03 CR 125 rebuild/restore

seth505
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seth505
Story: Buddy/his wife had this CR 125 and it gave them fits. It smoked like crazy and sputtered, they had someone rebuild it, it seemed to run good then smoked like crazy again and got coolant in the motor. She moved to a 250f and they enticed me to buy this thing knowing I like to work on bikes. I bought it with intentions on rebuilding the top end and flipping it for a tiny profit. In reality, I tore the thing down to the frame and rebuilt it from the ground up. This wasn't a "throw 10k at it" build, this was what I'd call a reasonable rebuild but with no corners cut.

The beginning looked like this:



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seth505
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seth505 10/28/2016 5:59pm
10/28/2016 5:59pm Edited Date/Time 11/23/2016 6:55am
Rebuild process is somethin like this:

disassemble everything
clean/polish frame and other components
RG3 20mm offset clamps
Anodized black revalved Showa crf forks (on after pics were taken)
07 airboot/intake
Drilled 3 holes and added inserts on each side of airbox for additional air
Vforce reed valve
Intake ported to match Vforce profile
New Sunstar Sprockets 13/53 and DID ert2 chain
All new OEM Honda transmission bearings/seals
OEM 07 Honda Bottom end
Wossner top-end
Millennium Tech replate 134cc cylinder
new OEM Honda head and Millennium mod head
cylinder exhaust port/exhaust flange port matched
New radiators
New red radiator hoses
New suspension bearings
New Acerbis plastics
Throttle Jockey graphics/plates
2016 front fender/cycra plate
Tag RC bars
Bud Racing/HGS factory pipe and carbon silencer
Bud pegs
DID ltx rims/stock honda hubs










seth505
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seth505 10/28/2016 6:06pm
10/28/2016 6:06pm
Finished up for the most part and she runs! Ran her a few times to start to break in and am probably going to head out to 212land this Sunday to run her hard.








Kx125rider 10/28/2016 6:51pm
10/28/2016 6:51pm
Awesome bike, lots of cool parts. Where did you get the airbox inserts?
seth505
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seth505 10/28/2016 7:13pm
10/28/2016 7:13pm
Kx125rider wrote:
Awesome bike, lots of cool parts. Where did you get the airbox inserts?
Thanks man. Those are made by UniFilter. Sometimes places like rockymtn or BTO stock em. They come with 6 in a pack.

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ledger
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ledger 10/28/2016 7:58pm
10/28/2016 7:58pm
CR 125 number 505 came out look'n great. You should be very pleased.
JM485
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JM485 10/28/2016 8:28pm
10/28/2016 8:28pm
Man, that came out sweet! I'm curious to hear how the 134 is, I have an 04 and a spare cylinder that needs a replate anyways, so I'd like to hear how it stacks up against a regular 125. Love the overall look of the bike as well, not over the top but the little things like the front fender update and stadium plate make a huge difference.

I have a feeling this is going to become a really popular section of the forum.
seth505
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seth505 10/28/2016 9:26pm
10/28/2016 9:26pm
JM485 wrote:
Man, that came out sweet! I'm curious to hear how the 134 is, I have an 04 and a spare cylinder that needs a replate anyways...
Man, that came out sweet! I'm curious to hear how the 134 is, I have an 04 and a spare cylinder that needs a replate anyways, so I'd like to hear how it stacks up against a regular 125. Love the overall look of the bike as well, not over the top but the little things like the front fender update and stadium plate make a huge difference.

I have a feeling this is going to become a really popular section of the forum.
Thanks dude, I had an RM 134 last year and also rode a stock YZ (was stronger than my mod RM) so I'll do my best to compare.
CarlinoJoeVideo
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CarlinoJoeVideo 10/28/2016 10:05pm
10/28/2016 10:05pm
Looks awesome! Those uni filters look awesome!

If you don't mind, roughly what did you get the bike for and how much did you put into it?
seth505
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seth505 10/29/2016 2:26am
10/29/2016 2:26am
CarlinoJoeVideo wrote:
Looks awesome! Those uni filters look awesome! If you don't mind, roughly what did you get the bike for and how much did you put into...
Looks awesome! Those uni filters look awesome!

