Yamaha YZ250 2022 User Manual

CARBURETOR
7-7
8. Check:
• Free movement
Stick  Repair or replace.
TIP
Insert the throttle valve “2” into the carburetor
body while pulling up the lever “1”, and check for
free movement.
9. Check:
• Hose joint
Cracks/damage  Replace.
10.Check:
• Carburetor breather hose
• Fuel hose
Cracks/damage/wear  Replace.
Obstruction  Clean.
Blow out the hoses with compressed air.
EAM30574
CHECKING THE REED VALVE
1. Measure:
• Reed valve bending “a”
Out of limit  Replace.
• Valve stopper height “b”
Out of specification  Replace.
EAM30577
INSTALLING THE REED VALVE
1. Install:
• Reed valve “1”
• Reed valve stopper “2”
• Reed valve screw “3”
TIP
• Install the reed valve with the reed valve bend-
ing as shown.
• Note the cut “a” in the lower corner of the reed
valve and stopper.
• Tighten each screw gradually to avoid warping.
Valve bending limit
0.2 mm (0.01 in)
2
3
4
Valve stopper height
10.3–10.7 mm (0.41–0.42 in)
Reed valve screw
1.0 N·m (0.10 kgf·m, 0.73 lb·ft)
bb
T
R
.
.

Yamaha YZ250 2022 Specifications

General

Engine Type	249cc liquid-cooled 2-stroke; reed-valve inducted
Bore x Stroke	66.4mm x 72.0mm
Compression Ratio	8.9~10.6:1
Ignition	CDI
Transmission	5-speed; multiplate wet clutch
Final Drive	Chain
Suspension Rear	KYB® single shock; fully adjustable, 12.4-in travel
Brakes Front	Hydraulic disc, 270mm
Tires Front	80/100-21
Tires Rear	110/90-19
Seat Height	38.2 in
Wheelbase	58.5 in
Ground Clearance	14.2 in
Fuel Capacity	2.1 gal
Wet Weight	227 lb
Suspension Front	KYB® inverted fork; fully adjustable, 11.8-in travel
Brakes Rear	Hydraulic disc, 245mm