Yamaha WR426 -01

[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

 

[Senior KX Rider]

moved

 

[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

 

 

[Thyruz]

Airbox lid off! Muffler replaced with YZ426 Muffler! Rejetting...ill check that out...
Thank you for the tips
//Thyruz

 

[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.

 

[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%.