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Common Carb Issues

228358 Views 133 Replies 74 Participants Last post by  latebird
Just trying to get a list of common carb issues for a 2002 TB.

From what I was able to get from the parts guy from the dealer was the following.

- The needle and seat was a common part to wear out which hinders the carbs ability to prevent fuel from back-flowing out and getting into the air cleaner.

- The pilot jet. Mentioned that it can be cleaned but at $6 it is not a bad idea to replace it.

I am currently trying to resolve a car issue I have right now and would love the feedback.

Please let me know of any other common carb issues. Once I get a bunch of isses I can post the issues and cause.
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Here's a blog post I saw while looking for ways how to clean carb. Just wanted to share this to you guys, it helped me and i hope it will work for you too... :) http://www.iultrasonic.com/polaris-sportsman-atv-carb-ultrasonic-cleaning.html
If it has a fuel pump the filter is located near the pump as it's headed to the carb. but yes the best thing to do for your fuel system is to add a fuel filter. I personally like the clear ones so i can see if the fuel is flowing ok.
I have no idea if you guys are talking about a trail boss (4-stroke) or the trail blazer (2-stroke). They are completely different carbs and the 4-stroke one is a lot more complex. I believe it has an accelerator pump in it. I had a guy rebuild the 325's carb because it is pretty complex; the needle and seat are what he said stick a lot and you can't fix it, just have to replace. I'ts been about a year now and I have not had a problem with it. The Polaris replacement parts are about $40 for the needle and seat. FYI, he said on the 325, they will run completely differently if you have an air filter on/off and/or the airbox lid on/off. Here is is website; he is local to me here in Dallas. PolarisATVrepair.com | Local ATV Full Service, Engine Rebuild Services, Engine Rebuild Kits, Clutch Puller, Bearing Kits and more! His specialty is actually repairing/rebuilding 400 2-stroke engines, and people mail him complete engines from all over the USA.

On the 250 2-strokes that I own, the carbs are very easy to take apart and clean. We have 3x 250's, and I have had a 400 Scrambler in the past. One of the float needles leaked after converting the bike to premix, but no big deal.

I have taken all of the 2-stroke carbs apart and cleaned them when I first got the machine. Converted all the bikes to premix at 32:1 with polaris gold oil, and run stabil in the gas. Only use them 4-5 times a year; never had a problem with needing to rebuild the carbs. I've had the 2-strokes 4 years so far.
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awesome articile. Thanks.. I have a 2005 500 Sportsman HO. Whats entailed in taking the carb off and cleaning it? Is it hard to get off the quad? I notice the 4x4/s are way harder to get to things as opposed to the sport quads. I had those my whole life but just got my first 4x4 this year.
Anti-sieze is what you use to keep screws from corroding,thus making them hard to get out resulting in stripped heads.
I replaced mine with little socket head screws of the same thread specs.
Have a problem with my 01 sportsman 500. It will start right up but after about 30 seconds at 1/4 to half throttle it will start to sputter and eventually die. But if you go to full throttle it will run fine. And after it dies it takes awhile for it to start running again. Has this happened to anyone or does someone know where to start lookong for a problem? Thanks
Have never adjusted valves. I have taken the carb off and removed the bowl and everything looked clean. I sprayed carb cleaner in all the jets. None of that stuff helped.
Not sure how many miles are on it. Digital display doesnt work. I am sure there are alot.
I would get them checked if there tight the valve will not seal and you would get low compression and the motor will not run right.
Ok so im having issues. I have a 98 scrambler 400 an it runs fine when its cool but as soon as the engine warms up it stops getting fuel. When i first start to ride the fuel filter will be full and then when it warms up it wont take gas. It still gets enough to idle just not enough to take throttle. When this happens the fuel filter will be empty. Ive got fresh gas and a new fuel filter. Please help anybody have a clue whays wrong with it?
I have never expeienced this with a gasoline engine but I have multiple times with diesel tractors. try looking for a secondary fuel filter, it could be almost anywhere (tucked up in the frame on the bottom of the tank etc.) but on those diesels thats what it was.
I have a '93 350L 4wd. it was parked for like 7 years with no gas in it and some leaked into the carb. so it was fairly clean. I have it running but it will not idle, backfires, is hard to start without starter, the throttle is full blast or none fluid and sometimes floods with no way to slow down except to shut off the key. I recently leared that if I blow in one of the vent tubes it will start easily but all else is the same. today when it flooded i took out the air filter and saw that the gas had backed up into the carb, and that when I blew in that one tube it made the puddle bigger. is it the needle and seat or the vent tubes or something else? any help appreciated, thanks!
i have 95 magnum 425, ive had nothing but problems with the carb for the past 5 or 6 years. We replaced every component released by polaris and it still hasnt returned to normal power, tops out at 30, understanding its worn and beat on, what can i do to bump up the power.

Also i need to replace the starter, have some mechanical background but have no idea where to start on it, any help would be appreciated.
My 94 300 2x4 bogs down when I give it throttle, sometimes it will be fine and sometimes ill be giving it half throttle and itll hardly be moving....would this be a main jet issue? Since it happens at half throttle and full ?
sOUNDS LIKE IT TO ME, but a ignition coil could do that too.
My 94 300 2x4 bogs down when I give it throttle, sometimes it will be fine and sometimes ill be giving it half throttle and itll hardly be moving....would this be a main jet issue? Since it happens at half throttle and full ?
I would try putting a new spark plug in it first. They are about $3 at Oreilly Auto.
okay cool thanks ill do the plug first...we dont have a oreilly but napa will prob have it. Do you know what part number/model it is?
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