yz400 jetting

5 replies to this topic
  • Bob_Collier

Posted April 24, 2001 - 02:38 PM


Have p-38,white bros. 3/4" tapered pipe and e-series-pro-mag. Need to know changes to carb.

  • yzf

Posted April 24, 2001 - 04:23 PM


thats great and all but we really need to know your elavation to sug. any carb settings also how many disks if any?

  • dirtdad

Posted April 24, 2001 - 05:04 PM


which bike maybe?

00 YZ426F
01 TT-R125L (my son's)
91 CR125
83 YZ490
74 Hodaka Super Combat(gone but not forgotten!)

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  • dirtdad

Posted April 25, 2001 - 03:12 AM


okay, okay, I'm a dumb sh*t! duh!

  • Bob_Collier

Posted April 26, 2001 - 12:32 PM


Originally posted by Bob Collier:
Have p-38,white bros. 3/4" tapered pipe and e-series-pro-mag. Need to know changes to carb.

I have a 1999 yz400f, I have 12 disc in the pipe. Plan to use for flattrack so will be wide open most of the time. Hope this is enough information for some help.

  • Bill

Posted April 26, 2001 - 04:04 PM



DVP #4-5
Fuel Screw 1-2 turns
48-50 Pilot jet
170-180 Main jet

This should get you close for sea level to 2,000 feet above.


97 KDX220, 86 TTR225, 99 WR400f, WR timing, throttle stop trimmed, air box lid removed, White Bros head pipe, silencer and air filter. De-octopussed. Works frame guards and Thumper Rad Guards, Scotts steering damper. Odometer and headlight removed. Cycra Pro-Bend hand and mud guards. YZ stock tank, IMS seat and number plate. Renthal Jimmy Button "highs" and Renthal Soft half waffle grips. AMA, SETRA, Happy Ramblers MXC, Rausch Creek MXC, Tower City Trail Riders.

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