I have my buddy's raptor and it has a problem...when I go and start it it will only run with the choke on and then when I take it off it dies...I have cleaned both carb thogoughly and checked the diaphragms to make sure they were lubed and weren't ripped...I have narrowed it down to a vacuum problem because if I take my hand and put it over the intake to cut some of the air off it will run with and without the choke...everything is conected tightely and all lines are connected so what would you guys suggest or do they have airbox problems...thanks

 

one other thing that is important it is all stock engine wise and jets are stock etc

 

Alright so this is what I have established from messing with it a while longer...It was runnign while I cut off air because only one carb actually is working and the 2nd isn't getting any fuel so I blew air through the best that I could and put it back on and the same thing is still happening...Do you think I should get them rebuilt, get a single carb or what...The passage from carb to carb is fine and the 1st carb is fine where the inlet for the gas comes in it's the 2nd that isn't working

 

I have a similiar problem My second carb is not getting gas.
I learned to open the drain screw and suck on the drain tube till gas comes out.
It helps to get the gas into the second carb, once gas starts flowing, engine starts up and runs ok.
Im not sure whats causing it, possibly sticky float, but im not taking the carb apart anymore...

 

some1 said they cut out because of a reverse wire being the culprit but that doesn't explain why the second carb isn't getting any fuel.