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1995 Polaris magnum 425 will not run with airbox hooked up


Kurt Reiser

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Ok the reason I’m asking:

1. I’m wondering if there is a problem with the vacuum where as soon as you hook the air box up the vacuum lines are drawing all the air from the air box starving the air flow into tye carburetor. Why? No clue! Just wondering if that’s what’s going on. May sound stupid but you never know   

Try to move the needle on the carburetor and see how that goes.  Make sure you remember where the clip was on the needle before you move it. 

  If that’s not the fix then disconnect all hoses going to the air box, reconnect to the carb and try to run the bike and see what happens.   

Side note. That clip and spring set up in the carburetor can be tedious. Parts can fly off and never to be found again. Work in an area that will prevent that from happening.  

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Did you check the carb to see if it  had  both the  air screw  and the fuel  screw? I can't see the  air box being a problem  unless either the  main  duct to  atmospheric air  is severely  restricted or the air filter  plugged.  The amount of air a vent or vacuum line connected to the  box would affect would be absolutely minimal .

When  you  move the  clip on the  slide needle , you  should only try one  notch at a time up  or  down at a time  from the original  setting .

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10 hours ago, davefrombc said:

Did you check the carb to see if it  had  both the  air screw  and the fuel  screw? I can't see the  air box being a problem  unless either the  main  duct to  atmospheric air  is severely  restricted or the air filter  plugged.  The amount of air a vent or vacuum line connected to the  box would affect would be absolutely minimal .

When  you  move the  clip on the  slide needle , you  should only try one  notch at a time up  or  down at a time  from the original  setting .

I agree👍  Although....  I moved my needle on my sportsman's carb up two notches...  problem solved.  no more adjustment needed- the bike runs perfect.  Its got to be something big that we are just missing to be causing the bike to just not run....  Are you sure its starving for air and not fuel?  I mean it seems pretty obvious to me that its air...  but I wouldnt just rule out the fuel till you're sure.

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Frank I was having problems signing in for some reason I’m very illiterate when it comes to these computers what I said was I don’t think it would be a carburetor problem both carburetors are doing the exact same thing. there is  only one screw on the bottom of the carburetor I’m not quite sure if you asked that question it seems like it’s something very simple because the bike runs great as long as you don’t hook up anything to the back of the carburetor it’s bizarre There are no obstructions in the airbox there are no obstructions in any of the vacuum lines I will check the cam and check the valves check the plug have move the needle up-and-down one groove at a time.Sorry if I sound repetitive I’m just getting so frustrated

Edited by Kurt Reiser
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If its worth it to you, I would love to take a look at your bike if you brought it down to me-  I cant come to you because I'm under-aged and cant drive yet😣

im in christiansburg VA.  If you are interested, massage me privately and I can send you my address.

but if you want to figure this thing out on your own, I totally understand!  I'm just really curios as to what the issue turns out to be.

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