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1974 YZ 125 info/ parts


1975 Yz 125
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I just picked up a complete 1974 YZ 125, for $300, and it runs!

Its in Pretty Good Shape, most all parts useable.

Im having a hard time finding info on it, and parts.

I need a gasket kit, and so far only bike bandit sells gaskets, and their individual (around $5-$10 EACH) which will get expensive real quick.

I would like to find just pictures, so far ive only found a red/silver one, and mine is yellow.

Any help would be much appreciated.

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I just picked up a complete 1974 YZ 125, for $300, and it runs!

Its in Pretty Good Shape, most all parts useable.

Im having a hard time finding info on it, and parts.

I need a gasket kit, and so far only bike bandit sells gaskets, and their individual (around $5-$10 EACH) which will get expensive real quick.

I would like to find just pictures, so far ive only found a red/silver one, and mine is yellow.

Any help would be much appreciated.

I konw your the wrong side of the atlantic for these guys but TY trials spcialise in 70's and 80's off road, dirt and trail bikes. As far as i know they post worldwide and are quite happy to rabbit on over the phone about your problems.

Try their website,

If they can't help i would expect him to know someone who can.

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I got some more info, turns out its a 1974 or 1975 MX 125 not yz, i got her started, blows some smoke though.

I need to replace the gear oil, does anyone know what to put in there?

My manual hasnt arrived yet.

Regular engine oil, some will say it needs to be specific motorcycle oil some will say cheap and cheerfull. I know what i use in my bikes but i'm not fanning the flames of that particular topic.

As far as it goes any std 10/40 engine oil will be fine.

Without wanting to confuse things further the MX's didnt start till 78, if you pop the first 4 or 5 characters of the chasis number up we can say for sure.

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Regular engine oil, some will say it needs to be specific motorcycle oil some will say cheap and cheerfull. I know what i use in my bikes but i'm not fanning the flames of that particular topic.

As far as it goes any std 10/40 engine oil will be fine.

Without wanting to confuse things further the MX's didnt start till 78, if you pop the first 4 or 5 characters of the chasis number up we can say for sure.

Its an MX125 not a DT125MX 1974, model code 402 I think

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Its an MX125 not a DT125MX 1974, model code 402 I think

Thats a new one on me, is it a US only jobbie then?

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