2009 Sportsman 500 H.O. Fuel Pump - Page 3 - Polaris ATV Forum
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post #21 of 44 (permalink) Old 02-15-2017, 08:31 AM
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If fuel is overflowing then you need to set the float height and check the needle tip. One of the two is allowing too much fuel into the carb.

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post #22 of 44 (permalink) Old 02-15-2017, 08:50 AM Thread Starter
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Kinda what i thought. Hard to start, rough idle pops a little out muffler, hard to set idle RPM as once you hit the gas after setting it changes, and as it starts to warm up you slowly see end of bowl tube getting wet and when you give it throttle it starts flowing more gas out of it. THrottle repsonse is delayed and if I give it a very slow gradual throttle it spits and sputters more and cuts out completely.
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post #23 of 44 (permalink) Old 02-15-2017, 09:15 AM
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Quote:
Originally Posted by polarisman1999 View Post
Would this be a lean condition with fuel coming out bowl overflow?
yeah, things that make you go HMMMM....Popping out the exhaust is indicating lean, but fuel out the overflow screams rich...

Could have the wrong jets in it that make it run lean at idle, and the needle and seat or float wrong letting fuel run rampant. Or the pump could be at too high of a pressure over coming the float. Carb pumps should run less than 10psi. I am thinking around 7psi. If the fuel pressure is too high, it could be pushing the needle off the seat.

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2001 Magnum 325 with a blown engine; rebuilt 2004. Broke timeing chain 2016 rebuilt again and still running. Warn winch and Moose 60" plow

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post #24 of 44 (permalink) Old 02-15-2017, 09:56 AM Thread Starter
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Pump does seem to have lots of pressure. Havent actually measured, only by feel.

Last edited by polarisman1999; 02-15-2017 at 10:05 AM.
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post #25 of 44 (permalink) Old 02-17-2017, 04:43 AM Thread Starter
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So if I do have two conditions existing here as a lean/rich condition if possible, what do I look at for lean condition. The jetting is right at 152.5 and 40 in carb now...
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post #26 of 44 (permalink) Old 02-17-2017, 05:50 AM
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The only thing I can come up with is the bleed screw.....It should be on the bottom of the carb in line with the throat. Could be covered with a metal plug over the hole if it has never been apart before. If it's on the engine side, it controls fuel so turn it out to make the mix richer. If its on the air cleaner side, it controls air so turn it in to make the mix richer.

Changing the fuel/air mix this way will effect the entire rpm range. but is sounds like you have 2 different problems. Just as a confirmation, fire it up and just let it idle for a few minutes. Pull the plug and see what you have. If the mix is too lean, your plug will probably be white. If its rich, it will be black and/or wet with fuel.

1st Machine
2001 Magnum 325 with a blown engine; rebuilt 2004. Broke timeing chain 2016 rebuilt again and still running. Warn winch and Moose 60" plow

Wife's machine:
2007 Sportsman 500 EFI, Polaris Winch, 26" Bear Claw HTRs on Moose 427x Wheels. 12x7 front, 12x8 rear, QSC Clutch Kit
My Trail Machine:
2004 Sportsman 600 Twin, 25" RipSaw Tires on stock steel wheels, Moose rear box
Completed Project machine:
2001 Magnum 325 MOSE with a blown engine. Transplanted a 2005 Magnum 330 engine. Committed suicide on the trail Oct 2016. Spun Rod Bearing after oild cooler line failure. Rebuilding Engine.
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post #27 of 44 (permalink) Old 02-17-2017, 08:13 AM Thread Starter
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Thanks stave, will look and try tonight.
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post #28 of 44 (permalink) Old 02-17-2017, 06:18 PM
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Here's a link on rejetting, pretty good info.

FAQ rejetting 101

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post #29 of 44 (permalink) Old 02-18-2017, 06:30 AM Thread Starter
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Thanks Indyred. Last question for now to anyone. The bleed screw talked about above. Is there a such starting point with these since I dont see a way to get any screwdriver in there to adjust with carb all hooked up.
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post #30 of 44 (permalink) Old 02-18-2017, 09:14 AM
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Yeah, they are a pain to get to....you will have to take the carb off to get to it. Don't remember if you have a manual or not but that would tell you where it is supposed to be. I can look in mine if you need it. The spec will be a number of turns. Which means that you turn it all the way in and lightly seat it, then turn it back out the specified number of turns.

When I think back, popping out the exhaust when it is running is a rich condition. Especially with the excess fuel coming out the overflow. Does it run fuel out when the machine if off? If not I would give that fuel pump a look. With the aftermarket carb, you should take it off and check the bleed screw, jets and float level anyway.

1st Machine
2001 Magnum 325 with a blown engine; rebuilt 2004. Broke timeing chain 2016 rebuilt again and still running. Warn winch and Moose 60" plow

Wife's machine:
2007 Sportsman 500 EFI, Polaris Winch, 26" Bear Claw HTRs on Moose 427x Wheels. 12x7 front, 12x8 rear, QSC Clutch Kit
My Trail Machine:
2004 Sportsman 600 Twin, 25" RipSaw Tires on stock steel wheels, Moose rear box
Completed Project machine:
2001 Magnum 325 MOSE with a blown engine. Transplanted a 2005 Magnum 330 engine. Committed suicide on the trail Oct 2016. Spun Rod Bearing after oild cooler line failure. Rebuilding Engine.
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