2-1
GENERAL SPECIFICATIONS
SPECIFICATIONS
GENERAL SPECIFICATIONS
Model name:YZ250FZ (USA, CDN, AUS, NZ)
YZ250F (EUROPE, ZA)
Model code number: 17D5 (USA,CDN)
17D6 (EUROPE)
17D8 (AUS, NZ, ZA)
Dimensions: USA, CDN EUROPE AUS, NZ, ZA
Overall length 2,159 mm (85.00
in) 2,168 mm (85.35
in)2,166 mm (85.28
in)
Overall width 825 mm (32.48 in)←←
Overall height 1,303 mm (51.30
in) 1,304 mm (51.34
in)←
Seat height 988 mm (38.90 in) 991 mm (39.02 in) 990 mm (38.98 in)
Wheelbase 1,466 mm (57.72
in) 1,473 mm (57.99
in)←
Minimum ground clearance 375 mm (14.76 in) 377 mm (14.84 in) 376 mm (14.80 in)
Weight: With oil and fuel 102.0 kg (224.9 lb)
Engine: Engine type Liquid cooled 4-stroke, DOHC
Cylinder arrangement Single cylinder, forward inclined
Displacement 250 cm
3 (8.80 Imp oz, 8.45 US oz)
Bore × stroke 77.0 × 53.6 mm (3.03 × 2.11 in)
Compression ratio 13.5 : 1
Starting system Kickstarter
Lubrication system: Dry sump
Oil type or grade: Engine oil Recommended brand: YAMALUBE
SAE10W-30, SAE10W-40, SAE10W-50
SAE15W-40, SAE20W-40 or SAE20W-50
API service SG type or higher,
JASO standard MA
Oil capacity: Engine oilPeriodic oil change 0.95 L (0.84 Imp qt, 1.00 US qt)
With oil filter replacement 1.05 L (0.92 Imp qt, 1.11 US qt)
Total amount 1.20 L (1.06 Imp qt, 1.27 US qt)
Coolant capacity (including all routes): 1.00 L (0.88 Imp qt, 1.06 US qt)
Air filter: Wet type element
Fuel: Type Premium unleaded gasoline only with a research octane
number of 95 or higher.
Tank capacity 6.4 L (1.4 Imp gal, 1.69 US gal)
2
2-3
MAINTENANCE SPECIFICATIONS
MAINTENANCE SPECIFICATIONS
ENGINEItem Standard Limit
Cylinder head: Warp limit ---- 0.05 mm (0.002 in)
Cylinder: Bore size 77.00–77.01 mm (3.0315–3.0319 in) ----
Out of round limit ---- 0.05 mm (0.002 in)
Camshaft: Drive method Chain drive (Left) ----
Camshaft cap inside diameter 22.000–22.021 mm (0.8661–0.8670 in) ----
Camshaft outside diameter 21.959–21.972 mm (0.8645–0.8650 in) ----
Shaft-to-cap clearance 0.028–0.062 mm (0.0011–0.0024 in) 0.08 mm (0.003
in)
Cam dimensions
Intake "A" 30.330–30.430 mm (1.1941–1.1980 in) 30.230 mm
(1.1902 in)
Intake "B" 22.45–22.55 mm (0.8839–0.8878 in) 22.35 mm
(0.8799 in)
Exhaust "A" 30.399–30.499 mm (1.1968–1.2007 in) 30.299 mm
(1.1929 in)
Exhaust "B" 22.45–22.55 mm (0.8839–0.8878 in) 22.35 mm
(0.8799 in)
Camshaft runout limit ----0.03 mm
(0.0012 in)
Timing chain: Timing chain type/No. of links 92RH2010-114M/114----
Timing chain adjustm ent method Automatic ----
2-4
MAINTENANCE SPECIFICATIONS
Valve, valve seat, valve guide:Valve clearance (cold)IN 0.12–0.17 mm (0.0047–0.0067 in) ----
EX 0.17–0.22 mm (0.0067–0.0087 in) ----
