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Yamaha WR426 -01
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Posted by: Thyruz---------------------
Hi. My 2-stroker time is over..I have just bought my first 4-stroker and im somewhat lost...
I dont know anything about 4-strokes and how to tune things up. So here are some questions that i like to get answered plase 
*What "hop-ups" can i do exept for a new "slip on" or silencer? I have heard something about cam shaft angle or something...
*Are there anything special i should take extra care of or are they "unbrakable" 
(Yamaha wr426)?
*Do i have to use expencive fully cynthetic oil or can i use semi/non synthetic oil?
*Maby someone can put up some links that i might can get info on yamaha 426?
Well...thats some of the questions i hope u can enlight me regarding this hm...wonderfull machine?
Thank you
//Thyruz
Posted by: Senior KX Rider---------------------
moved
Posted by: CAL---------------------
Yank the airbox lid off, install a YZ250F needle, pull the cork out of the muffler, and rejet(can't remember what size jets).
Check out the WR forum at www.thumpertalk.com
Posted by: Thyruz---------------------
Airbox lid off! Muffler replaced with YZ426 Muffler! Rejetting...ill check that out...
Thank you for the tips
//Thyruz
Posted by: wayneo426---------------------
Ive had some pretty good results with this jetting:
168Main, OBELN Needle, (YZ250F), 48pilot and 100 pilot air. Big difference from stock,
and it really woke up the motor.
Posted by: galant2nr---------------------
Don't forget to cut down your throttle stop to YZ specs, or just go buy the YZ screw. My dealer did this before I even got the bike. The factory screw only allows the throttle to open 75-80%.
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