What's Hot Setup to Make 07 CR125 Rock

traatz238
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traatz238
Edited Date/Time 6/28/2017 8:12am
Just picked the Boy up a 07 CR125 . Just looking for some insight to what makes them run strong I've read a few things like mill head and two base gaskets gonna try it . Thanks in advance for some help
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Hondas4Life3
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Hondas4Life3 5/1/2017 9:34pm
5/1/2017 9:34pm Edited Date/Time 5/1/2017 9:47pm
PWK carb swap, V-force reeds, FMF pipe, porting, you can add compression by getting the head milled or buy a VHM head. They are notorious for having airbox leaks so seal it using black weather strip adhesive or MX BONS makes a seal kit. I have one on my bike they are nice.. The stock carb can be jetted as well but a PWK swap is what I would do. The 125's benefit from airbox vents for more flow. A shorty silencer will give it more snap and add on bottom a longer silencer will add on top.
pete24
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pete24 5/2/2017 6:16am
5/2/2017 6:16am Edited Date/Time 5/2/2017 6:17am
sell it and buy a yz 125, go ahead call me an asshole, you will eventually put loads of cash in that thing and then ride someones clapped out yz, and you will kick yourself in the ass hard!
1
Tracktor
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Tracktor 5/2/2017 9:10am
5/2/2017 9:10am
pete24 wrote:
sell it and buy a yz 125, go ahead call me an asshole, you will eventually put loads of cash in that thing and then ride...
sell it and buy a yz 125, go ahead call me an asshole, you will eventually put loads of cash in that thing and then ride someones clapped out yz, and you will kick yourself in the ass hard!
Huh, we have had multiple YZ riders prefer our '02 CR? Only have about $2k into it including bike. Must be doing something wrong better go buy a YZ..........
traatz238
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traatz238 5/2/2017 10:07am
5/2/2017 10:07am
Hondas4Life3 wrote:
PWK carb swap, V-force reeds, FMF pipe, porting, you can add compression by getting the head milled or buy a VHM head. They are notorious for...
PWK carb swap, V-force reeds, FMF pipe, porting, you can add compression by getting the head milled or buy a VHM head. They are notorious for having airbox leaks so seal it using black weather strip adhesive or MX BONS makes a seal kit. I have one on my bike they are nice.. The stock carb can be jetted as well but a PWK swap is what I would do. The 125's benefit from airbox vents for more flow. A shorty silencer will give it more snap and add on bottom a longer silencer will add on top.
Thank You Ill let you know how it goes on the Stuff I have some stuff coming ..

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ehr400
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ehr400 5/2/2017 11:08am
5/2/2017 11:08am
Call Derek Harris HP Performance, he has some good stuff he does to them.
FGR01
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FGR01 5/2/2017 12:34pm
5/2/2017 12:34pm
pete24 wrote:
sell it and buy a yz 125, go ahead call me an asshole, you will eventually put loads of cash in that thing and then ride...
sell it and buy a yz 125, go ahead call me an asshole, you will eventually put loads of cash in that thing and then ride someones clapped out yz, and you will kick yourself in the ass hard!
Tracktor wrote:
Huh, we have had multiple YZ riders prefer our '02 CR? Only have about $2k into it including bike. Must be doing something wrong better go...
Huh, we have had multiple YZ riders prefer our '02 CR? Only have about $2k into it including bike. Must be doing something wrong better go buy a YZ..........
Your 02 has an earlier HPP engine, right? Big difference from the stock 02-07 engines.

I rode a 2005 CR125 that was bored to 134 and had basically no expense spared on motor work. It had about the same top end power as my stock YZ but not nearly as much bottom. But I do prefer the handling of the CR. The YZ is not the best turning machine.
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tornliverluke 5/2/2017 12:36pm
5/2/2017 12:36pm
JD Jet kit, V-Force reeds, Good pipe to go with a shorty and then a little exhaust porting will go along ways on one of these bikes.
Tracktor
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Tracktor 5/2/2017 2:00pm
5/2/2017 2:00pm
FGR01 wrote:
Your 02 has an earlier HPP engine, right? Big difference from the stock 02-07 engines. I rode a 2005 CR125 that was bored to 134 and...
Your 02 has an earlier HPP engine, right? Big difference from the stock 02-07 engines.