Valve dimensions: "A" head diameter (IN) 22.9–23.1 mm (0.9016–0.9094 in) ----
"A" head diameter (EX) 24.4–24.6 mm (0.9606–0.9685 in) ----
"B" face width (IN) 2.26 mm (0.089 in)----
"B" face width (EX) 2.26 mm (0.089 in)----
"C" seat width (IN) 0.9–1.1 mm (0.0354–0.0433 in)1.6 mm (0.0630
in)
"C" seat width (EX) 0.9–1.1 mm (0.0354–0.0433 in)1.6 mm (0.0630
in)
"D" margin thickness (IN) 0.8 mm (0.0315 in)----
"D" margin thickness (EX) 0.7 mm (0.0276 in)----
Stem outside diameter (IN) 3.975–3.990 mm (0.1565–0.1571 in) 3.945 mm
(0.1553 in)
Stem outside diameter (EX) 4.460–4.475 mm (0.1756–0.1762 in) 4.430 mm
(0.1744 in)
Guide inside diameter (IN) 4.000–4.012 mm (0.1575–0.1580 in) 4.050 mm
(0.1594 in)
Guide inside diameter (EX) 4.500–4.512 mm (0.1772–0.1776 in) 4.550 mm
(0.1791 in)
Stem-to-guide clearance (I N) 0.010–0.037 mm (0.0004–0.0015 in) 0.08 mm (0.003
in)
Stem-to-guide clearance (E X) 0.025–0.052 mm (0.0010–0.0020 in) 0.10 mm (0.004
in)
Item
StandardLimit
2-6
MAINTENANCE SPECIFICATIONS
Piston pin bore inside diameter16.002–16.013 mm (0.6300–0.6304 in) 16.043 mm
(0.6316 in)
Piston pin outside diameter 15.991–16.000 mm (0.6296–0.6299 in) 15.971 mm
(0.6288 in)
Piston rings: Top ring:
Type Barrel----
Dimensions (B × T) 0.90 × 2.75 mm (0.04 × 0.11 in)----
End gap (installed) 0.15–0.25 mm (0.006–0.010 in) 0.50 mm (0.020
in)
Side clearance (installed) 0.030–0.065 mm (0.0012–0.0026 in) 0.12 mm (0.005
in)
2nd ring:
Type Taper----
Dimensions (B × T) 0.80 × 2.75 mm (0.03 × 0.11 in)----
End gap (installed) 0.30–0.45 mm (0.012–0.018 in) 0.80 mm (0.031
in)
Side clearance 0.020–0.055 mm (0.0008–0.0022 in) 0.12 mm (0.005
in)
Oil ring:
Dimensions (B × T) 1.50 × 2.25 mm (0.06 × 0.09 in)----
End gap (installed) 0.10–0.40 mm (0.004–0.016 in)----
Crankshaft: Crank width "A" 55.95–56.00 mm (2.203–2.205 in) ----
Runout limit "C" 0.03 mm (0.0012 in)0.05 mm (0.002
in)
Big end side clearance "D" 0.15–0.45 mm (0.0059–0.0177 in) 0.50 mm (0.02
in)
Small end free play "F" 0.4–1.0 mm (0.016–0.039 in)2.0 mm (0.08
in)
Item
StandardLimit
5-27
HANDLEBAR
• Clamp "6"
• The engine stop switch, clutch lever holder and clamp should be in-
stalled according to the dimensions
shown.
• Pass the engine stop switch lead in the middle of the clutch lever hold-
er.
12. Install:• Clutch cable "1"
• Hot starter cable "2"
Apply the lithium soap base grease
on the clutch cable end and hot start-
er cable end.
13. Adjust:
• Clutch lever free playRefer to "ADJUSTING THE
CLUTCH CABLE FREE PLAY"
section in the CHAPTER 3.
• Hot starter lever free play Refer to "ADJUSTING THE HOT
STARTER LEVER FREE PLAY"
section in the CHAPTER 3.
