual
Transmission Type
Manual
Number Of Speeds
5
Number Of Speeds
5
Overdrive
Yes
Overdrive
Yes
Primary Drive (Rear Wheel)
Chain
Primary Drive (Rear Wheel)
Chain
Reverse
No
Reverse
No
Gear Ratio (1/2/3/4/5)
-
Gear Ratio (1/2/3/4/5)
1.93 / 1.53 / 1.28 / 1.09 / 0.95
Wheels Composition
Aluminum
Wheels Composition
Aluminum
Tube / Tubeless
Tubed
Tube / Tubeless
Tubed
Chromed
Yes
Chromed
Yes
Tire Brand
Dunlop(R)
Tire Brand
Dunlop(R)
Front Tire Width
90
Front Tire Width
80
Front Tire Aspect Ratio
90
Front Tire Aspect Ratio
100
Front Wheel Diameter
21
Front Wheel Diameter
21
Rear Tire Width
120
Rear Tire Width
110
Rear Tire Aspect Ratio
90
Rear Tire Aspect Ratio
90
Rear Wheel Diameter
18
Rear Wheel Diameter
19
Front Tire (Full Spec)
Dunlop(R) AT81 90/90 R21
Front Tire (Full Spec)
Dunlop(R) MX52 80/100 R21
Rear Tire (Full Spec)
Dunlop(R) AT81 120/90 R18
Rear Tire (Full Spec)
Dunlop(R) MX52 110/90 R19
Front Tire Speed Rating
-
Front Tire Speed Rating
51M
Rear Tire Speed Rating
-
Rear Tire Speed Rating
62M
Front Brake Type
Hydraulic Disc
Front Brake Type
Hydraulic Disc
Front Brake Diameter (in/mm)
10.6 / 270
Front Brake Diameter (in/mm)
10.6 / 270
Rear Brake Type
Hydraulic Disc
Rear Brake Type
Hydraulic Disc
Rear Brake Diameter (in/mm)
9.7 / 245
Rear Brake Diameter (in/mm)
9.7 / 245
Front Suspension Type
Inverted Fork
Front Suspension Type
Inverted Fork
Front Travel (in/mm)
12.2 / 309.9
Front Travel (in/mm)
11.8 / 299.7
Front Adjustable Fork Pre-Load
Yes
Front Adjustable Fork Pre-Load
Yes
Front Adjustable Rebound Damping
Yes
Front Adjustable Rebound Damping
Yes
Front Central Suspension Strut
No
Front Central Suspension Strut
No
Front Suspension Brand Name
KYB
Front Suspension Brand Name
KYB
Steering Damper
No
Steering Damper
No
Rear Suspension Type
Twin Sided Swing Arm
Rear Suspension Type
Twin Sided Swing Arm
Rear Travel (in/mm)
12.5 / 317.5
Rear Travel (in/mm)
12.4 / 315
Rear Adjustable Shock / Spring Pre-Load
Yes
Rear Adjustable Shock / Spring Pre-Load
Yes
Rear Adjustable Rebound Damping
Yes
Rear Adjustable Rebound Damping
Yes
Number Rear Shock Absorbers
1
Number Rear Shock Absorbers
1
Rear Suspension Brand Name
KYB
Rear Suspension Brand Name
KYB
Rear Suspension Material
Aluminum
Rear Suspension Material
Aluminum
Air Adjustable
No
Air Adjustable
No
Front Suspension Size (in/mm)
-
Front Suspension Size (in/mm)
1.9 / 48
Steering Control
Handlebar
Steering Control
Handlebar
Length (ft)
7.1
Length (ft)
7.14
Width (in/mm)
32.5 / 825.5
Width (in/mm)
32.6 / 828
Height (in/mm)
50.4 / 1280.2
Height (in/mm)
51.4 / 1305.6
Wheelbase (in/mm)
57.7 / 1465.6
Wheelbase (in/mm)
58.3 / 1480.8
Ground Clearance (in/mm)
12.8 / 325.1
Ground Clearance (in/mm)
14.2 / 360.7
Length (ft/ft)
7
Length (ft/ft)
7
Length (ft/in)
1.2
Length (ft/in)
1.7
Wet Weight (lbs/kg)
262 / 118.8
Wet Weight (lbs/kg)
227 / 103
Fuel Capacity (gal/l)
2 / 7.6
Fuel Capacity (gal/l)
2.1 / 8
Engine Displacement to Weight (cc)
1.71
Engine Displacement to Weight (cc)
1.1
Seat Type
One-Piece
Seat Type
One-Piece
Adjustable
No
Adjustable
No
Seat Material
Vinyl
Seat Material
Vinyl
Seat Location
Driver
Seat Location
Driver
Folding
No
Folding
No
Seat Height (in/mm)
38 / 965.2
Seat Height (in/mm)
39.1 / 993.1
Number Of Seats
1
Number Of Seats
1
Frame
Aluminum
Frame
Aluminum
Body Material
Plastic
Body Material
Plastic
Hand Grips
Standard
Hand Grips
Standard
Foot Peg Location
Driver
Foot Peg Location
Driver
Adjustable
No
Adjustable
No
Chain Guard
Yes
Chain Guard
Yes
Chassis Protectors
Yes
Chassis Protectors
Yes
Drive Shaft Guard
No
Drive Shaft Guard
No
Engine Case Guard
No
Engine Case Guard
No
Fork Guards
Yes
Fork Guards
Yes
Saddle Bag Guard
No
Saddle Bag Guard
No
Tank Guard
No
Tank Guard
No
Belt Guard
No
Belt Guard
No
Hand Guards
No
Hand Guards
No
Brush Guard
No
Brush Guard
No
Exhaust Guard
No
Exhaust Guard
No
Light Guard
No
Light Guard
No
Fuel Tank Cover
No
Fuel Tank Cover
No
Front Fender
Standard
Front Fender
Standard
Rear Fender
Standard
Rear Fender
Standard
Top Crown
Standard
Top Crown
Standard
Stand Type
Kick
Stand Type
-
Handlebars
Standard
Handlebars
Standard
Handlebar Pads
Standard
Handlebar Pads
Standard
Skid Plate
Standard
Skid Plate
-
Fuel Level Warning Type
Gauge
Fuel Level Warning Type
-
Service Reminder
Standard
Service Reminder
-
Warranty (Months/Condition)
1 / Limited
Warranty (Months/Condition)
1 / Limited
Battery Warranty (Months)
0
Battery Warranty (Months)
0
Adjustable Handlebars
Standard
Adjustable Handlebars
Standard
Adjustable Levers
Standard
Adjustable Levers
Standard
Metallic
No
Metallic
No
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