Building A KMX 125 - Help, Advice, Suggestions

[Zedxfarin]

Just got my hand on an old Kmx 125,


I'm Gonig to restore it as best i can for use off road,

https://file048b.bebo.com/14/large/2009/03/18/21/593920782a10376527943l.jpg
Bike is striped right now.

https://file048b.bebo.com/14/large/2009/03/18/21/593920782a10376528093l.jpg
Theres no clocks or key, theres also no battery but i do have a headlight.

https://file048b.bebo.com/14/large/2009/03/18/21/593920782a10376528254l.jpg
There is an old DEP Exhaust but is but theres a hole in the side and the end of it is missing.

https://file048b.bebo.com/14/large/2009/03/18/21/593920782a10376528608l.jpg
The Oil Mixer is not wired right now



Stage One - The Piston
I had the piston & barrel down to the shop today for a rebore , Turns out that the dam things nickal plated i have to get a new nickal sheald and piston. £260


Stage One - Clocks - £30
The clocks arived today everything seems to be in order, But the barrel and pistons are still at the shop so no way of testing.

https://i14.ebayimg.com/08/i/001/14/5e/4290_1.JPG

Stage Two - Rebuild Barrel and Piston
So i finaly got the Piston and barrel back from the shop. The finish is realy good and the piston is bran new. I simply have to rebuild it, Will let you all know how i get on.

https://file048b.bebo.com/10/large/2009/04/17/14/593920782a10624060994l.jpg
This is the old Piston its realy in a sorry state.

https://file048b.bebo.com/10/large/2009/04/17/14/593920782a10624060913l.jpg
This is the new Piston and a new set of rings. SHINY

https://file048b.bebo.com/10/large/2009/04/17/14/593920782a10624060701l.jpghttps://file048b.bebo.com/10/large/2009/04/17/14/593920782a10624060772l.jpg
This is images of the refurbished barrel. New nickal plate

https://file048b.bebo.com/10/large/2009/04/17/14/593920782a10624060844l.jpg
I also got a complete new Gaskit set for good measure.
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Montesa Cota 350cc, Yamaha DTr 125cc, Yamaha Timberwolf 250cc, Yamaha YZ 250cc, Kawaski kmx 125cc, Kawaski kmx 200cc, Yamaha TY80cc, 175cc Chinese Dirt Bike, Chinese Wanyge 125cc, Mini & Midi Moto 50cc - What i have owned.

[Gazdaman]

I've got a KX125, not sure how similar they are.

The hole in the side of the can is where the end plug bit is usually rivetted. AFAIK.

Look out on eBay for a new top end if you don't wanna get a replated barrel.

Gaz

[bleddyn123]

your oil mixer/pump is probably disconnected because its been run on premix


bledd

[ben350]

Make sure you do a post over in the show and tell section

Personally I'd go for a standard-ish rebuild with anything like tuning later when she's up and running ok. Other stuff I'd do is junk any road gear thats not needed like passenger pegs / rack / mirrors etc to help lighten up the old girl a bit
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Ducati 996 Biposto
Suzuki Goose 350
DT125R Supermoto (Project)

[Zedxfarin]

So its probly best for me to just mix the oil myself but at wot ratio?
Baring in mined i just reboard the barrel and fited a new piston.
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Montesa Cota 350cc, Yamaha DTr 125cc, Yamaha Timberwolf 250cc, Yamaha YZ 250cc, Kawaski kmx 125cc, Kawaski kmx 200cc, Yamaha TY80cc, 175cc Chinese Dirt Bike, Chinese Wanyge 125cc, Mini & Midi Moto 50cc - What i have owned.

[_sketch_]

I have just finished rebuilding my KMX 200 - Ratio i use is 40:1 seems ok

Just got to finsih the rest of the bike now.

