325 polaris needle and seet cleaning

joeyrossmiller12 · #1 (**permalink**) 02-03-2012, 03:01 PM

Alright, the machine is a 2001 polaris trail boss 325. I have the common issue of fuel flowing into the air box. ALOT of fuel. Its filling up the air box halfway. I cleaned the crab out of the carb many times. every orifice, port, jet, everything, replaced the needle and the o ring, adjusted the float. anyone got any ideas? one of my buddies mentioned that maybe, possibly the carb is on backwards? I know I didn't put the carb on backwards but maybe the PO did? I'm kind of clueless at this point.

Also, When i got the float needle, all it came with was the needle itself and a metal cylinder (what it sits inside of in the carb) and I bought the o ring for the metal cylinder. What is the "seat" that everyone says to replace. Thanks

Manaen · #2 (**permalink**) 02-03-2012, 03:58 PM

The seat is either scewed or pressed into the carb body. It is the orifice that the needle rests on to shut off fuel flow. Normally it is not something you need to replace unless it has been abused (scratched etc) . Are you sure the drain lines are routed properly and clear? And describe how you set the float level.. sometimes. I find that it is helpful to take some pictures and post them. One that will help is the bottom of the carb with the bowl removed. And the other would be the carb installed . It is highly unlikely that you installed the carb backwards. The inlet and outlet are almost alway different sizes (to help build velocity) .

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**Bruce!** · #3 (**permalink**) 02-03-2012, 04:09 PM

Welcome to the board!

joeyrossmiller12 · #4 (**permalink**) 02-03-2012, 04:17 PM

could you tell me which part number the seat would be in this parts diagram... (ill post it on the bottom) I actually didn't have to set the float level. it was already pretty good. i just turned the carb upside down, and set it parallel to the bowl. I'll post a pic tomorrow. Where could I find out if my lines are routed correctly? the overflow lines coming off the top of the carb just come together with a tee connector, and the third line is just free.

joeyrossmiller12 · #5 (**permalink**) 02-03-2012, 04:19 PM

here's the link to the parts diagram... OEM Parts Polaris TRAIL BOSS (A01AA32AB) 2001 CARBURETOR - A01AA32AA - Cheap Cycle Parts

tt425 · #6 (**permalink**) 02-03-2012, 04:33 PM

I don't mean to interrupt but thought I would share some ideas. Item#24 is the needle and seat assembly. Item#26 is the pilot jet. I would suggest you remove it again and see if it is free of obstructions. The hole in it is the size of small fishing line. I don't take but a very small piece of trash to stop that hole up. Double check the pilot jet. Another thing to do is verify the numbers that are on the jets and make sure they are correct. They have #'s on them the pilot jet is a #50 and the air jet is #175(item #46 in the diagram) and the main jet is a #175(item#11 in the parts diagram.
I just when thru a main jet mixup on a Yamaha Rhino that someone tried to repair before they brought it to me and the main jets were in the wrong places. Allthou I don't think yours can be switched. I was suggeting that in case someone may have put some wrong parts on before you got it.

joeyrossmiller12 · #7 (**permalink**) 02-03-2012, 04:43 PM

I will definitely check that out. at this point im looking for all possible solutions. the seat is what i thought it was so thats all good. i guess ill just start going over everything for a 10th time haha

tt425 · #8 (**permalink**) 02-03-2012, 04:53 PM

I removed the Yamaha carb about 12 times trying to figure out what was going on. Sometimes we overlook some of the simple things. In my defense 99% of the time I work on Polaris older models. It's still not an excuse I should have known better. LOL. After rebuilding more than 50 carbs last year that was the first time that had ever happened.

john luttrell · #9 (**permalink**) 02-03-2012, 06:16 PM

If I recall correctly, there is a bracket that attaches the carb to the frame or motor mount, that prevents the carb from vibrating excessively during higher rpms. With out it, the vibration from the engine can cause the float needle in the carb to come off it's seat and flood the bowl with excess gas.

Manaen · #10 (**permalink**) 02-03-2012, 08:32 PM

Quote:

Originally Posted by john luttrell

If I recall correctly, there is a bracket that attaches the carb to the frame or motor mount, that prevents the carb from vibrating excessively during higher rpms. With out it, the vibration from the engine can cause the float needle in the carb to come off it's seat and flood the bowl with excess gas.

That would be new to me. Think about what you're saying. The engine vibrates less then the frame does while driving. These carbs are meant to take the vibration of bouncing over trails. They are mounted with rubber boots to help. But bolting a carb to the frame would only amplify the problem.

The only thing close to what your talking about would be a splash gaurd. They are a small plastic cone inside the bowl placed over the main jet. Its only job is to even out the mixture over rough terrain. It does this by keeping fuel from sloshing directly into the main.

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