EasyManuals Logo

Yamaha YZ250F User Manual

Yamaha YZ250F
356 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #208 background imageLoading...
Page #208 background image
CAMSHAFT
5-15
c. Install the dowel pins and the camshaft
caps.
TIP
Tighten the camshaft cap bolts in a crisscross
pattern from innermost to outer caps.
Do not turn the camshaft when measuring the
camshaft journal-to-camshaft cap clearance.
d. Remove the camshaft caps and then mea-
sure the width of the Plastigauge® “1”.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
5. Measure:
Camshaft journal diameter “a”
Out of specification Replace the cam-
shaft.
Within specification Replace the cylinder
head and the camshaft caps as a set.
EAS1SM5211
CHECKING THE TIMING CHAIN AND CAM-
SHAFT SPROCKET
1. Check:
Timing chain “1”
Damage/stiffness Replace the timing
chain and camshaft as a set.
2. Check:
Camshaft sprocket
More than 1/4 tooth wear “a” Replace the
camshaft and the timing chain as a set.
EAS1SM5212
CHECKING THE TIMING CHAIN TENSION-
ERS
1. Check:
Timing chain tensioner
Crack/damage Replace.
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. While pressing the tensioner rod lightly with
your fingers, use a thin screwdriver “1” to
wind the tensioner rod up fully clockwise.
b. When releasing the screwdriver by pressing
lightly with your fingers, make sure that the
tensioner rod will come out smoothly.
c. If not, replace the tensioner assembly.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
Camshaft cap bolt
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
Camshaft journal diameter
21.959–21.972 mm (0.8645–
0.8650 in)
T
R
.
.
1
a. 1/4 tooth
b. Correct
1. Timing chain roller
2. Camshaft sprocket
a
b
1
2

Table of Contents

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Yamaha YZ250F and is the answer not in the manual?

Yamaha YZ250F Specifications

General IconGeneral
Displacement250cc
Bore x Stroke77.0 mm x 53.6 mm
Final DriveChain
Suspension / RearKYB® single shock; fully adjustable, 12.5-in travel
Brakes / FrontHydraulic single disc brake, 270mm
Brakes / RearHydraulic single disc brake, 240mm
Fuel Capacity1.6 gal
Engine TypeLiquid-cooled, DOHC, 4-stroke
Fuel DeliveryFuel injection
IgnitionTCI
Transmission5-speed; multiplate wet clutch
Suspension / FrontKYB® Speed-Sensitive System inverted fork; fully adjustable, 12.2-in travel
Tires / Front80/100-21

Related product manuals