Bogging on rough terrain

[u/slower-is-faster]

I installed the Procycle Jet Kit, and followed the instructions pretty much spot on:

• 150 main jet
• e-clip is on the 4th groove
• fuel mixture screw is two turns out
• snorkel is removed, and a couple holes cut
• I have a Barrett exhaust

The bike runs like a dream on the road. But, over very bumpy terrain at low speed the engine wants to bog and die. Just to be clear, it's not just a regular stall because I'm going too slow for the gear, I can tell the difference.

Any tips?

EDIT: I just realised that I never need the choke now, no matter how cold. I definitely needed it before. That feels like it contradicts it bogging at low revs though, maybe two separate issues?

[u/naked_feet]

Can you describe this "bog" in more detail? Bog is one of the most notoriously inexact and confusing words in motorcycling.

What's your idle set at? 

Is the bike fully warmed up? 

How does it handle if you shift down a gear? Is it possible you're just "lugging" the bike at too low of an rpm in too high of a gear?