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ENGINE
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exhaust
HOT CAMS DIRTBIKE CAMSHAFTS
MODEL NAME YEAR CAM SHAFT DESCRIPTION
MFG#
YAMAHA CONTINUED
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 exhaust capacity. Requires valve springs kit PART
#VSK4001. Uses stock auto decompres
4156-EXBLD
870349 229.95 G
YZ 250F
14-15 Stage 1 ITR: dual-cam motor: Intake and exhaust cams sold separately.
Excellent bottom-end and midrange increase. Uses stock valve springs.
4270-1IN
871652 199.95 G
YZ 250F
14-15 Stage 1 ITR: dual-cam motor: Intake and exhaust cams sold separately.
Excellent bottom-end and midrange increase. Includes auto-decompression
mechanism. Uses stock valve springs.
4271-1E
871653 199.95 G
YZ 250F
14-15 Stage 2 ITR: dual-cam motor: Intake and exhaust cams sold separately.
Excellent midrange to top end increase. Uses stock valve springs.
4272-2IN
871654 199.95 G
YZ 250F
14-15 Stage 2 ITR: dual-cam motor: Intake and exhaust cams sold separately.
Excellent midrange to top end increase. Includes auto-decompression mecha-
nism. Uses stock valve springs.
4273-2E
871655 199.95 G
YZ 250FX
15 Stage 1 ITR: dual-cam motor: Intake and exhaust cams sold separately.
Excellent bottom-end and midrange increase. Uses stock valve springs.
4298-1IN
871668 199.95 G
YZ 250FX
15 Stage 1 ITR: dual-cam motor: Intake and exhaust cams sold separately.
Excellent bottom-end and midrange increase. Includes auto-decompression
mechanism. Uses stock valve springs.
4299-1E
871669 199.95 G
YZ 250FX
15 Stage 2 ITR: dual-cam motor: Intake and exhaust cams sold separately.
Excellent midrange to top end increase. Uses stock valve springs.
4300-2IN
871670 199.95 G
YZ 250FX
15 Stage 2 ITR: dual-cam motor: Intake and exhaust cams sold separately.
Excellent midrange to top end increase. Includes auto-decompression mecha-
nism. Uses stock valve springs.
4301-2E
871671 199.95 G
YZ 400F
98-99 Dual-cam motor: intake and exhaust cams sold separately. Excellent mid-
range increase, improved throttle response, and smooth power delivery.
Intake sprocket factory preset at 105. Exhaust cam includes auto-decompres-
sion mechanism.
4002-1IN
870350 179.95 G
YZ 400F
98-99 Dual-cam motor: intake and exhaust cams sold separately. Excellent mid-
range increase, improved throttle response, and smooth power delivery.
Exhaust cam includes auto-decompression mechanism.
4035-1E
870351 199.95 G
WR 400F
98-00 Dual-cam motor: intake and exhaust cams sold separately. Excellent mid-
range increase, improved throttle response, and smooth power delivery.
Intake sprocket factory preset at 105. Exhaust cam includes auto-decom-
pression mechanism.
4002-1IN
870350 179.95 G
WR 400F
98-00 Dual-cam motor: intake and exhaust cams sold separately. Excellent mid-
range increase, improved throttle response, and smooth power delivery.
Exhaust cam includes auto-decompression mechanism.
4035-1E
870351 199.95 G
YZ 426F
00-02 Dual-cam motor: intake and exhaust cams sold separately. Excellent mid-
range increase, improved throttle response, and smooth power delivery.
Exhaust cam includes auto-decompression mechanism.
4002-1IN
870350 179.95 G
YZ 426F
00-02 Dual-cam motor: intake and exhaust cams sold separately. Excellent mid-
range increase, improved throttle response, and smooth power delivery.
Exhaust cam includes auto-decompression mechanism.
4035-1E
870351 199.95 G
WR 426F
01-02 Dual-cam motor: intake and exhaust cams sold separately. Excellent mid-
range increase, improved throttle response, and smooth power delivery.
Exhaust cam includes auto-decompression mechanism.
4002-1IN
870350 179.95 G
WR 426F
01-02 Dual-cam motor: intake and exhaust cams sold separately. Excellent mid-
range increase, improved throttle response, and smooth power delivery.
Exhaust cam includes auto-decompression mechanism.
4035-1E
870351 199.95 G
YZ 450F
03-09 Dual-cam motor: intake and exhaust cams sold separately. Excellent mid-
range and top-end increase. Exhaust cam includes auto-decompression
mechanism. Uses stock valve springs.
4022-1E
870356 199.95 G
YZ 450F
03-09 Stage 1: Dual cam engine. Intake and exhaust cams sold separately. Excel-
lent midrange and top-end increase. Uses stock valve springs.
4023-1IN
870353 199.95 G
YZ 450F
03-09 Stage 2 intake: Dual cam motor. Added top end over stage 1. Uses stock
valve springs.
4089-2IN
870357 199.95 G
YZ 450F
03-09 Stage 2 exhaust: Dual cam motor. Added top end over stage 1. Uses stock
valve springs. Include auto decompression mechanism.
4090-2E
870358 199.95 G
YZ 450F
10-13 THIS IS THE CAM SET THAT WILL SUIT MOST RIDERS IN MOST RIDING
SITUATIONS. 4163-1IN and 4164-1EX when used as a set provide increased
low - mid rpm torque up to 9000 rpm and improved peak torque with no loss
at high rpm. Throttle response is also improved.
4163-1IN
870359 199.95 G
YZ 450F
10-13 THIS IS THE CAM SET THAT WILL SUIT MOST RIDERS IN MOST RIDING
SITUATIONS. 4163-1IN and 4164-1EX when used as a set provide increased
low - mid rpm torque up to 9000 rpm and improved peak torque with a no loss
at high rpm.Throttle response is also improved
4164-1EX
870360 199.95 G