Posts
104
Joined
4/23/2019
Location
GB
Edited Date/Time
4/28/2020 11:25am
Hi,
Having taken a hiatus from my frustrating CR250 02 build I decided I'd grab a 125 to get me through the year and at least get a little riding in.
Found a super clean, pretty much all original 03 CR125 going locally and grabbed it for a reasonable price. Looks low hours and was cared for. Intention was to just give it a once over, top end and then ride.. the road to hell is however paved with good intentions..
Plan is to rebuild the top as the engine is clean as a whistle, replace all the bearings, rebuild forks and shock and just a general tidy up.
Here's the bike as it was before the work began. I'll post some updates of the work so far later..
Having taken a hiatus from my frustrating CR250 02 build I decided I'd grab a 125 to get me through the year and at least get a little riding in.
Found a super clean, pretty much all original 03 CR125 going locally and grabbed it for a reasonable price. Looks low hours and was cared for. Intention was to just give it a once over, top end and then ride.. the road to hell is however paved with good intentions..
Plan is to rebuild the top as the engine is clean as a whistle, replace all the bearings, rebuild forks and shock and just a general tidy up.
Here's the bike as it was before the work began. I'll post some updates of the work so far later..
Frame is tidy and just in need of a little clean up;
Engine is on the bench but it's always nice to open a couple of the covers and see something nice and clean;
Forks and shock have gone away to be rebuilt.
Head bearings have been regreased and feeling lush.
Only issue at the mo is that I can't get the darn cylinder off the thing. Seems to be frozen onto the dowel pins. Got the heat/lube treatment and tension on the cylinder so fingers crossed it will free up. Patience...
Si
The Shop
Luxon 4-Post Bar Mounts
$189.95 - $239.95
Free shipping: VITALMX
DeCal Works Huge Plastic Inventory of UFO and Polisport kits.
If you need any info, torque specs etc along the way, i have a genuine workshop manual , got a few spare odds and ends also for the 03, if you're anywhere near E/Sussex you're welcome to borrow it if needed.
Thanks for the kind offer. I’ll could defo do with some info as I don’t seem to be able to find the workshop manual online anywhere. Let me know what spare bits you’ve got floating around at some point..
Si
Famous last words!
Lots of OEM parts. Replacement cylinder as the original jug had a small Nikosil flake on the exhaust bridge (I'll get the old one replated and ready to go as a spare). Pivot Works link and swingarm kits. Renthal sprockets.All Balls carb rebuild kit and Specbolt kit. Just waiting for the MX Bonz airbox kit and the piston and we should be getting close.
Finally succumbed and stripped it down to the bare frame. All cleaned and ready to go...
Forks and shock are back so I'll start building this weekend.
Pivot works link bearing kit assembled and head forks installed. All dry run at the mo to make sure we're all good..
It's about now I'm wishing I got the shock spring powder coated but I'll probably be changing it anyway as I'm not quite as light as I used to be!
Si
I do have a decision to make on this however. Intention was to keep it as original as possible but the brake lines are tired and need changing. I'm looking at Venhill braided hoses and the red ones sure look sweet.. not sure whether to grab these instead of black. Tough decisions..
Managed to get all the parts cleaned up this weekend and the workshop tidied up in readyness for building proper. MX Bonz airbox kit is here as is everything else I need other than the break lines. Hopefully from here on in the only way is up!
Engine rebuilt and ready to rock 'n' roll. Will be vapor honed at the end of the year when I rebuild the bottom end so I've just got to live with the fact it's not looking as pretty as I'd like. New cylinder but getting the power valves in a working smoothly was a major PITA
Starting to look like a bike again finally.. waiting for a few bits and I should be on the home straight..
Enjoy;
Pit Row
found a pic of a mxa project bike that has the holes but not the uni filters
Appreciate the post mate.
Si
I'm going to grab another box and pop in the filters for sure.
On the other points from a carb perspective I presume you mean PWK A/S? I purchased on of these some time ago, refurbed it and then went to pop it on only to realise that the 03 has a short carb and my PWK is a 90mm long body - doh!
I'm interested in the PW timing mod? Saw some things Nino had posted on the HPP motors but hadn't seen anything for the later gens? Tell me more
Your bike looks awesome BTW
Si
Yes I was referring to the 38mm Kheihin PWK airstriker, I have the short body with the screw top.
It gives the bike more top-end but suffers in the mid range because of it, which makes you wear out the clutch to keep in on the pipe. That is where the 3mm washer on the powervale helps is in the mid-range, but without the 38mm carb, this upgrade is not needed and probably make things worse.
I am going to add the STIC meter bloc into my carb soon, I believe that may be the only power left to gain without boring the cylinder
Post a reply to: CR125 2003 - I'll just clean it up and grease the bearings build - NOT!!