Originally Posted by maxwell 
im hearing what your saying but its not completely true.
no the dpm does not directly adjust the jetting. it controls the pressure to the float bowls based on temperature and elevation. and it DOES work. you need to set a good baseline for the dpm to either adjust + or - from your base.
every machine is differant and every owner has a differant comfort level of how safe they want there jetting to be.
heres what i have found with the many 800pteks i have dealt with.
main jet is a 440. in stock form you can vary from this down to a 420and maybe after riding it and checking your plugs and piston wash you may be able to move to a 410. with an aftermarket head with better cooling capabilities and a more efficient combustion like an rkt and a terra alps you may be able to move it down to a 400/390. DEPENDS.
i wouldnt vary more than one size at a time without doing those basic tests. why burn it down for a sled that works just fine from the factory with the 440 jet. when ever you start adding bolt ons like reeds/pipe/can you may have to run the 440 jets but it will clean up with the increased flow.
if your sled isnt crisp and quick reacting maybe you should be looking at another area of concern.
Well that's what I was hoping to hear. I understand the system does compensate, however it only adjusts what's already there to a preset measurement using other variables. What I know is with my sled it's not a very good baseline. The plugs aren't within range, and IMO, this isn't a good test alone. Most sleds that I have seen pulled plugs are running rich.
I know better to not jump with big increments, but I will lean it out a bit and see it's affects. I'm not a WOT kind of rider. I feel no need to. I can climb and do as much as most of my riding buddies using 1/2 or less throttle. I do use short stints of WOT, but only when required. I ride everything I own like this and it hasn't slowed me down. That being said I'm not a great sledder by any means. It's more about the feel and response I'm after.