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indy 500 carb jetting
- motor bogs out at lower end speeds
started by 99polarisindy500
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May 6th 2009 at 3:45 PM
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99polarisindy500
Starting Member
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11 Posts
Group: Members
Member Since: February 19th 2009
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i have a 1999 polaris indy 500, are the stock main jets for mikuni carbs 350's? my sled does not run well on trails at lower rpms and speeds, i have cleaned the carbs, put new needles and seats in and changed the cdi box but to no avail has any of this helped, would changing the main jet to a 340 or 330 help or be too much? sry to anyone if i am asking dumb questions this is my first attempt on rebuilding this sled which was in bad shape when i started
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Site Supporter
Group: Site Supporters
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May 6th 2009 at 6:03 PM
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feebles
Junior Member
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163 Posts 
Group: Members
Member Since: January 2nd 2007
Location: butternut, wisconsin, USA
Current Sled: 1979 yamaha exciter
2008-2009 Miles: like 10
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what your compression?
'93 buick... 1000w 15" pyle,
1600 watt pyle amp,
rockford fosgate ported box, 2 8" jensen mids.
pioneer cd player
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May 7th 2009 at 1:51 AM
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99polarisindy500
Starting Member
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11 Posts
Group: Members
Member Since: February 19th 2009
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Quote originally posted by feebles
what your compression?
i havent checked the compression yet on it, although it has new pistons,rings and gaskets in it.when its running at faster rpms and speeds it runs awesome,just on the low end it does this, i am in the process of getting a compression tester to see.
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May 7th 2009 at 2:13 AM
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proxsledhead
if it aint broke dont fix it!
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221 Posts
Group: Members
Member Since: October 25th 2008
Location: Kotzebue, Alaska, USA
Current Sled: MXZX 440 soon to be 700
2008-2009 Miles: 1865
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sounds like its running rich, try going one size down from the ones that are in it right now, if that doesnt help go another, then another. It might seem like alot of work but its better than guessing, thats how i got my sled dialed in
FreeWill, Freeride, Freestyle
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May 7th 2009 at 8:03 AM
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99polarisindy500
Starting Member
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11 Posts
Group: Members
Member Since: February 19th 2009
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Quote originally posted by proxsledhead
sounds like its running rich, try going one size down from the ones that are in it right now, if that doesnt help go another, then another. It might seem like alot of work but its better than guessing, thats how i got my sled dialed in
thanks alot for your help its much appreciated, i will let you all know how i make out
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May 7th 2009 at 8:19 AM
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THE_Norwegian
:)
THE_Norwegian got some SLP powder pro skis in the mail today :-D.
Updated Friday at 5:32 PM
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446 Posts
Group: Members
Member Since: January 29th 2008
Location: Norway
Current Sled: ET 340 and XCR 440
2008-2009 Miles: 2500KM :-D
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are the clutches good ? if the rollers are bad it will bog allot...
* XCR 440 *
"I`m not picking my nose.. I´m porting my head!"
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May 7th 2009 at 8:33 AM
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bobp53916
Looking for Sno Pro motor mounts
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890 Posts 
Group: Members
Member Since: December 14th 2008
Location: Gwinner ND/Waupun WI
Current Sled: 99 ZR600/2000 Sno Pro
2008-2009 Miles: 500+
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What do the plugs look like?
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May 7th 2009 at 6:01 PM
[ Modified May 7th 2009 at 6:03 PM
]
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99polarisindy500
Starting Member
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11 Posts
Group: Members
Member Since: February 19th 2009
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the plugs are usually black and soaked when it fouls out on low end, and i am in the process of ordering a new clutch for it
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May 7th 2009 at 11:31 PM
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BskidooC
Senior Member
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2209 Posts 
Group: Members
Member Since: January 31st 2006
Location: leadville, Colorado, USA
Current Sled: 07 Summit XRS 800
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Black is rich, if they are soaked you are floading...I would buy some jets and slowly work it down leaner
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May 8th 2009 at 6:41 AM
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99polarisindy500
Starting Member
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11 Posts
Group: Members
Member Since: February 19th 2009
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ok thanks, much appreciated
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May 16th 2009 at 7:58 AM
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polariskid37
Junior Member
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130 Posts
Group: Members
Member Since: March 23rd 2005
Location: Sylvania, OH, USA
Current Sled: 2001 Polaris XCSP 800
2008-2009 Miles: 1800
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play with your air screw next time you go out and hit the trails. before you lean out the bottom end (counterclockwise) i would actually richen it because it sounds to me like it may be a lean bog.
2001 Polaris XCSP 800
2003 Polaris XC 500
2002 Polaris Classic 500
1996 Polaris XLT
Yes its fast......No, you can't ride it!
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August 3rd 2009 at 2:52 PM
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theword
Junior Member
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134 Posts
Group: Members
Member Since: December 8th 2007
Location: Spring Lake Park, MN, USA
Current Sled: 1996 Polaris Ultra SKS
2008-2009 Miles: 425
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make sure that you have the right fuel to oil mixture. I have been working with the oil issue with my aunt's sled. Just make sure that you talk to someone at a shop that knows what they are doing and then make the right adjustments to your oil pump to make it right. This will help your sled run better. The other thing is that if you don't change the main jets on the carbs and move the needle jet clip up one slot this will lean out the mid range. The main jets only change the WOT NOT THE MID RANGE. Well I hope that your sled will run better for you.
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August 3rd 2009 at 9:02 PM
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I would say clean and rebuild your clutches put on a new belt and it will run like a champ.
Riley
PJH Racing
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August 26th 2009 at 6:57 PM
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i agree with riley, have seen it with them 500's i had one and finally figured out it was in the cluthing
Error: Gallery file 51690 doesn't exist!
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August 27th 2009 at 12:05 PM
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Offshore24
Dismember
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4604 Posts 
Group: Moderators
Member Since: November 30th 2002
Location: NOYDB, Confusion, Azerbaijan
Current Sled: 05' Gade
2008-2009 Miles: 2999
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If it bogs in the low end it's not your main jets. Throttle position - 0 to 1/4 idle jet and air screw adjustments; 1/4 to 3/4 needle jet (you said you have new needles); 3/4 to WFO main jets. So baseline your air screw ( I think it's lightly seated and back out 1.5 turns) and if you floats aren't sticking and your carbs are clean you should see an improvement in the low end.
On a 99 they came with 350 main jets, 45 pilot jet, 6F9-3 Jet Needle, 2.5 cutaway, .75 air screw, 1600 idle rpm +/- 200.
I jetted down to 330 mains successfully and dropped the needle one ring. No problems with temps down to 0F
2005 Ski-Doo MXZ Renegade 600 SDI
Save your breath, you'll need it to blow up your date.
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September 30th 2009 at 9:21 PM
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99polarisindy500
Starting Member
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11 Posts
Group: Members
Member Since: February 19th 2009
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thanks to everyone with your replies, i have since went down one jet size and had the air screws adjusted, also put a brand new comet 108 exp clutch on it, hopefully this will cure my issues, it does start much easier and the plugs are burning brown now, just waiting now for that first snow to give it a real test, but thanks again to all of you who replied
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