I rode a 2005 CR125 that was bored to 134 and had basically no expense spared on motor work. It had about the same top end power as my stock YZ but not nearly as much bottom. But I do prefer the handling of the CR. The YZ is not the best turning machine.
Yes, currently running a '96 HPP top end. Have a stock bore & a 144
38 PWK carb
05+ intake boot
Boyesen reeds
03 KX125 OEM pipe
Pro Circuit shorty silencer
A few other things but that's the quick list motor-wise. SIn't as electric smooth as the newer KTM/HSKY but rode back to back it Z didn't feel he is lacking power wise and the results have shown it. I offered to buy him a new Husky but he declined as he has fun putting it to the newer YZ/KTM's. It's being retired to a play/ special race bike............
mattyhamz2 5/2/2017 2:07pm
5/2/2017 2:07pm
FGR01 wrote:
Your 02 has an earlier HPP engine, right? Big difference from the stock 02-07 engines. I rode a 2005 CR125 that was bored to 134 and...
Your 02 has an earlier HPP engine, right? Big difference from the stock 02-07 engines.

I rode a 2005 CR125 that was bored to 134 and had basically no expense spared on motor work. It had about the same top end power as my stock YZ but not nearly as much bottom. But I do prefer the handling of the CR. The YZ is not the best turning machine.
Tracktor wrote:
Yes, currently running a '96 HPP top end. Have a stock bore & a 144 38 PWK carb 05+ intake boot Boyesen reeds 03 KX125 OEM...
Yes, currently running a '96 HPP top end. Have a stock bore & a 144
38 PWK carb
05+ intake boot
Boyesen reeds
03 KX125 OEM pipe
Pro Circuit shorty silencer
A few other things but that's the quick list motor-wise. SIn't as electric smooth as the newer KTM/HSKY but rode back to back it Z didn't feel he is lacking power wise and the results have shown it. I offered to buy him a new Husky but he declined as he has fun putting it to the newer YZ/KTM's. It's being retired to a play/ special race bike............
Why a kx125 pipe? Just curious
Tracktor
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Tracktor 5/2/2017 3:47pm
5/2/2017 3:47pm
mattyhamz2 wrote:
Why a kx125 pipe? Just curious
It worked better than any other pipe we tried. We didn't try them all but works well enough I can't imagine anything else is worlds better...........
BobPA
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BobPA 5/2/2017 6:10pm
5/2/2017 6:10pm
mattyhamz2 wrote:
Why a kx125 pipe? Just curious
Tracktor wrote:
It worked better than any other pipe we tried. We didn't try them all but works well enough I can't imagine anything else is worlds better...........
I've got an '03 KX pipe if you're looking for a spare
Tracktor
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Tracktor 5/3/2017 11:27am
5/3/2017 11:27am Edited Date/Time 5/3/2017 11:28am
BobPA wrote:
I've got an '03 KX pipe if you're looking for a spare
Always if the price is right? Let me know what you want shipped to Vancouver, WA 98665. Don't "need" but even if I don't I know a couple people who might if the price is right.........What's interesting is the 03 KX looks a lot like a 96 era Bills in shape except it has a longer stinger. It has a fat expansion chamber.............
NoMuff2Tuff
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NoMuff2Tuff 6/28/2017 5:21am
6/28/2017 5:21am
That's cool to know about the KX pipe, I have a stock one from my 03 KX laying around I could try it on my 07 CR 125. I bleed CR red and my take on the 00-07 HPP CR 125's is stock they are mid range ONLY motors, they have no bottom end or over rev what so ever. The 05-07's are better once you get the jetting sorted out with the Mikuni. My 00 stock was slower then a herd of turtles and regretted not getting a YZ. No matter what it will take work to the 05-07 CR to run with a stock YZ, in my opinion the YZ is just a stronger running motor. My current set up on my 07 CR 125 is V force cage, re-worked head, some work done to the intake boot to help straighten the air flow, stock pipe, (hard to beat the stock pipe) PWK carb and the bike runs damn good, as strong or stronger then a 05 YZ I ride sometimes. I just put in a STIC metering block and the bike gained a good bit of top end and over rev but the jetting is more confused in the mid range. I had to go from a 182 main to a 198 to richen up WOT, that's how lean the STIC metering block made the bike run and it now needs some race fuel. Fixing to make a needle change in hoping to crisp n up the mid range.
Frodad78
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Frodad78 6/28/2017 5:34am
6/28/2017 5:34am
I've got a PWK for that bike that I took off my 01CR before I sold it. 100 bucks and its yours, I'm tired of looking at it and spent way too much rebuilding it. Totally refurbed.
traatz238
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traatz238 6/28/2017 7:13am
6/28/2017 7:13am
Frodad78 wrote:
I've got a PWK for that bike that I took off my 01CR before I sold it. 100 bucks and its yours, I'm tired of looking...
I've got a PWK for that bike that I took off my 01CR before I sold it. 100 bucks and its yours, I'm tired of looking at it and spent way too much rebuilding it. Totally refurbed.
I would be interested is that a 36o r 38 and can you send me some pics
Frodad78
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Frodad78 6/28/2017 8:02am
6/28/2017 8:02am
Its a 36, I'll snap a few when I get home and send em your way.
Frodad78
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Frodad78 6/28/2017 8:08am
6/28/2017 8:08am
So I had some on my computer at work lol.

