98 big boss 500 - Polaris ATV Forum
ATV Repair and Maintenance Having problems? Doing a rebuild? All Repair/Maintenance Discussions here.

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post #1 of 31 (permalink) Old 02-26-2012, 01:44 PM Thread Starter
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98 big boss 500

Im working on a friends 1998 big boss 500 6X6 and it has been sitting for a few years ran very rough when first started cleaned carb and jet cleaned fuel tank checked spark checked ETC after installing carb it idles very smooth but when you get to about 1/2 throttle it starts like chokeing itself out any help would be appreciated polaris ran fine when it was parked
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post #2 of 31 (permalink) Old 02-26-2012, 01:56 PM
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post #3 of 31 (permalink) Old 02-26-2012, 04:12 PM
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did you clean the pilot jet and the main jet, pilot is small jet in hole in center of carb, has vry small hole in it that gets [plugged , almost need a real small wire to get it clean then carb cleaner and compressed air.
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post #4 of 31 (permalink) Old 02-26-2012, 04:30 PM
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If it's a CV carb the diaphram could be bad. The part that controls the carb from off idle upwards.
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post #5 of 31 (permalink) Old 02-27-2012, 05:23 PM Thread Starter
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thanks for the tip is there anything else that you can think of it does have the rubber diaphram in the top of the carb cant see anything wrong no pin holes or tears anymore help would be great would the rpm limiter have anything to do with it
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post #6 of 31 (permalink) Old 02-27-2012, 05:35 PM
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Quote:
Originally Posted by Russ C View Post
did you clean the pilot jet and the main jet, pilot is small jet in hole in center of carb, has vry small hole in it that gets [plugged , almost need a real small wire to get it clean then carb cleaner and compressed air.
I agree. Problem will be the pilot jet plugged or float needle worn.
Are you sure it ran fine before? If it wasn't running fine before look at the camshaft. Is the airbox fully assembled and no air leaks. Clean air filter?
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post #7 of 31 (permalink) Old 03-02-2012, 03:43 PM Thread Starter
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thanks for the ideas but nothing has worked yet when it was parked about 3 years ago it ran fine he tryed to start it this year and it would not start he had no spark new magneto and it started it ran really crapppy then died having old gas in figured that was the problem dumped tank tore carb. off cleaned new gas it runs and idles incredibly smooth but past 1/2 throttle it sounds like its hitting the governor any more help or ideas would be great
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post #8 of 31 (permalink) Old 03-02-2012, 10:14 PM
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Is the slide in the right way? Is it moving as you throttle up? I still think its the diaphram. While its running try and lift the slide a little with a screw driver.

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post #9 of 31 (permalink) Old 03-03-2012, 03:36 AM
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will it smooth out if you push the override button?,you said you checked etc? did you adjust it so there is only 1/8 inch of slack in cable at thumb throttle?
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post #10 of 31 (permalink) Old 03-03-2012, 12:13 PM Thread Starter
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i tryed plushing the override button and still the same in F N R all the same results and yes the throttle cable was adjusted to 1/8"
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