Powerband

the powerband isnt something you can "locate" its like the way the power comes on.....it sounds to me like your running lean(wheather change?) maybe go up one on the main jet? or its time for a new top end

you can get a manual from any local dealer (you'll probably have to order it)
when was the last top end? (if unknown id doit it just for the sake of knowing how many hours it has, i suggest wiseco piston)

you might want to wait for some other members to respond just to make sure im right.....

Also, check the powervalve (KIPS) for proper operation. If the main valve is not opening properly or has too much carbon build up it will cause power problems.

look at my link below to see pages from the manual on how to work on the KIPS

Hey Jaguar, I'm interested in this topic as well, but that link doesn't work. Any chance it needs updating?

http://justkdx.dirtrider.net/

for all your kdx info needs.....

Check your jetting/KIPS like these other folks have said. The 'powerband' is not a part on the bike, but a term for when the bike 'gets on the pipe' and starts making power. It's really just slang for a point in the power curve. If you've ever seen one graphed you'll know that it looks like a peak/valley type graph representing power output @ certain engine RPM. The 'powerband' slang term came about due to the fact that two-strokes make sharp, abrupt power when in a certain RPM range, and not much power anywhere else. Sooo, when you hit this RPM range, your in the 'powerband.' Here, I'll try to represent the whole power curve thing for ya.

__
/ \
/ \
/ \
/ \
_/ \___
Two-stroke 'powerband'



___
___/ \
__/ \
/ \
4 Stroke 'Powerband'

Excuse my sad attempt at some ASCII Art! :)

Hope this helps.

$hit that didn't work. Oh well, hope you get the point.

I would check the carburetor first. If it ran fine before, you may have some trash in the carb, especially if it has set for very long since you last rode it. Also check for trash in the tank. I've had the filter in the tank get clogged up which restricted the flow of gas to the carb. This made the bike cut out while under a load. If your tank and carb are clean and you're getting plenty of fuel, then you might consider checking the power valve or your top end for low compression.