i have a polaris sport 400 water cooled if the restricter piece is taken out will it make it do this or could it be a bad stator

 

Dont understand your question, what restrictor piece?

 

the restricter im talking about is in the reed valve but there is one there. it runs but when you rev it revs a little then bogs and if i go full throttle it backfires. i was told it is a faulty reverse rev limit switch. is this possable and how do i bypass

 

Does it get better when you push the overide button?

Looking at the wiring diagram just unplug the black wire. It looks like it sends the signal to the cdi box.
the yellow red wire goes to the stator to get a rpm feed.
the green wire goes to the override button.
the white wire goes to the throttle safety switch
So it appears that this will eliminate your ETC.

 

it should be running bad pretty much once you throttle it up at all if it's the override kicking in and wouldn't wait until you 1/4 throttle.

 

i did disconnect the black wire and it didnt make any improvment so im back to thinking carb or is there anything else

 

Well you are on the right track. think spark, compression, and fuel. which one has the problem? It is likely either lack of spark or too much fuel.
Carbs are pretty simple. If it is stock it will have around 210 mainjet, and a 35 pilotjet.
set the float height. It should run, unless the needle is missing. that white plastic peice is missing from the reedblock, i've never tried running without it. So I don't know. do you still have it?

After that it's on to the CDI, coil, plug wire and cap, trigger coil. check the resistance of them or find some parts that are know to be good.