CRF250X changes from 2006 to 2007

November 28, 2006 version

Changes for 2007 include:

- New cylinder-head porting inspired by the CRF250R.
- New piston and rings from the CRF250R.
- Revised ignition mapping.
- Carburetor features new accelerator pump and linkage for improved throttle response.
- New one-piece cover protects throttle cable by keeping out dirt and water.
- New front hub is lighter and stronger.
- Stronger clutch basket and clutch center for improved wear resistance.
- Lighter weight rear chain guide.

Here are the differences, in Parts Catalog order. If a part is different between 49-state and CA, each number is shown. If they are the same, only one number is shown. Many of these new '07 parts will work on '04, '05, and '06 models; check with your dealer (yeah, right).

Description Part number Comment
Cylinder head assy
Gasket, cylinder head
Joint, water
Bolt, flange (6x20)
12010-KSC-A10
12251-KRN-731
19523-KRN-730
96001-06020-00
New porting, CA and 49-state use same head
? suspect change in comp ratio
Different bend, from 250R
New water joint mounting bolt
Spring, decompression
Shaft, ex rocker arm
Lifter, valve
Retainer, valve spring
14106-KRN-A00
14451-KSC-671
14731-KRN-A00
14771-KRN-A00
? stronger
? heat treatment
Better, from 250R
Better, from 250R
Washer (18mm) 90581-701-000
90581-831-650
Larger washer, 2 types
Gasket, R cover
Bolt, flange (6x10)(NSHF)
11394-KRN-A00
90004-GHB-600
? from 250R
New tranny oil check bolt, flange type
Clutch (outer)
Center, clutch
22100-KSC-A10
22120-KRN-A00
Stronger clutch basket and clutch center
for improved wear resistance
Impeller, water pump
Cover, water pump
Seal, water pump
Pin A, dowel (8x10)
19215-KRN-A00
19221-KRN-A00
91211-KSE-671
94301-08100
Better, from 250R
Better, from 250R
Better, from 250R
Longer, from 250R
Alternator assy, flywheel type 31100-KSC-A11 In response to reported problems?
Crankcase, R
Gasket, crankcase
Crankcase, L
Lever, clutch lifter
Screw, special flat (6x17)
Orifice (#170)
Oil seal (39x56x7.5)
11100-KSC-A10
11191-KRN-850
11200-KSC-A10
22810-KSC-A10
90001-MEN-850
90901-KRN-A00
91202-MEY-671
To accomodate wider seal and larger tranny bearings
 
 
 
 
From 250R
Wider seal
Crankshaft
Ring set, piston (STD)
Piston
13000-KSC-A10
13011-KRN-850
13101-KRN-850
?
From 250R
From 250R
Shaft, balancer
Gear, balancer driven (32T)
13420-KSC-A10
13422-KSC-A10
?
?
Shaft, main (13T)
Countershaft
Bearing, radial ball (22x52x14)
Bearing, radial ball (17x38x10)
23210-KSC-A10
23221-KSC-A10
91005-KRN-A01
91006-KRN-A01
In response to reported problems?
 
Larger
Larger
Drum, gearshift 24311-KRN-A00 In response to reported problems?

Carb assy (CRF02B.A) 49-state
Carb assy (CRF03B.A) CA
16100-KSC-A12
16100-KSC-L12
New accelerator pump and linkage (and other parts)
for improved throttle response
Valve set, float
Screw set A
Arm set, link
Diaphragm set, pump
Screw set B
Screw set, jet needle
Shaft set, throttle
Lever set, pump
Sensor assy, throttle
Bolt, cover
Valve, throttle
Cover, throttle
Holder, needle jet
16011-MEN-851
16016-KSC-A11
16018-MEY-A11
16021-MEN-A01
16028-MEN-A01
16029-MEY-A11
16032-KSC-A11
16033-KSC-A11
16060-KSC-A11
16080-HP1-601
16112-MEY-A11
16157-MEN-A01
16165-MEY-A11
Float needle valve
Fuel screw, spring, washer
Internal slide link
Accelerator pump body and diaphragm
Idle screw set assembly
Needle holder assembly
Throttle drum
Accel pump lever, springs, screw
Throttle position sensor (TPS)
Throttle drum cover mounting bolt
Slide
Throttle drum cover
Main jet holder
Needle set, jet (NJNT)
Needle set, jet (NJPU)
16203-KSC-A12
16203-KSC-L12
49-State needle
CA needle
Note - these needles don't match the Service Manual nor Owner's Manuals
Jet, leak (ACCP)
Chamber set, float
Bolt, break head
Screw, pan
Clip
99108-KSC-0600
16015-KSC-A11
16083-HP0-A01
16083-MEB-671
16088-KRN-A01
49-state leak jet
Float bowl assembly
TPS mounting bolt
?
TPS wire clip

Cable assy, throttle
Cable, hot starter
Cable, clutch
Switch assy, engine stop
Housing, throttle (upper)
Housing, throttle (lower)
Bolt, handle lever pivot
Bolt, flange (6x20)
Hose, FR brake
17900-KSC-A10
17950-KSC-010
22870-KSC-770
35130-KSC-770
53167-MEB-672
53168-KSC-010
90113-MEY-A10
96001-06020-07
45125-KSC-A11
New throttle cables and rubber cover
?
CA gets 49-state clutch cable
?
New throttle housing
New throttle housing
?
?
?

Shroud set, R radiator
Shroud set, L radiator
19071-KSC-A10ZA
19072-KSC-A10ZA
BNG
BNG
Seat
Leather, seat (no letters printed)
Bolt, special (8mm)
77100-KSC-A10
77101-KSC-A10
99102-MEN-710
?
?
New bolt replaces bolt and collar
Air cleaner section See parts catalog Changes to 49-state model for secondary air system
Air suction valve section See parts catalog Changes to 49-state model for secondary air system
Arrester assy 18355-KSC-A10 ?
Shaft, brake pivot
Washer (26x10.5)
46513-KSC-A10
90512-KRN-730
?
?
Guide, chain
Swingarm, sub-assy, rr
Plate, chain guide
52146-MEN-J00
52200-KRN-J00
52147-MEN-J00
Lighter
250R swingarm
Lighter
Rod sub-assy, cushion conn.
Bolt, link (12x92)
Bolt, link (12x82)
Bearing, needle (20x26x15)
52479-KSC-A10
90131-MEN-840
90131-MEN-840
91051-KSC-003
Includes new wider shock connecting link
?
?
Wider, see rod sub-assy
Cable, starter magnetic battery
Cable, starter motor
Cable, battery ground
32401-KSC-A10
32410-KSC-A10
32601-KSC-A10
New battery cables
 
 
Module, ignition control (CDI)
Wire harness
30410-KSC-A11
32100-KSC-A10
Revised ignition mapping
?
Radiator, R
Radiator, L
Tube, reserve tank drain
19010-KSC-A11
19015-KSC-A11
19105-KSC-A10
?
?
?
Rubber, tank guard 50283-MEN-A00 ?
Mark, R radiator shroud
Mark, L radiator shroud
87126-KSC-A10ZA
87127-KSC-A10ZA
BNG
BNG

      ? means I don't know what is different about the new part; if you know, please let me know.

 

Notable unchanged items include:

Cam

Valve assemblies, mostly (valves, valve springs, valve spring seats, valve cotters, shims unchanged)

Cylinder and gasket

Clutch plates and clutch springs

Exhaust pipe and muffler

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