2003 YZ 125: how much crankcase oil does a 1990 yz125 take...

SOURCE: suspension specs for a 2007 yz 125

hi lilsilence, thank you for using fixya. below is a line from dirtrider.com, answered the same question for a 2003 which is the intro for speed sensitive suspension.

Several ways to go here. Remove half of the fluid in each fork and addback a 10wt. This will approximate a 7.5wt. Going to a 10wt. willreduce bottoming but will give you some harshness. Depending on yourweight and riding style it is difficult to give you proper advice, justgeneralities.
I use ATF fluid. I'm valved for wood and light MX, stock springs, and Iweigh 155 lbs. ATF is cheap and is something simular to 7.5wt. I'm noexpert and my explanation might not hold water but it works for me.

Mobil1 Synthetic ATF is a very popular fluid that will probably be the weight you want.

Seems to me that I can make much more difference in the action bychanging the fluid levels. If you mix up riding between track andtrail, you may want to consider sub-tanks.

Draw out half of the fluid with a piece of tubing attached to a saryngeand put back an equal amount of 10wt. Adjust the level from there tosuit your comfort.
Sub-tanks give a greater amount of adjustability and plushness. Pricey but do the trick when properly set up.

http://www.dirtrider.net/forums3/showthread.php?t=159185

I have use close to the same method on my rm250 and have worked for me, i sure hope it will help you out in another way.

if you have other question, please let us know.

regards,

voodoo

SOURCE: what oil should i have in yz 125 2 stroke

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.

SOURCE: oil for yz 125

yes that will work BUT,i have a 03 660 raptor and all i use and recommend is yamahlube.

SOURCE: YZ 125 04 GEARBOX OIL

Should be about 650ml, isnt it stamped on the casing somewhere?

SOURCE: would a front master cylinder off a different bike fit my yz 125?

the only way to tell is to match them up with out knowing exactly what year they both are its hard to tell but the change every couple of years