What is BK mod??

Just wondering what this mod is?

Thanks WRooster!! Do all of these tips on the faq work for the wr426 as well??

Thanks WRooster!! Do all of these tips on the faq work for the wr426 as well??

yes, 99% of what is in the 250F FAQ is directly applicable to the YZF/WRF 400/426/450 as well.

since you seem new to the yamaha four strokes, here are some things that i'd read up on ASAP:

PDF versions of the owners manuals:

http://www.thumperfaq.com/oemmanuals.htm

must-do tweaks:

http://www.thumperfaq.com/chain_slider.htm

http://www.thumperfaq.com/ap.htm

http://www.thumperfaq.com/ap_mods.htm

http://www.thumperfaq.com/autodecomp.htm

basic maintenance:

http://www.thumperfaq.com/oil_change.htm

http://www.thumperfaq.com/jetting.htm

http://www.thumperfaq.com/clean_carb.htm

http://www.thumperfaq.com/fork_seals.htm

greasing stuff up:

http://www.thumperfaq.com/swingarm.htm

http://www.thumperfaq.com/steering.htm

http://www.thumperfaq.com/wheel_bearings.htm

and very important, checking valve clearances:

http://www.thumperfaq.com/valves.htm

have fun

jim aka the wrooster

'01 wr250f

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