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tctrailrider

BK mod jetting?

7 posts in this topic

Thanks to all the great information on this site I just completed the BK mod on my 2000 WR400. Just got the WR a fiew months ago, got a great deal and decided to try the 4 stroke. I ride in northern Michigan with my 14 yr old son, exclusively single track. My previous bike was a CR250 and I have allways felt 2 stroke was the way to go. 4 strokes rule, the more I ride it the better I like it, smooth and totally maintenance free. My only complaint with the bike is that is sluggish in the middle, to wheelie over the whoops I have to open the throttle all the way. Hopefully the BK mod will correct this. The jetting is 170 main,OBDRS jet needle on 3rd clip and 42 pilot, pilot screw 1 1/2. I ride at approx. 800 feet. Thanks for all the great info on this site. I feel pretty confident working on 2 strokes, looked at the WR carb and was very intimidated, stuff all over the place. TT site had all the information to get me up to speed.

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I also had weak middle until I changed to YZ's EJP needle. Now I'm wheeling in 5th.

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No it is WR timed. Have thought about YZ timing but holding off for now. Will YZ timing create reliability issues that I don't have now?

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Called the local Yamaha dealer and they can't find part # for the OBEKN needle, what bike and year would they need to search to find it? Or how would I find one.

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