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post #1 of 13 (permalink) Old 01-23-2013, 11:26 AM Thread Starter
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99 INDY 500 Farts?

Hi just looking for a little help.. as stated 99 Indy 500 900 miles on sled.. well maintained Ive been riding it for a few season with no complaints. the past two trips cold starts fine, but put about 15 miles or so on it then shut it down for a quick break. starts one pull then is very bogie for a few seconds till its gets high RPM's... then as i ride for the first 3/4 of a mile every time i let off the gas a little it "farts" or slight backfire. i can feel it in my thumb on the gas. ride it WOT for a few seconds and seams to go away.. no loss of power but now its doing it every time i stop and start or stop and let it idle for a few min again.. any thoughts as to where to look... its cold here and have to work on it outside...?? its got fresh high octain gas ran some seafoam in first tank of season.. always ran good...im confused
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post #2 of 13 (permalink) Old 01-23-2013, 01:21 PM
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plugs look ok? maybe starting to show early fouling signs? i had similar problem and i thought the plugs looked good enough but it slowly got a bit worse each time. throw a set of new plugs in and try that. be sure to properly gap them too! no such thing as a 'pre gapped plug' out of box!
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post #3 of 13 (permalink) Old 01-23-2013, 01:29 PM Thread Starter
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plugs new this season and look good.. not wet and tanish brown in color..?? whats the gap anyway? might try that...
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post #4 of 13 (permalink) Old 01-23-2013, 01:48 PM
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not sure for your model. under hood is a sticker with all that info. trow new plugs in it anyway and just try it. cheap fix and if it doesnt fix it you spent $6 on new plugs. no biggie
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post #5 of 13 (permalink) Old 01-23-2013, 01:50 PM
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0.028.

Also, check that the chokes are functioning properly and seating when closed.

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post #6 of 13 (permalink) Old 01-23-2013, 02:28 PM Thread Starter
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wouldn't imagine the chokes causing that issue..?? but i guess it would be carb side seeing as i can feel the "pop" in the throttle...i guess im having a look at them.. sucks cause it like minus 10.F here...its too god*** cold to start fiddling with small parts..lol
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post #7 of 13 (permalink) Old 01-23-2013, 02:40 PM
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99 INDY 500 Farts?

Backfire happens when fuel goes thru the cylinder without being burned. It gathers in the hot pipeand when it gets hot enough to burn it 'pops' and that what is called backfire. Thus back fire is cause by overfueling, likley caused by stuck open chokes or choke plungers not seating.

Trust me. Check your chokes. This has happened to me cause i over looked the chokes as an overfueling problem before and i worked on that dang thing for hours all for nothing, because I over looked the chokes


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post #8 of 13 (permalink) Old 01-23-2013, 04:47 PM Thread Starter
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Great.. any suggestions for an easy fix...don't feel like removing air boxes and carbs.. i'm wondering if i can take a look at the chokes without removing.. just trying to picture it in my head.. sled is located elsewhere.. thanks for all the help..
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post #9 of 13 (permalink) Old 01-23-2013, 07:00 PM
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Quote:
Originally Posted by INDY114 View Post
Great.. any suggestions for an easy fix...don't feel like removing air boxes and carbs.. i'm wondering if i can take a look at the chokes without removing..
Yep. Buy and new one and leave yours out where ever it broke down.

If your gonna have an old sled (like me) be prepard to remove the air box and wrench on the carbs a bit. In fact get used to it.

Last I checked (last night haha) Small Polaris 550 or 600 is between $6-8K and the top of the line sled will be close to $15K out the door!
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post #10 of 13 (permalink) Old 01-23-2013, 07:11 PM Thread Starter
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haha..real funny...but i do agree.. the only problem is that the sled is like brand new.. 815 miles mint mint condition.. not even a scratch...its good enough for the riding we do... i have other issues that requires my money..like the new addition on my house..
thanks for the help tho...
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post #11 of 13 (permalink) Old 01-23-2013, 07:23 PM
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Re: 99 INDY 500 Farts?

You can get the choke plungers out without removing the carbs, but if they are sticking I would recommend doing a thorough cleaning anyway. It's not likely they would be giving you problems while all other passages in their are fine.
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post #12 of 13 (permalink) Old 01-23-2013, 07:31 PM
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no shop - so sled sits outside year round, 1999 model - that means 14 years old, engine backfires, sway bar fell off

I am sorry but that is not the definition of 'like brand new or mint condition'. 800 miles doesnt really mean that much - except to a wrecker. sorry to burst your bubble
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post #13 of 13 (permalink) Old 01-23-2013, 08:04 PM Thread Starter
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wow ringneck.. while i do appreaceat your help, maybe i was miss leading. i have a garage at home but at camp both sleds sit in a inclosed Triton trailer that is weather and mouse tight. both sleds are well taken care of and summerized every year. sway bar was my fault due to a frozen heim joint that broke last season because i overlooked it under the skid plate. so the bushing fell out on the one mile tow back to camp.. but thanks for your help..
99 indy 500
04 700 xc
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