what do i need to change and when???

[will-NOOB]

my bike is a 2001 yz 125 2001 i have had it about a month the bike is 100% stock it hasnt even ever had a piston change which i am planning because i have been riding it alot recently and i have noticed it is feeling a little less powerfull can anyone give me tips on what to change on my bike to make it have a little more oomph perhaps somone can recomend some parts that will improve things anything will help ohh and one last thing i have run out of proper air filter oil so i used a bit of 3 in 1 i am wondering is this oil to thin cos it is nowhere near as thick as the other stufff that was on it before

 

[Senior KX Rider]

I would not run the bike with something like 3in1 on the filter. Go to a dealer and get the real thing, the No-Toil system works well for me.

 

[JasonWho]

Please run, don't walk, to your local dealer and get real foam air filter oil.

 

[matt-itude]

A good pipe is usually the best place to start for performance. And please dont ride the bike without a real filter oil on the filter. Also be carefull some penetrating oils and such have chemicals which could cause the glue to come undone on your filter or posibly even the foam. Wash it out good to so the filter oil isnt thinned or wont adhere to the foam.