ENGINE
393
2015 OFFROAD CATALOG
accessories
body
handlebar
& grips
cables &
levers
engine
fuel &
intake
electrical
& ignition
clutch
drive
bearings
brakes
steering &
suspension
tires
tools &
shop
exhaust
MODEL
YEAR
DESCRIPTION
CAMSHAFTS
SHIM KIT
EXHAUST
DURATION
EXHAUST
LIFT
EXHAUST
LOBE
CENTER
EXHAUST
VALVE
LASH
INTAKE
DURATION
INTAKE
LIFT
INTAKE
LOBE
CENTER
INTAKE
VALVE
LASH
YAMAHA CONTINUED
WR 450F 03-14 Dual-cam motor: intake and exhaust cams
sold separately. Excellent midrange and
top-end increase. Exhaust cam includes auto-
decompression mechanism. Uses stock valve
springs.
870353 199.95
G
870967 89.95
G 0
0
0
0
269 8.86 110 0.15
WR 450F 03-14 Dual-cam motor: intake and exhaust cams
sold separately. Excellent midrange and
top-end increase. Exhaust cam includes auto-
decompression mechanism. Uses stock valve
springs.
870354 199.95
G
870967 89.95
G 265 8.67 103
0.2
0
0
0
0
YZ 250F 01-13 Builder Series: Dual cam engine. Intake and
exhaust cams sold separately. High lift and
long duration for high RPM applications or
oversized engines requiring increased intake
capacity. Requires valve springs kit PART
#VSK4001.
870347 229.95
G
870966 89.95
G 0
0
0
0
265 9.27 111 0.15
YZ 250F 01-13 Builder Series: Dual cam engine. Intake and
exhaust cams sold separately. Lower lift and
shorter duration for low RPM or high torque
applications. Requires valve springs kit PART
#VSK4001.
870344 229.95
G
870966 89.95
G 0
0
0
0
247 8.38 103 0.15
YZ 250F 01-13 Builder Series: Dual cam engine. Intake and
exhaust cams sold separately. Lower lift and
shorter duration for low RPM or high torque
applications. Requires valve springs kit PART
#VSK4001. Uses stock auto decompression
mechanism.
870348 229.95
G
870966 89.95
G 248 8.05 98.5
0.2
0
0
0
0
YZ 250F 01-13 Builder Series: Dual cam engine. Intake and
exhaust cams sold separately. Medium lift and
duration for mid RPM applications. Requires
valve springs kit PART #VSK4001.
870345 295.95
G
870966 89.95
G 0
0
0
0
251 8.38 104.5 0.15
YZ 250F 01-13 Builder Series: Dual cam engine. Intake and
exhaust cams sold separately. Medium lift and
duration for mid RPM applications. Requires
valve springs kit PART #VSK4001.
870346 229.95
G
870966 89.95
G 0
0
0
0
255 8.89 106 0.15
YZ 250F 01-13 Dual-cam motor: intake and exhaust cams sold
separately. Excellent top-end power increase
and good over rev. Intake cam includes
adjustable cam timing sprocket. Exhaust cam
includes auto-decompression mechanism.
Uses stock valve springs.
870338 199.95
G
870966 89.95
G 0
0
0
0
256 8.5 111.5 0.15
YZ 250F 01-13 Dual-cam motor: intake and exhaust cams sold
separately. Excellent top-end power increase
and good over rev. Intake cam includes
adjustable cam timing sprocket. Exhaust cam
includes auto-decompression mechanism.
Uses stock valve springs.
870339 199.95
G
870966 89.95
G 252
8.5 102.5 0.2
0
0
0
0
YZ 250F 01-13 Stage 1 Gold Series: Dual cam engine. Intake
and exhaust cams sold separately. Low to
mid RPM application. Requires valve spring
kit PART #VSK4001EX. Uses stock auto
decompression mechanism.
870341 229.95
G
870966 89.95
G 256 8.13 108
0.2
0
0
0
0
YZ 250F 01-13 Stage 1 Gold Series: Dual cam engine. Intake
and exhaust cams sold separately. Low to mid
RPM application. Requires valve spring kit
PART #VSK4001IN.
870340 229.95
G
870966 89.95
G 0
0
0
0
251 8.5 106 0.15
YZ 250F 01-13 Stage 1: Dual cam engine. Intake and exhaust
cams sold separately. Increases bottom and
midrange power for improved snap. Cam
includes auto-decompressor mechanism. Uses
stock valve springs.
870337 199.95
G
870966 89.95
G 252
8.1
104
0.2
0
0
0
0
YZ 250F 01-13 Stage 1: Dual cam engine. Intake and exhaust
cams sold separately. Increases bottom and
midrange power for improved snap. Comes
with adjustable sprocket. Uses stock valve
springs.
870336 199.95
G
870966 89.95
G 0
0
0
0
249 8.48 106 0.15
HOT CAMS DIRT BIKE
continued
