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  #1  
Old 01-29-2007, 12:46 PM
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Default 97 sportsman 500 carb problems

I was told I needed a new carb... so i got one... but its still blowing raw gas out the back of it...it runs better without the air filter can anyone help ?
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  #2  
Old 01-29-2007, 01:26 PM
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Default 97 sportsman 500 carb problems

We had a similar problem on a 97 or 98 sp 500. Going downa the road at full throttle it would stumble and run rough until we feathered the throttle a bit until it came out of it. When we looked at the boot between the air box and carb it was all wet. When we pulled the pre-cleaner off the air filter it ran better. I would sugest the a new air filter and the new type of pre-cleaner.
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  #3  
Old 01-29-2007, 08:17 PM
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Default 97 sportsman 500 carb problems

Its running too rich , lower the needle a couple notches and see if it runs better, raise the clip up this lowers the needle down.If you cant make enough improvement go lower on the main jet.
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  #4  
Old 01-29-2007, 08:17 PM
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Default 97 sportsman 500 carb problems

What do you have the fuel screw set at? Seems like you are getting to much fuel. Try turning it all the way in. Then back out 1 1/2 turn, to start. When you say it runs better without the air filter on, does it rev up properly? And does it bogg down around half throttle with air filter on? If so do you have a precleaner in the inlet of your air box? If not, with it running, grab your rubber intake boot on the air box and squeeze it closed about half way and then hit the throttle. Give it a try.
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  #5  
Old 01-30-2007, 09:49 AM
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Default 97 sportsman 500 carb problems

the only outside ajustment on the carb is the air screw/pilot screw ...it revs up fine without the filter but you cant even get half throttle with it on it doesnt look dirty at all its got to be the carb or something making it throw gas into the filter .....will try setting the air screw again
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  #6  
Old 01-30-2007, 10:14 AM
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Default 97 sportsman 500 carb problems

did you put the stock jetting back in the carb and set the c clip back in the right slot. make sure the air screw was set back at the right turns out. w/ the filter off it would run leaner as would a cracked carb. boot not richer. make sure the float level in the bowl is set level as well.
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  #7  
Old 01-31-2007, 12:54 AM
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Default 97 sportsman 500 carb problems

does it sound like it wants to back fire right through the air box, you may have a bad cam. do you run a lot of short trips? If so this will build condensation up inside the engine and when water is at the bottom of either the tank or crankcase it will be pumped right up to the highest point of engine thus wearing the big lobe on the camshaft(exhaust). When the lifter tries to go over the worn lobe it just spits back through intake. Just a possibility, Happy Hunting [img]i/expressions/face-icon-small-smile.gif[/img]
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  #8  
Old 02-01-2007, 12:07 AM
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Default 97 sportsman 500 carb problems

I am with jts4455 on this one. This sounds like a mechancial problem at the head or exhaust. Add to a bad intake valve or restricted exhaust system to jta4455's list.
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Old 02-01-2007, 12:07 AM
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Tags
1997, 2007, 500, adjustment, air, carb, carburetor, intake, pilot, polaris, problems, rebuild, screw, sportsman, troubleshooting, valve



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