kdx n kmx 125

[2strokestroke...]

Hi I'm restomoding both a Kdx125 n Kmx 125 we kKdxmore enduro n kmx supermoto n need info,1 what yr kx is Kdx based on? Its 92 model we rwu forks (for now), do I need a press to replace main bearings? What yr kx USD forks fit if any? Pref 250 forks coz I'm heavy,will a Kdx 200 top end go on or is they a kx barrel that will? Know about ring intervals n stuff if do this, is rear shock re buildable or what kx in will go? Kx exhaust? I know could buy kx but wanted a Kdx when new n had prob 5 kmxs so.... Anyone with a kmx200 barrel n head?pref knackered coz be wantin put steel sleeve in anyway n got couple kmx 125 top ends to trade if helps 1 nikasil original n 1 we steel sleeve, I'm derbys , same if anyone got suitable front ends etc? No silly prices

[weasley]

The KDX125 barrel is unique to the KDX as it does not have a mount for the carb, since this is mounted on the crankcase. All the others mount the carb on the barrel. KDX barrels are tough to find (I had to find two!).

Mine had a USD fork (with two piston brake caliper) which I never identified, although I believe it was a KDX 200 front end. Dangerousdave on here knows his stuff on these things.
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Yamaha XJ600 | Yamaha YZF600R Thundercat | KTM 990 SMT | BMW F900XR TE

[stevo as b4]

Good luck getting any KMX200 top end parts for non silly prices. if anyone does have them I doubt they will let them go now if they might need them, and often they are not cheap. It's looking like getting a complete bike is the best way to get your hands on a motor or just parts from it.

The KDX125 I think was based on the 88-89 KX125. The cylinder from the KX might well go onto the cases, but you will need to research this yourself and look up parts numbers etc. It's worth comparing gaskets from KDX and KX's on parts diagrams to see what is common or looks the same. The trouble is finding a decent used 88/89 KX125 cylinder will be harder than even KMX200 bits. I don't think the barrel alone will help you much, as for it to run well you'd need the KX head, Carb, exhaust and probably the ignition or at least the correct advance curve to suit. You definitely won't find a decent KX125 pipe knocking about unless you are prepared to buy new or custom made.

Id personally either forget trying to combine KX and KDX parts and just tune the KDX engine if you want to, or try and fit a KDX200SR engine into the chassis instead.

[weasley]

I looked at KX barrels when trying to find a KDX one. As I said, the KX has the carb on the barrel so is totally different. You may be able to make it work, but it's not a bolt-on solution.

I may even have a couple of wrecked KDX barrels somewhere, but they will need sleeves.
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Yamaha XJ600 | Yamaha YZF600R Thundercat | KTM 990 SMT | BMW F900XR TE

[2strokestroke...]

Thanks on offer of Kdx barrel iv got 1 we steel sleeve in but yea... Thanks I'll bear in mind, a USD front end s what also need?? Really appreciate reply tho

[stevo as b4]

88> KX125's and all KDX125's use a crank case reed inlet set up. It's the KMX125/200 and KDX200/220/250 that have cylinder mounted reed induction system.

Id say unless your lucky you would need to modify a KDX125 head or use a KX125 head to fit a KX125 cylinder and piston. You must use the correct piston for the model as all the cut outs and windows will be different between KDX and KX models.

I'm not sure what the inlet manifold and reed block looks like on the KDX125's being case reed KX derived engines, but with the KMX/KDX200/220 all the reed blocks from each model fit the other's as do the manifolds allowing you to fit different size carbs etc.[/list]

[dangerousdave]