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 |
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