CR125 Question

Related:
Create New Tag

2/19/2018 7:26 AM

Can anyone explain the differences between the 2000-2007 CR 125s?

I believe the 05-07 have different heads

Reason I'm wondering is because I'm actively searching for the 05-07 but I'm not having any luck, so I'm wondering if I find say an 03 or 04 how much of a difference they are and what it would take to make it have the same components as the very last gen.

I got retired from supermini's in 09 and rode Honda's so I had to jump to 250F's so please excuse my ignorance haha

Thanks in advance!

|

2/19/2018 9:51 AM

2002: First year of 3rd generation chassis. Weak motors but workable seeing that they're the only Gen3 bikes that the older HPP cylinders interchange with.

2003: Slow as well, with engine revisions and different reed block.

2004: Stay away if possible. One year design on electronic power valve and select one-off parts available for 2004 only. Updated plastics, however, and newer front brake design.

2005-2007: Effectively the same bikes, minus bold new graphics. Better cylinder design (with port layout that resembles that of YZ125's) and revised shock length from earlier years.


The handling of all these bikes is simply amazing! Forks are 46mm KYB bladder design that can be swapped to 47mm Showas with no triple clamp change necessary (good mod, in my opinion). They came with Mikuni carbs (long-body for 02/03 and TPS equipped short-body for 04/07?) and a common mod is to swap to the easier to maintain Keihins

Light, well-built, with parts readily available; Can't go wrong! Wouldn't pass on any particular year if the price was right. Not as fast as modern one-two-five offerings, but solid nonetheless cool

|

2/19/2018 10:07 AM

2004 was not good. It was a toad!

Paw Paw

|

2/19/2018 10:22 AM

crc245 wrote:

2002: First year of 3rd generation chassis. Weak motors but workable seeing that they're the only Gen3 bikes that the older ...more

so if i understand correctly, if i find a 2003 and throw an 05-07 cylinder on it and add 10mm to the rear shock clevis then i’ll essentially have an 05-07?

|

2/19/2018 11:37 AM

crc245 wrote:

2002: First year of 3rd generation chassis. Weak motors but workable seeing that they're the only Gen3 bikes that the older ...more

jonahdru222 wrote:

so if i understand correctly, if i find a 2003 and throw an 05-07 cylinder on it and add 10mm to the rear shock clevis then i’ ...more

Swingarm, linkage, shock all different starting in 05

|

2/19/2018 6:54 PM

Can you put an 05 motor in an 04 frame?

|

2/20/2018 11:11 AM

dylanv21 wrote:

Can you put an 05 motor in an 04 frame?

All engines from 93(?) -07 have same motor mounts. Older cases need holes bored out slightly. We ran a '93 bottom end in our '02 for awhile while rebuilding the '02 engine.

Big fan of the '02 with HPP cylinder............can be made to run very strong........

|

2/20/2018 12:16 PM

What year is the best motor? I have an 04 that I am building and the top end is trashed and I was going to replace the crank while I was into it.

But with the electronic power valve, I thought about getting a different year motor to get away from the EPV.

What all would I need if I put a different year motor in my 04 frame?

|

2/20/2018 9:31 PM
Edited Date/Time: 2/20/2018 9:37 PM

I built an 03 two years ago, bike was awesome but not "fast" haha. That was with engine mods, 134cc, 07 airboot/holes in airbox, etc

Ran strong though

|

2/21/2018 5:57 AM
Edited Date/Time: 2/21/2018 5:59 AM

I have an '04 and with the right motor mods they can run fairly strong. Pipe, Cylinder porting work, increased compression ratio, vforce reeds, correct EPV set up and the '07 air boot all help to increase the get up and go of this great handling bike.

However even with all these mods I would still rather spend my money on a newer stock husky or ktm with the amount I've spent making the '04 competitive

|

2/21/2018 7:06 AM

seth505 wrote:

I built an 03 two years ago, bike was awesome but not "fast" haha. That was with engine mods, 134cc, 07 airboot/holes in ...more

That track looks perfect for the small bore two smoker.

|