99 cr125

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6/13/2018 3:34 AM
Edited Date/Time: 6/13/2018 8:08 PM

My 99 125 that was bought blown up. Needed a case welded, new plating, head machined. I just ground up rebuilt everything. Swingarm and linkages were ordinary to say the least. Forks had corroded! so they went in the bin but I planned on putting my 450 front end on. Punch marked the kick-start knuckle and rear brake lever bolt to close up the clearance which has worked but for how long haha. Pretty happy with the whole build as it was a lot of learning ( first bottom end, shock rebuild). Had quite a bit of advice off the fellow Vitard and it all provided a smoother build. Cheers Fellas.

Didn't really care to polish much. Cared more so for internals and weight saving. Also going stealth with just white numbers on side panels and black background on front plate.

Has 139 topend kit from MaxRpm.
Machined down sparkplug seat on head
Hybrid ceramic mains.
ISF box
Cr450 15 front end- saved 1.3kg, soon to be xtrig Rocs 22mm offset clamps off my 450
Yz Ti spring
Yz Ti pegs
bored to 37.5mm keihin pj
Radvalve
Case matched and flowed cases
Drilled clutch basket and hub
05+ crank
Modified PV governor
Various Ti bolts
FMF fatty and unknown brand silencer
Planning on running it at 32-1 on Leaded and I will continue to play with things and grab a vortex CDI soon enough
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6/15/2018 12:11 PM

Cool project, did you use the 450 front wheel and spacers or the 99? Ive got a 95 with 08 forks and I’m getting a spare wheels trying to decide which to use.

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6/15/2018 3:20 PM
Edited Date/Time: 6/15/2018 3:23 PM

99 wheel with 450 axles spacers. Front wheel is the same just spacer and axle changed and i can run my 450 wheels too as they both have 260 discs. Handy

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6/15/2018 4:00 PM

Nice! Im unfamiliar with the modified PV gov. Ill have to look into it. I went with a Keihin 36 from cpw, saving the old pj as a back up. Need to find some 98-99 pv's to help seal the ports better than the 95 pv. Ive read AF motor mounts are bigger than steel frames, otherwise motors are interchangeable,from 92-99? (except for 90-91 with dome pistons)

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6/15/2018 4:03 PM

How does it run so far? The weight should be pretty impressive/low. There are a few tuners on here that say they get a CR125 to run, but all of the ones I've ridden have been pretty anemic. I'm sure those other tuners will add something.

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KTM250SX YZ125 YZ85 PW80 ZX6 FZX700

6/15/2018 4:30 PM
Edited Date/Time: 6/15/2018 4:33 PM

YZed250 wrote:

How does it run so far? The weight should be pretty impressive/low. There are a few tuners on here that say they get a CR125 to run, but all of the ones I've ridden have been pretty anemic. I'm sure those other tuners will add something.

Don't know. Didn't have time as im transiting in Taipei on my way to Italy. Bummer as I'm so keen to run it in and try it. They were pretty light those alloy frames, just picking it up when stripped it was noticeably lighter. I have saved 3kg on so far easily and cheaply.
If I was to do it again I'd get a long rod after much reading 125's want 110mm+
I'd you ever get the time lookup kiwibiker forum and the bucket racing section... You'll learn everything possible as far as two strokes got to development wise. Only like a 1000 pages to read but trust me if you're into tuning them.

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6/15/2018 4:36 PM

Mx746 wrote:

Nice! Im unfamiliar with the modified PV gov. Ill have to look into it. I went with a Keihin 36 from cpw, saving the old pj as a back up. Need to find some 98-99 pv's to help seal the ports better than the 95 pv. Ive read AF motor mounts are bigger than steel frames, otherwise motors are interchangeable,from 92-99? (except for 90-91 with dome pistons)

Learnt it off Nino the fella with the mugen cr125's. You pull the spring off the governor and preload it with some shims. Delays opening of the power valve a few hundred rpm and he reckons it helps. He said the HRC guys had different springs like Ktms setup.

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