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YZ/WR 400, 426, 250F hiccup cure!
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Posted by: blackhawk468---------------------
I am selling my bike and recently have been riding a buddies yz 426. The other day we took it to Performace Factory who did this carb mod. Before there was a hiccup or hesitation on the bottem end of the bike, and this mod compelety cured this. I couldn't believe how much of a difference it made. Anyhow, just thought you yz/wr 4 stroke owners might want to know this. It's a really inexpensive mod, if you want to know contact information e-mail me at blackhawk468@hotmail.com
I hope this is okay to put in here?
Posted by: biglou---------------------
Of course it's OK! 
I believe the mod that was performed is known as the "BK Mod". (BK being the initals of Tim Ferry's mechanic, who invented the mod, I think) It is a very quick and effective mod.
If you get a 4-stroke, you're gonna have to change your sig line from "BRAAAAAP!" to "BUURRRRRP!" :D
Posted by: wayneo426---------------------
Yes, the BK works wonders. :D It cured my bottom end hiccups.
Uh-oh, I feel a quote coming on...... 
Posted by: Scott in KC---------------------
Ahhh yess, the "Burp Koff" mod! He's a famous German mechanic that Tim stole from Klause Weinerschniztel a European privateer.
Posted by: Scott in KC---------------------
Actually, in respect to the guy that REALLY invented it, BRIAN KINNEY, I'll set the record straight. He deserves a lot of credit. Him and who ever spilled the beans on the gray wire!!
Man, I've been a smart-a$$ lately!!!
Posted by: Boozer---------------------
if you look on page 3-10 of your 250/426 manual, you will see an image of a 'BK' screw on the carburettor being discussed.
Posted by: blackhawk468---------------------
The mod that Brian Kinney is doing is basically an adjustment, the mod that I'm talking about is different and is more effective than the BK mod.
Posted by: Scott in KC---------------------
Well, then out with it!
Posted by: wayneo426---------------------
Blackhawk you cant just leave us hanging like that. Post some pics or pass them on, and I will post them for you. Spit it out bud!!!!
Posted by: Howser03---------------------
I don't even own a WR and I'm interested 
Posted by: vetwfo'er---------------------
Actually, the P-38 lightning was the first to limit the AP stroke. The BK mod is for the later model FCR's......... Post P-38. The modification limits the AP stroke (less raw fuel into the motor) which will NOT create a rich condition when the throttle opened.
vetwfo'er
Posted by: blackhawk468---------------------
Well Actually, The mod I'm talking about has nothing to do with the P-38 or the AP stroke. I don't know how to do it and I can't provide pictures. All I know is that it works, and he did it on Jeff Gibsons and Lance Hollister's bike. It was done on Tim Ferry's bike as well, and Yamaha took the bike apart and could not figure out what was done to it and they won't tell me damnit.
Posted by: DPW---------------------
Why can't you post the pictures ? If it's a problem of getting them on the interent e-mail them to me and I'll put them up.
Posted by: Howser03---------------------
I think blackhawk was just trying to give us contact information to the guy so we can ask him ourselves.
Posted by: wayneo426---------------------
:silly:
Posted by: Howser03---------------------
Blackhawk why are you selling your RM?
Posted by: blackhawk468---------------------
I don't know how the guy does the mod or what he does, so I can't provide pictures because I don't know what he did to it. I was just informing everyone that there is another mod out there that can be done its not the BK mod or the P-38 one, and I thought it was more effective.
I'm selling the RM because I'm trying to get money up to get a new bike being the serious motocrosser I am. 
I'm goin Blue!!!!
Posted by: Howser03---------------------
What size ya going for?
Posted by: blackhawk468---------------------
125, maybe 250F Don't think I will have enough for a 4 stroke tho!
Posted by: Howser03---------------------
Go for the 250 2-stroke, more power! AR AR ARH 
Your lucky your down south.... lotsa room to practice. You probably have a big track near ya too. Where I am up North there are no nearby tracks I know of, limited riding areas.....hey does anyone know any motocross tracks located in Virginia or North Carolina?
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