Originally from a 99KX125. It has a port for a TPS or powerjet that was epoxied shut by LCS racing. This is the common way to do it apparently. New bowl and all internals replaced, new choke. All kinds of parts that I spent too much on because I hated the TMX so much. Now I'd just like to see it go to someone who can use it.











traatz238
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traatz238 6/28/2017 8:09am
6/28/2017 8:09am
Frodad78 wrote:
I've got a PWK for that bike that I took off my 01CR before I sold it. 100 bucks and its yours, I'm tired of looking...
I've got a PWK for that bike that I took off my 01CR before I sold it. 100 bucks and its yours, I'm tired of looking at it and spent way too much rebuilding it. Totally refurbed.
traatz238 wrote:
I would be interested is that a 36o r 38 and can you send me some pics
Ok senthem to my email.traatz238@gmail.com would be Awesome Thanks

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Frodad78
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Frodad78 6/28/2017 8:11am
6/28/2017 8:11am Edited Date/Time 6/28/2017 8:13am
Frodad78 wrote:
I've got a PWK for that bike that I took off my 01CR before I sold it. 100 bucks and its yours, I'm tired of looking...
I've got a PWK for that bike that I took off my 01CR before I sold it. 100 bucks and its yours, I'm tired of looking at it and spent way too much rebuilding it. Totally refurbed.
traatz238 wrote:
I would be interested is that a 36o r 38 and can you send me some pics
traatz238 wrote:
Ok senthem to my email.traatz238@gmail.com would be Awesome Thanks
see above

email me at djbrocav@gmail.com with any questions.
traatz238
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traatz238 6/28/2017 8:15am
6/28/2017 8:15am
Frodad78 wrote:
I've got a PWK for that bike that I took off my 01CR before I sold it. 100 bucks and its yours, I'm tired of looking...
I've got a PWK for that bike that I took off my 01CR before I sold it. 100 bucks and its yours, I'm tired of looking at it and spent way too much rebuilding it. Totally refurbed.
traatz238 wrote:
I would be interested is that a 36o r 38 and can you send me some pics
traatz238 wrote:
Ok senthem to my email.traatz238@gmail.com would be Awesome Thanks
So its all setup and ready to Rock for the 07 to ??
Frodad78
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Frodad78 6/28/2017 8:27am
6/28/2017 8:27am
traatz238 wrote:
I would be interested is that a 36o r 38 and can you send me some pics
traatz238 wrote:
Ok senthem to my email.traatz238@gmail.com would be Awesome Thanks
traatz238 wrote:
So its all setup and ready to Rock for the 07 to ??
I had an 01. I know those motors got better as time when on but from what I understand its the same motor. I see you are in Michigan so the jetting may be a little rich for you.

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