Please Help a Newb

Hello all! I have been riding my X for years and it's as stock as the day I bought it. Now I'm looking for ideas. I'm finally pulling the trigger on mods! Use my X for commuting through the city 80 miles round trip to work. Rippin Back road twisties when I can.

What I've purchased this week.
K&N air filter
Renthal sprockets and chain 13/42

What's been on my mind for purchasing and mods...yet need HELP...
Yoshimura RS4
FMF programmer or Yosh pim2??? What map works best with this set up?
Airbox mod.
Ais mod.
Fender eliminator.

Please help! After looking at this blog for a week straight I'm overwhelmed with so many different ideas.

Thanks for the Help!

What I did to my 2008 WR-250X:

*FMF Q4 muffler and Megabomb header.

*FMF Power Programmer (the map it came with worked just fine).

*Geared the bike down considerably - I went with 13/49 sprockets which seemed perfect for the bike and still allowed for an 80mph top speed.
The bike is overgeared as it comes stock, and personally, I feel expecting a 250cc single-cylindered street bike to turn low RPM while doing 80mph is simply geared too tall for acceleration.

*Removed the airbox flapper (plug the throttle body nipple).

*Removed AIS parts.

*Stayed with an oiled foam air filter (service it often - don't neglect it).

The bike felt and performed very well.

If I had to recommend any other mods, it's that you get the rear shock serviced by a suspension shop that KNOWS this model bike.
The rear shock is a penny-pincher by the Yamaha factory, and reportedly comes with air mixed with the shock oil straight off the showroom floor.

I would immediately return the 42 tooth sprocket and get something bigger. I love my 48.
Of course then you'd probably want/need a speedo correction device.
Would definitely need a longer chain too.

Why not look into a PCV?

You can do the AIS and Flapper mod, and airbox mod, but if you want best performance that's super easy to do and easy to undo, just remove the airbox door.

Most Yosh exhausts are LOUD.
There's little info on this forum regarding the PIM2 doohickies.

FmF type programmers are fine, but limiting as to how much you can do with them.


In the end, what you're asking is kinda like what's the best beer. You'll get different answers from different people.

I absolutely hated the stock gearing.

Oh....and don't start duplicate threads please.