You have to remove the headlight cover, the headlight, and the air intake box off the injector throttle bodies. Takes lots of time but is not real hard if you have the right tools. You will see the oil filter on the front of the engine next to the knock sensor. An oil filter tool from your Yamaha shop is real handy also. A real good article with pictures is here:
http://www.snowmobilefanatics.com/forum/topic/63721-how-to-change-oil-2007-yamaha
50:1
2-Cycle Engine oil.
It should be oil injected with a separate oil resivoir.
in the motor
Just go buy any chaincase oil such as AMSOIL.
no oil filter
yamaha xt 125 doesn't have oil filter.
fram 6017A stp SDF13
where is the oil filter on a 1989 yamaha motto 4
I use a K & N oil filter, model KN-303 (black) or KN-303c (Chrome) on my 2007 Yamaha Stratoliner. They come with a 17mm bolt welded to the top for easy torquing and removal.
yes it has an internal oil filter
Pretty sure 98-2007 takes a Fram CH6004 filter. Type your answer here...