Common Carb Issues - Page 3 - Polaris ATV Forum
ATV Repair and Maintenance Having problems? Doing a rebuild? All Repair/Maintenance Discussions here.

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post #21 of 118 (permalink) Old 04-24-2011, 11:32 AM
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i'm missing part number 28 on the exploded view. is this a bolt or screw or what is it? my center needle seat slides up and down freely
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post #22 of 118 (permalink) Old 04-24-2011, 12:24 PM
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UPDATE! I checked the carb and the floats was out of adjustment and uneven so i straightened them up and pushedthe lil tab down so that the arms sit parallel. I also put the new 280 jet in. Now that i have done that it still cuts out. Does anyone think that the reed gasket maybe leakin? I read in another topic a few ppl had similar issues and corrected it by puttin a new gasket on with rtv silicone sealent. I dont know what else to do. I took it out for a ride yesterday and it took almost 30 mins of riding before it started cutting out.

1998 Polaris Sceambler 400
Mikuni VM38 Carb w/280 Jet
84.5mm Wiseco Piston
K&N Filter
HSP Exhaust
Ported & Polished Intake&Exhaust
ITP Mudlites
23x8-10 Front
22x11-10 Rear
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post #23 of 118 (permalink) Old 05-13-2011, 05:09 AM
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have a gas leak. tank okay hoses okay as far as i can see and feal gas tank will leak until it is empty was told its a carb problem any suggestions? im 64 dont know names of parts in anything but i can replace things thanks for any help ray
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post #24 of 118 (permalink) Old 05-14-2011, 10:21 AM
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raywag

Sounds like your floats are sticking. What kind of carb is it and what kind of Polaris do you have?
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post #25 of 118 (permalink) Old 05-14-2011, 03:12 PM
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kids from next door was here and fixed it float was stciking nice to have youth around thanks for the reply
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post #26 of 118 (permalink) Old 05-29-2011, 11:27 AM
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Carb puking gas

My son just bought a used 2000 Scrambler 500, and we have been trying to chase down some carb problems with it. The Carb is puking gas into the air cleaner. We've taken it apart, and cleaned it. We read the advice on carb problems here, but haven't made any head way on this. We adjusted the brass fitting on the float, thinking it was filling to much, but that didn't seem to work either. He is taking it apart as we speak, and we are going to try and clean the needles again. If anyone else has had this problem, I would really appreciate any advice!! Thanks, Mac
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post #27 of 118 (permalink) Old 05-31-2011, 05:39 PM
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heres a question i have a 94 trailboss 350 4x4 now when i got it was running like crap, cleaned the carb 3x on the last 1 i noticed that the main jet was a size 105, i think i seen somwhere it is stock at 140 or 145? is this true? so i got a size 140 jet from a buddy and put it in, first the jet's where not the same, but both fit in the carb, i think 1 might be longer then the other, 1 i needed a small socket to get it out, the other i needed a flat head to get it in, im kinda new to this, so is this right? i had it up at 8k ft, it ran pretty good for a bit then after half an hour, ran like crap, good in the low ranges, but would die in wot, so im guessing its the jet right?
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post #28 of 118 (permalink) Old 06-05-2011, 07:26 AM
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need help

i have got a 2004 polaris sportsman it will start and idol just fine but when you get the throttle over a fourth open it cuts out pops and will not open all the way open could sombody give me some ideas on what could be wrong with it
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post #29 of 118 (permalink) Old 06-06-2011, 12:47 PM
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Sounds like main jet either clover dirty or the wrong size
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post #30 of 118 (permalink) Old 06-12-2011, 04:04 AM
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Quote:
Originally Posted by Manaen View Post
Default carb setting


1) jet sizes need to be looked up on a machine by machine basis
2) Idle mixture screw- in general 1 1/2 turns out will get you close to stock
3) Needle - normally these all come from the factory with the clip in the middle position
4) float arm - should be set parallel to the carb body when held upside down and resting static on the float needle
5) throttle cable - should have 1/4" of free play (I like mine a little tighter than this)
6) choke cable - 1/8" of play
pilot jet is not just idle it supplys fuel from idle to 1/4 throttle
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