Posts
57
Joined
6/23/2017
Location
NZ
Edited Date/Time
2/17/2018 1:37am
So I just picked up this cr125 2002 for reasonably cheap(I think, need to wait for the tear down to really see if it was cheap lol) but anyway plan on doing a build that I like not what everyone else has. A build that I spend a reasonable amount of money on it to make it super, but then not be afraid to thrash it like a normal dirt bike. I will do as much as I can cosmetically to make it look super but also as much as I can to make it a reliable bike and do things to make it as powerful as possible.
The bike was covered in sand when I picked it up, with a typical answer of why it’s not clean is that he ‘forgot to wash it’. But anyway it has a 140cc kit with apparently only two hours but we will see about that on tear down. I will probably but a new cylinder to change it back to a 125 but then if I did want some extra power I could swap it. It also came with a fmf shorty and a near new rear tyre, and surprisingly straight radiators but that was about it for the pros. So from then on in it was basically all bad, with sand everywhere, front brake locked on, rusted to hell chain, leaking fork seals, no kill switch, bent bars!!, and general roughness. But not to worry it will all be replaced. Also aparently after the 140cc kit was installed it started fouling plugs quite often. This has happened on my other bikes before and it was just the carburetor needed some adjustments.
My plans for the bike so far are:
full engine rebuild
Upgraded suspension (want opinions on best to use)
2017 plastics conversion kit, also comes with new seat
Full pipe system( what’s the best brand for this bike?)
Boyseen or vforce reeds
New bars
New carb
All new tyres
New rim set
Lots of powder coating and anodizing
New chain and sprockets
And much more but that’s just a basic run down.
Basically I am trying to replace as much as I can on the bike, to get something awesome.
Any tips or thoughts on what to do with it are much appreciated.
This build is located in New Zealand
Here are some pics of the bike as is. (When bought) will start tear down over next couple days.
The bike was covered in sand when I picked it up, with a typical answer of why it’s not clean is that he ‘forgot to wash it’. But anyway it has a 140cc kit with apparently only two hours but we will see about that on tear down. I will probably but a new cylinder to change it back to a 125 but then if I did want some extra power I could swap it. It also came with a fmf shorty and a near new rear tyre, and surprisingly straight radiators but that was about it for the pros. So from then on in it was basically all bad, with sand everywhere, front brake locked on, rusted to hell chain, leaking fork seals, no kill switch, bent bars!!, and general roughness. But not to worry it will all be replaced. Also aparently after the 140cc kit was installed it started fouling plugs quite often. This has happened on my other bikes before and it was just the carburetor needed some adjustments.
My plans for the bike so far are:
full engine rebuild
Upgraded suspension (want opinions on best to use)
2017 plastics conversion kit, also comes with new seat
Full pipe system( what’s the best brand for this bike?)
Boyseen or vforce reeds
New bars
New carb
All new tyres
New rim set
Lots of powder coating and anodizing
New chain and sprockets
And much more but that’s just a basic run down.
Basically I am trying to replace as much as I can on the bike, to get something awesome.
Any tips or thoughts on what to do with it are much appreciated.
This build is located in New Zealand
Here are some pics of the bike as is. (When bought) will start tear down over next couple days.
We put a pc pipe and shorty on it along with a vforce 3 reed cage and yetted it. Felt like it did 10+ hp more after that.
Those bikes seem terribly underpowered compared to others. I'd recommend some mild porting and reeds, along with an FMF Fatty or PC pipe, whatever you prefer.
It might benefit from the 140 kit if that's your thing, but I liked mine in stock form.
Spend those money on an air striker carb instead.
Underpowered or not, i ran the same Times and (race)pace with my 06 125 as my 16 250f.. but with a awesome grin on my face
Going wfo on big step ups and barely make it feels amazing on these scoots!
The Shop
2007 air box and air boot. They slightly redesigned them to help air flow.
Boyesen Rad valve and reeds.
PWK airstriker carb conversion is a must. You can purchase the whole carb jetted and everything from JD or purchase the carb separately from Ebay then purchase the jetting kit from JD.
Cryca high-flow rear fender.
I have even seen people drill 1/2 sized holes directly into the air box, like husky did one year on their 250f
Boyesen exhaust flange.
Of course Pipe and silencer. I run FMF fatty pipe with shorty silencer. I have herd some suggest a pipe from a Stock Kawasaki 125, but have no experience myself.
Spend those money on an air striker carb instead.
Underpowered or not, i ran the same Times and (race)pace with my 06 125 as my 16 250f.. but with a awesome grin on my face
Going wfo on big step ups and barely make it feels amazing on these scoots!
I will defiantly be getting an exhaust system, probably pc along with some vforce 3 reeds. And will consider some porting?
What’s the cycra high flow rear fender? Haven’t heard of it before
I will look into those other things u have stated and see if it’s worth the money?
The reason I bought this bike was because I have always loved the frames on them and seen some wicked builds on here! It came up and for the right price so I went ahead. But now I have the bike there seems to be a few people on here basically saying the bike is powerless which kinda worries me?
Will adding this piece alone result in drastic engine response? probably not. Again its a million little things added together that help it breathe more.
Also by looking at the pictures of your bike, it appears the previous owner has closed the intake ports on the side number plates, which doesn't help your case.
To your point asking whether or not some of the items are worth the money, do you consider titanium bolts worth the money? Some do, others don't, but I recall you saying " A build that I spend lots of money on it to make it super"
And to answer the question about the bike being "powerless". In a shootout comparison, yes the bike would probably rank pretty low on power output compared to similar 125s that year, or the current YZ or KTM 125.
But I have ridden my 2002 CR125 then switched to a similar build YZ125, and hands down the CR wins, in power and agility. And like one of the other guys said about having similar lap times on his 250f. Its how you ride it, fast guys go fast, slow guys go slow.
And I’m not sure what u mean about the closed off intake ports as I have never owned a cr before just have always liked them. But I will google another bike and see if I can spot the difference. Thanks again for your reply.
Update! I now see what you were talking about closed off I take ports?
Pit Row
Although I have made some progress, I have been contacting a few companies about parts. And have got together a bit of a price list for them.
Just need some advice from someone,
1: what year forks and what bike from, should I put into this bike? What year and bike will slide straight in?
2: will I need both air box or just the air boot from a 2007 CR125?
3: could someone post a link to a pwk carburetor they have bought from eBay without being scammed?
4: and what do u guys think about possibly powder coating the frame black? I haven’t seen many people do it to crs, so thought it might be a little different than a polished frame?
5: and what’s your guys best cleaning tips? For engine cases, frame, and basically everything on the bike since it’s completely covered with sand and corrosion. ( not looking for to seeing what’s underneath it’s skin)
Cheers codey
2. Just the boot
3. Look for a used one
4. I had my frame polished, Looked good from a far but started getting scratched and looked like shit, I've seen a few done in a works pipe like brushed aluminum finish and really like it
5. Sand blast, Scotchbrite, Simple green
I have found a guy parting a crf 250 who will sell the whole front end, forks (Showa), front wheel, axle, front brake assembly, clamps (ride engineering top clamp) and also the rear wheel. For pretty cheap so i think I’m gonna go with that.
Would there be any advantages using the 2007 air box aswell?
I’m not a fan of the polished look either so I will either get it back to the factory finish or powder coat it, I would like to powder coat but then it is another cost that can sometimes not look great if a bad job has been done. Also they can chip off quite easily. So not sure what to do there.
That will wake the engine up a little
and here is where the CR125 sits now
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