Are you planning to tidy the bike up? i found that finding the parts was hard.


https://img.auctiva.com/imgdata/1/1/4/3/2/8/0/webimg/257257259_o.jpg
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A sucker for 2 strokes
Cagiva Supermoto project

[Zedxfarin]

Disaster

Spark is geting realy week:evil:
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Montesa Cota 350cc, Yamaha DTr 125cc, Yamaha Timberwolf 250cc, Yamaha YZ 250cc, Kawaski kmx 125cc, Kawaski kmx 200cc, Yamaha TY80cc, 175cc Chinese Dirt Bike, Chinese Wanyge 125cc, Mini & Midi Moto 50cc - What i have owned.

[Gazdaman]

That can't be too hard to diagnose.

Start at the kill switch.

Then start at the plug cap, make sure it's pressed on ok. Check the HT lead is into the plug cap ok, then check the HT lead is into the coil ok.

Then check the connections to the coil, and make sure the body of it is earthed ok.

If it's none of those you'll have to start looking at the pickup on the engine.

Gaz

[Zedxfarin]

The bikes not got a kill switch or a ignition key switch, I tryed replacing the Ignition coil and the spark plug but its still not working. I'm realy upset about this. i no nuthing about electrics
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Montesa Cota 350cc, Yamaha DTr 125cc, Yamaha Timberwolf 250cc, Yamaha YZ 250cc, Kawaski kmx 125cc, Kawaski kmx 200cc, Yamaha TY80cc, 175cc Chinese Dirt Bike, Chinese Wanyge 125cc, Mini & Midi Moto 50cc - What i have owned.

[_sketch_]

Have you got a workshop manual? i have one if you want me to photo copy a few pages?
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A sucker for 2 strokes
Cagiva Supermoto project

[Zedxfarin]

Yes i have the workshop book, I got the CDI Unit, Voltage Regulator, Igniton coil & Magneto. Not had a chance to put it all together.
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Montesa Cota 350cc, Yamaha DTr 125cc, Yamaha Timberwolf 250cc, Yamaha YZ 250cc, Kawaski kmx 125cc, Kawaski kmx 200cc, Yamaha TY80cc, 175cc Chinese Dirt Bike, Chinese Wanyge 125cc, Mini & Midi Moto 50cc - What i have owned.

[_sketch_]

Zedxfarin if you are interested i am willing to sell my project KMX 200 off road, its complete with freshly painted frame (black) with everything.

god loads of spares too (including air box, frame, yokes, swing arm, rear shock throttle assy + more

All it needs to get it running is a weld on the engine case (i have good pictures)

if your interested let me know - only reason i am selling is because i want a gasgas or Beta.

Here is a pic of it partly built but got everything ready to bolt on.

Thanks
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A sucker for 2 strokes
Cagiva Supermoto project

[Zedxfarin]

Bit of an update on the old KMX. Well its running again. All it needs now is cosmetic work and its up for sale. Pictures soon.

What i would have dun difrent:

Wish i had time to fit the new electrics i got.

DEFO wish i got a new barrel and not forked out for the nikal plate.

Wish i could have fitted a battery, Ran out of buget.

Apart from that it was a gr8 project. Im now working on a 1995 Yammah YZ250. Keep a lookout for the upcoming post from ZEDXFARIN

Thanks for viewing.....
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Montesa Cota 350cc, Yamaha DTr 125cc, Yamaha Timberwolf 250cc, Yamaha YZ 250cc, Kawaski kmx 125cc, Kawaski kmx 200cc, Yamaha TY80cc, 175cc Chinese Dirt Bike, Chinese Wanyge 125cc, Mini & Midi Moto 50cc - What i have owned.

[GREEN KMX]

I am up to the same thing.
looking for a barrel too!
Checking ebay every day.
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she's alive!!!!

[yvaiwhy]

keep em coming man good luck on your resurrections
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Don't break the speed limit, Just multiply it by 10 times and you will be fine

[mikemyk]

KMX rocks! yeah, you can have it resleeved. I had mine resleeved at a machine shop and used a yamaha DT piston in it. I had to put in thicker gaskets because the piston for yamaha DT is longer, the piston will hit the top end with the thinner gasket.