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Flipper Tiffany Roper Jones

Polaris 500 sportsman give it gas stalls

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I don't care if the carb is brand new. You have a leaking needle seat like I and the previous poster mentioned. Your compression tests are extremely high because the motor is flooded with fuel and almost to the point of liquid lock, further cranking of a liquid locked motor can also cause rod bearing damage and failure.

The needle and seat will be where it's supposed to be yet it is not stopping fuel from flowing from the back side of the seat where the o-ring that is suppose to seal and hold the seat in place. If you take the needle and float off and the seat is easily pulled from the carbs body it is leaking. 

Even a good sparking spark plug will not spark when the carb is delivering too much fuel.

 

  

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So I was checking it out today and watching videos while I had flywheel off well in the video the key for flywheel is straight up and down with top end end the flywheel theres three notches and back behind them theres a t I didn't know that I ligned it up with the middle of the 3 notches so do I line timing up with t instead I lined it up with the t but I'm curious so I'm asking b4 I try to start it cause if I do it was like 40-45° out of time

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Well put it 100% in time got the compression down to 138-140 but that's all it did still doing the same exact thing. Question though will it still give gas to the carb if your not turning the bike over like if I take gas line off to the carb gas still comes out. I checked the carb it is not leaking gas any where pulled the spark plug and nothing blew out of it it's not getting liquid locked at all. So I'm tearing the head off of it today to take s look at it. I lashed all the valves at .006 just figured I would ask you guys if it sounds right that's what my book says.

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Sounds right to me.  If your pulling the carb off try something please to kill my curiosity.  

Put a clean hose on the fuel line of the carb and then turn the carburetor upside down and blow into the hose as hard as you can.  See if there is an air leak. Even if it’s minor it’s not good.   

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Ok that’s good. Now that float needle seat that the pin sits inside have you removed that and checked that it’s properly seated and the gasket or o ring is in good shape ? 

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Yup undid the little screw and pulled the seat out looks great. I got the head off right now taking a look at it. I'm damn good at fixing quads I do it almost every day but this one has me horribly baffled I no why gas is getting in the oil I have to turn it over about 50 times for it to start but when it does idles perfect when it doesn't start I pull spark plug nothing is coming out of spark plug whole its just kind of a little damp like you start it. Got the cam out now I didn't by rockers just the cam now the spigot and not sure what it is is it supposed to snap back really fast or just put in just for it to work when I put it in I spun the spring around once so it was a little stiffer but not sure if that's right

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It's kinda hard to explain on the end of the cam I would call it a balancer but not exactly sure what you technically you would call It on opposite side of the sprocket there what I would call a balancer on the end of cam. Theres a spring and looks like a balancer. When I put the new cam in spring seemed loose so I spun it around once then put I it back in so snaps back kinda quick instead of very loosely hard to explain but heads off now everything looks good beating my head against the wall

 I dont understand it at all

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Ok take a deep breath there is a reason why and you sound  like the type of person who will certainly get to the bottom of it as well as some help from us here at Quadcrazy! 

The springs on the cam should be the assisted compression release.   

Post some pics.    

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Is supposed to be snug not super tight. There are a few different types of decompression mechanisms. Polaris is one of the far different ones I’ve seen.  The spring is a small round baby spring that sits in a hole? 

Go to YouTube and take a look.  Keyword Polaris cam decompression. 

I want you to try one more thing please.  Can you kinda do a bench test on the carburetor.  

Take the carburetor and mount it firmly.   Use some tie wire if you have to. Make sure it’s in the proper upright position and make sure the throttle cable and slide is all back together as if it were ready to be used.  You have to see what that thing is doing.  

Hook up the fuel line and open the petcock  Watch that baby for a day and see if any fuel is leaking out of it. Put a piece of cardboard under it as I mentioned earlier.  

Could be an internal failure that your not seeing. Maybe a fracture or something. 

 

 

 

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Well the gas is not magically getting into the oil. It could just be a slow drip. See what happens. 

Edited by Frank Angerano

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Is that fuel line hooked up to a fuel source? 

That’s actually a great question and something I’m going to seriously look into. Maybe that decompression not working pulls a vacuum ? It’s definitely a possibility. 

 

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Yea I have it straight from gas tank to carb.

I was just wondering cause before fuel pumps the compression is what sucked the gas it needed so if its pulling so much where spark doesn't work and why its turning over so ridiculously hard reseated valves going back together  now 

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