BK Mod

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Hot4Teacher

Member

Apr 21, 2002

87

0

• Jun 12, 2002

• #1

I have a '99 yz400f. I hear alot of prople doing a BK mod on the newer thumpers. I was told that the mod can't be done on the 99 because of the different carb. Is this true? or is it just a little different technique on the older yz's? Any help would be greatly appreciated. Thanks.

 

Senior KX Rider

Super Power AssClown

Nov 9, 1999

8,575

0

• Jun 12, 2002

• #2

moved

 

E

endosports

Member

Jan 10, 2002

494

0

• Jun 13, 2002

• #3

Different carb all together... I haven't looked at it closely on the 400 but i believe that it is not possible.
I have done this to my 01 426, but it is a different carb all together. Can't tell you how much this mod has helped me out.

 

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Shawn Mc

Member

Apr 8, 2002

152

0

• Jun 14, 2002

• #4

You can acheive the same thing with a p-38. Its an acclerator pump housing that replaces the stock one. I wish I could remember the Manufacturer. You can get it at MR.X i think.

 

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stormer94

~SPONSOR~

May 30, 2001

589

0

• Jun 17, 2002

• #5

P38 info

http://www.mxsouth.com/perp38lit.htm

I just got mine, haven't put it on yet though.

 

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Hick

Member

Aug 15, 2000

224

0

• Jun 18, 2002

• #6

You can buy an RC Wheel Collar and install it on the pump actuating rod for the same effect.

Click HERE to get the wheel collar, apparently the 3/32" collar fits best. The idea is the collar fits on the rod, acting as a stop to limit the pump stroke (ala infamous BK mod). Cheaper than the P-38 and infinitely adjustable.

I have not tried this myself, but plan on using my friends 520 EXC as a guinea pig. At any rate a few guys at Thumpertalk have tried this with some success.

Hope this helps.

 

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Hot4Teacher

Member

Apr 21, 2002

87

0

• Jun 20, 2002

• Thread starter
• #7

Thanks guys for all the information. I really appreciate it.

 

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Shawn Mc

Member

Apr 8, 2002

152

0

• Jun 25, 2002

• #8

Hick has the set up. 89 cents verses 103 bucks, even an over paid freestyler can figure that out!