Question about 2003 Yamaha YZ 125

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What oil should i have in yz 125 2 stroke

I have a yz 125 2001 model what oil should i have in the clutxch and transmition?

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  • RYANDUNDAS1 Apr 20, 2009

    okay thank you
    what is the diffrence between transmition oil and motor oil? where do each oils go?
    what oil should i put in the oil cap on my bike?

    Ryan Dundas


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The clutch and gearbox share the same oil. The oil for the motor is 10w40. Stick with the major brands; Pennzoil, Quaker State, Mobil, Yamalube or Shell.

Posted on Apr 19, 2009

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Alot of the motor oils for cars have additives that if used in mororcycle clutches will cause the clutch to slip. DO NOT USE OIL that is NOT recommended for cars. Maxima, golden spectro, amsoil, Yamalube, are fine....Stay away from the penzoil and such

Posted on May 05, 2009

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I used a car oil in my 2002 CR125R and it was not wet-clutch compatible and my clutch plates stuck together, the clutch was fine, just each plate needed to be cleaned before reinstalling.

Maxima is a great motorcycle oil, they make a special line for 2-strokes called MTL they have 75W, 80W, 85W it's a Great product.

Posted on Jul 28, 2009

  • Linda Edwards
    Linda Edwards May 25, 2015

    Where do I get the maxims oil and how to much do I put in a 2003 yz125 2 stroke


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Apr 20, 2009 | 2003 Yamaha YZ 125

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Best wishes Ryan :)

Apr 19, 2009 | 2003 Yamaha YZ 125

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Nothing significant, don't worry about it. You do NOT want oil marked EC, signifying energy conservation. Such oil will cause the clutch plates to slip and premature clutch wear. If the oil you put in does say EC on the small round type seal simply drain it out and put in the correct oil. Not critical but the sooner the better.

Apr 19, 2009 | 2003 Yamaha YZ 125

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