4th gear bog


9 replies to this topic
  • Island Boy

Posted March 17, 2008 - 03:13 PM

#1

I have done all free mods on my 07 WR450, AIS removed, Dr. D Full Race Exhaust, JD Jetting (170, 48 and Red Needle at 4th clip, I think) for sea level, 80-90 degree temp.

The jetting (i think) is pretty much spot on but I sometimes notice a bog when i whack the throttle hard in 4th gear (at the lower end). This happens just before a wheelie... on a rare occasion when i think i am in 3rd but i am actually in 4th.

I recently purchased and installed the R & D Power Pump with the stiffer spring and set the ALJ at #40. Throttle response is definitely crisper but the 4th gear bog is sill there. I have adjusted ALJ to #30 and #50 and it's still there.

Can i get rid of this bog? What should i do / change / adjust?

Thanks.

  • Mutu

Posted March 17, 2008 - 06:50 PM

#2

Lockwire AP actuator arm.

You do have an adjustable fuel screw, don't you?

  • KennyMc

Posted March 17, 2008 - 07:05 PM

#3

The JDJetting kit came with the o-rings for the accelerator pump. Did you use one of them?

  • Island Boy

Posted March 18, 2008 - 05:00 AM

#4

Lockwire AP actuator arm.

You do have an adjustable fuel screw, don't you?


R & D told me the stiffer spring i installed does the same thing as the AP lockwire or o ring mod.

I dont have an adjustable fuel screw because i only ride at sea level.

  • Island Boy

Posted March 19, 2008 - 08:33 AM

#5

is it fuel mixture?

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  • dugabrams

Posted March 19, 2008 - 09:24 AM

#6

Virtually every bike needs a fuel screw for crisp throttle response (unless you can adjust the stocker properly, which I doubt)

  • Mutu

Posted March 19, 2008 - 11:57 PM

#7

R & D told me the stiffer spring i installed does the same thing as the AP lockwire or o ring mod.

I dont have an adjustable fuel screw because i only ride at sea level.

Get one!!! That may clear up your problem! It may suprise you the difference these babies can make to the throttle crispness and up to 1/3 throttle performance. They are cheap (and in my books a necessary) mod to do.

is it fuel mixture?

Yes.

  • Mutu

Posted March 19, 2008 - 11:57 PM

#8

Virtually every bike needs a fuel screw for crisp throttle response (unless you can adjust the stocker properly, which I doubt)

Yep! :confused:

  • Island Boy

Posted March 20, 2008 - 05:29 AM

#9

Thanks guys... ordering one today!

  • maxtherat

Posted March 20, 2008 - 10:13 PM

#10

When you say that you whack the throttle hard does that mean wide open? If so, since you are using the red needle maybe try the 168 main jet.




 
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