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Motor stall when throttling on

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I have a 2006 WR450F that has many mods already done before I purchased however I have an issue which I am trying to determine if it is the "bog" issue. I am running a Rekluse Z-Start Pro, rolling down a single track usually in third gear and approach an obstacle. I throttle on sharply to raise the front end and the engine dies. Can also happen from time to time in first and second gear, but usually always from an idling roll. Is this the "bog"? Just trying to determine if that is the direction I should start my troubleshooting with.

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It could be many things.

Assuming your carb is perfectly dialed in, it would be considered bog; an accelerator pump system that is inoperable, or one that has never been set up (they are not from the factory).

...but just a mis adjusted fuel screw can do this too.

You need to know exactly what is in and what has been done to your carb in order to know what needs to be done.  The term 'mods' is too vauge.

Carbs are a pain, but the actually are higher performance than FI.  If you take the time to get to know everything your carb is doing, then it's easy to keep it running great.

http://www.pbase.com/jdjetting1/keihin_fcr_manual_views&page=all

http://www.dirtrider.com/features/protips/141_0707_keihin_fcr_carb_rebuild/

 

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Yep classic signs of AP not working, or the passage /nozzle is blocked (which happened to mine)

 

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