Snapping Open the Throttle

10 replies to this topic
  • clark4131

Posted May 02, 2005 - 05:13 PM


I've seen a lot of people having issues with the bike bogging out when they snap open the throttle from idle. Although it's comforting to know that I'm not the only one, it's gotten me thinking... Here's my situation: I'm currently running all the free mods, a complete FMF system with Powerbomb and Q2 and the Barnum's Pro Airbox kit so the bike can suck and blow equally well. I've got the JD Red #4, Zip-Ty FS, #40 Leak Jet with a Boyesen Quickshot A/P Cover, 168 Main, 48 Pilot, stock Starter and PAJ ,though I have a 100 PAJ en route. With all this, I still have what I've termed as the "Throttle-Snap-Bog" or TSB. Environmentally, it's around 65 - 70 at 4700' ASL.

Now I know that when you initially open the throttle, you get the AP squirt to help with the low vacuum. Since I've experimented with every circuit in the carb except this one, I now believe it's due to my AP squirt being either too long or too short. I know the procedure for adjusting it according to the manual, so I think I'm going to play around with it and see what happens. If it doesn't work, I'm going to find a Cannondale and splice in the FI from it and be done with the whole issue of TSB :naughty:. Any advice is welcome of course. More to follow...SC

  • banffboy

Posted May 02, 2005 - 06:05 PM


On the older WR's you could do the BK mod (look on Garret's site for the tech info). I just saw an article on a boyesen a/c pump cover that is suppose to help this problem

  • Texas4play

Posted May 02, 2005 - 06:20 PM


68 pilot? Shouldn't you be around 48 (stock 45)?

  • clark4131

Posted May 02, 2005 - 06:32 PM


My bad...Typo...yes 48 Pilot...SC

  • shawnwt

Posted May 02, 2005 - 06:36 PM


my bike has the same bog 05WR450, I finally gave up trying to get the bog out,
when i realized it sure doesn't show up when I ride the bike , so why bother.

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  • clark4131

Posted May 02, 2005 - 06:47 PM


my bike has the same bog 05WR450, I finally gave up trying to get the bog out,
when i realized it sure doesn't show up when I ride the bike , so why bother.

It's the principle, dammit :naughty:. I want perfection! :naughty: ...SC

  • wr429j

Posted May 02, 2005 - 07:30 PM


I have the same type bog now that I removed the grey wire and the AIS, before removing them it was fine.
I am going to put in the JD needle setup and hope for the best. :naughty:

  • HarveyMushman

Posted May 02, 2005 - 09:18 PM


Same boat. I never had the bog until I removed the AIS. Whats that all about?

  • hotrunnin-05wr450

Posted May 04, 2005 - 08:34 AM


i have the bog, and all ive done in the throttle stop, and new exhaust system, i still have the grey wire.

  • snmhanson

Posted May 04, 2005 - 08:59 AM


I've done all of the main mods and I have the bog. I am going to try the 40 leak jet and see what happens. It doesn't effect me while I'm riding but it would be nice to get rid of it none-the-less.


  • gloft

Posted May 04, 2005 - 01:44 PM


I have a friend that claims to have fixed the bog on his son's 05 WR250 by going to the smallest leak jet available. Think I may try the same thing on my 450 since it's currently stripped to the frame.


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