ENGINE - Automatic Distributors

ENGINE
Yamaha DIRT BIKE CONTINUED
HOT CAMS DIRT BIKE continued
YZ 400F 98-99 Dual-cam motor: intake and exhaust cams sold separately. Excellent midrange increase, improved
throttle response, and smooth power delivery. Intake comes with adjustable sprocket (factory preset
at 105). Exhaust cam includes auto-decompression mechanism.
Dual-cam motor: intake and exhaust cams sold separately. Excellent midrange increase, improved
throttle response, and smooth power delivery. Intake comes with adjustable sprocket (factory preset
at 105). Exhaust cam includes auto-decompression mechanism.
YZ 426 00-02 Dual-cam motor: intake and exhaust cams sold separately. Excellent midrange increase, improved
throttle response, and smooth power delivery. Intake comes with adjustable sprocket (factory preset
at 105). Exhaust cam includes auto-decompression mechanism.
Dual-cam motor: intake and exhaust cams sold separately. Excellent midrange increase, improved
throttle response, and smooth power delivery. Intake comes with adjustable sprocket (factory preset
at 105). Exhaust cam includes auto-decompression mechanism.
YZ 426F 01-02 Dual-cam motor: intake and exhaust cams sold separately. Excellent midrange increase, improved
throttle response, and smooth power delivery. Intake comes with adjustable sprocket (factory preset
at 105). Exhaust cam includes auto-decompression mechanism.
Dual-cam motor: intake and exhaust cams sold separately. Excellent midrange increase, improved
throttle response, and smooth power delivery. Intake comes with adjustable sprocket (factory preset
at 105). Exhaust cam includes auto-decompression mechanism.
YZ 450F 03-09 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.
Stage 1: Dual cam engine. Intake and exhaust cams sold separately. Excellent midrange and topend
increase. Uses stock valve springs.
Part #
Intake
Lift
Intake
Duration
Exhaust
Lift
Exhaust
Duration
870350 8.8 260 0 0 179.95
870351 0 0 8.76 259 199.95
870350 8.8 260 0 0 179.95
870351 0 0 8.76 259 199.95
870350 8.8 260 0 0 179.95
870351 0 0 8.76 259 199.95
870356 0 0 8.67 265 199.95
870353 8.86 269 0 0 199.95
Stage 2 intake: Dual cam motor. Call for details. Uses stock valve springs. 870357 8.89 260 0 0 199.95
Stage 2 exhaust: Dual cam motor. Call for details. Uses stock valve springs. Include auto decompression
mechanism.
870358 0 0 8.74 253.5 199.95
YZ 450F 03-09 Exhaust and Intake spring max lift at OE installed height 0.513”. 870352 0 0 0 0 199.95
YZ 450F 10-11 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
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 improv
4165-2IN and 4166-2E when used as a set provide increased mid-top torque and horsepower.
Produces more power than the OE cams from 6000 rpm and up with a slight loss at lower rpm.
Produces more power than the stage 1 set from 8000 rpm and up. Performance
4165-2IN and 4166-2E when used as a set provide increased mid-top torque and horsepower.
Produces more power than the OE cams from 6000 rpm and up with a slight loss at lower rpm.
Produces more power than the stage 1 set from 8000 rpm and up. Performance
The 4167-INBLD intake cam provides the lowest RPM torque. When used with the #4170-EXBLD,
the set makes a great torque set up good for Supercross and other riding situations which require
good throttle response and increased partial throttle torque. Uses
870359 9.4 250 0 0 199.95
870360 0 0 8.64 249 199.95
870361 9.78 265 0 0 199.95
870362 0 0 8.9 254 199.95
870363 8.9 249 0 0 295.95
This cam provides slightly more intake flow than the Stage 2 #4165-2IN. Uses stock valve springs. 870364 10.16 265 295.95
The 4169-INBLD provides the highest RPM air flow. When used as a set with the #4171-EXBLD
exhaust cam modified engines will produce good high RPM horsepower. Uses stock valve springs.
The 4170-EXBLD exhaust cam provides the lowest RPM torque. When used with the #4167-IN-
BLD, the set makes a great torque set up good for Supercross and other riding situations which
require good throttle response and increased partial throttle torque. Uses
The #4171-EXBLD exhaust cam is a good choice for high RPM power in modified engines. When
used as a set with the #4169-INBLD modified engines will produce good high RPM horsepower.
Uses stock valve springs.
870365 10.95 265 295.95
870366 0 0 8.64 249 295.95
870367 0 0 10.16 257 295.95
This cam provides slightly more exhaust flow than the #4171-EXBLD. Uses stock valve springs. 870368 0 0 10.16 265 295.95
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