If you don't mind, roughly what did you get the bike for and how much did you put into it?
I have a spreadsheet with everything I've done and bought but never added it up yet, I'll do that this weekend and let you know.
seth505
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seth505 10/29/2016 8:48am
10/29/2016 8:48am
CarlinoJoeVideo wrote:
Looks awesome! Those uni filters look awesome! If you don't mind, roughly what did you get the bike for and how much did you put into...
Looks awesome! Those uni filters look awesome!

If you don't mind, roughly what did you get the bike for and how much did you put into it?
Hey man, I finally looked (didn't want to haha) but I'm right around $3200 at this point.
CarlinoJoeVideo
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CarlinoJoeVideo 11/1/2016 11:02am
11/1/2016 11:02am
CarlinoJoeVideo wrote:
Looks awesome! Those uni filters look awesome! If you don't mind, roughly what did you get the bike for and how much did you put into...
Looks awesome! Those uni filters look awesome!

If you don't mind, roughly what did you get the bike for and how much did you put into it?
seth505 wrote:
Hey man, I finally looked (didn't want to haha) but I'm right around $3200 at this point.
Is that all in including the bike? That's not bad for basically a brand new bike...
seth505
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seth505 11/1/2016 11:18am
11/1/2016 11:18am
CarlinoJoeVideo wrote:
Is that all in including the bike? That's not bad for basically a brand new bike...
Yup, not too crazy. I just ordered a new shifter and pegs since those were the only worn out items left and I'm considering Showa forks for the fun of it.
seth505
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seth505 11/21/2016 7:18am
11/21/2016 7:18am
Rode the bike for the 2nd time on Saturday and she's goin strong. I have some Showa forks coming tomorrow and that will probably be the last "unneeded" mod for her haha

https://youtu.be/0R7FcVN5toI
H Wright
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H Wright 11/22/2016 10:50pm
11/22/2016 10:50pm
Just finished my 02 cr125. Thing ran like crap and had zero bottom end power and maybe 50% top end. Everyone thought i was an idiot for buying it for 1200 at a honda dealership. But i dumped 2500 into it and its pretty much brand new. All OEM bottom and top end rebuild, boysen rad valve with a special torque spacer i milled, ported the intake and exhaust, pro circut works pipe and 403 shorty, did a little milling in the power valve, 13 tooth renthal countershaft sprocket, 53 tooth renthal sprocket, factory connection suspension rebuild, mtr preformance variable cylinder head, dunlop mx 32 & 42 custom tread. Ran AV gas in it around 100 octane high lead content. Pushing around 44-45 horse when its on the pipe. So for 3700 i got a escensially brand new bike thats super high preformance that can keep up with any 250f out there easily. Gotta love 2 strokes. Especially 125's. So much you can do with them Smile
seth505
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seth505 11/23/2016 6:57am
11/23/2016 6:57am
H Wright wrote:
Just finished my 02 cr125. Thing ran like crap and had zero bottom end power and maybe 50% top end. Everyone thought i was an idiot...
Just finished my 02 cr125. Thing ran like crap and had zero bottom end power and maybe 50% top end. Everyone thought i was an idiot for buying it for 1200 at a honda dealership. But i dumped 2500 into it and its pretty much brand new. All OEM bottom and top end rebuild, boysen rad valve with a special torque spacer i milled, ported the intake and exhaust, pro circut works pipe and 403 shorty, did a little milling in the power valve, 13 tooth renthal countershaft sprocket, 53 tooth renthal sprocket, factory connection suspension rebuild, mtr preformance variable cylinder head, dunlop mx 32 & 42 custom tread. Ran AV gas in it around 100 octane high lead content. Pushing around 44-45 horse when its on the pipe. So for 3700 i got a escensially brand new bike thats super high preformance that can keep up with any 250f out there easily. Gotta love 2 strokes. Especially 125's. So much you can do with them Smile
Too much fun, nice job man.

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