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my sled still runs weird at idle
- i hit the choke it starts reving to 3k
started by indysledder
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February 19th 2009 at 6:48 AM
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indysledder
New Member
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58 Posts 
Group: Members
Member Since: January 8th 2008
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When I hit the choke it revs up to 3k rpms, I brought it to my mechanic and he says it could be internal troubles. Both cylinders had 130psi last I checked, but i also put my uni sych carb tool on there and the clutch side wasnt getting any reading while the pto side got a good reading on the meter. I put my hand over the clutch side carb when its running and it revs up to 3k again. I am thinking maybe something on that clutch side cylinder is wrong? Could the rings be shot or maybe that side of the crank? just had both crank seals replaced and it isn't leaking anywhere according to my mechanic. (hes really good too, will do simple things free and only charged me 55 bucks to replace the crank seals) I'm about ready to tear the thing apart again.
But otherwise the thing runs good when i open it up.
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February 19th 2009 at 8:12 AM
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dtmmil
Senior Member
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3182 Posts 
Group: Members
Member Since: January 27th 2007
Location: Hawley, MN, USA
Current Sled: 99 xc700
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Sounds like you need to clean the carbs to me, and sync them.
Clutched
Jetted, boyesen reed petals, boost bottle, 98xc carbs slides, 1371 needles, gutted air box
Homeade 7 1/2" riser
Homeade suspension drop brackets
shortened and blackened windshield
powermadd handguards
144 conversion, tracks usa extensions, custom tunnel extension and rear bumper, IQ flap, 1.25" track
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February 19th 2009 at 8:44 AM
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EarnhardtNorth
Junior Member
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167 Posts 
Group: Members
Member Since: June 13th 2007
Location: Ontario, Canada
Current Sled: 1995 STORM
2008-2009 Miles: at a time
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I agree with dtmmil, I would take the carbs apart and look closely at the pto side and see what's going on in there. When you put your hand over the carb (reducing air flow and getting closer to the proper air/fuel mixture) and the idle increases that sounds like an under fuel problem to me . Maybe the pilot jet is plugged? The pilot jet is used at idle and up to about 1/4 throttle. Which lines up with pulling the choke on, adding fuel gives you the same end result. The idle could just be set too high. Get both carbs responding the same (same air flow through each one), then set the idle.Maybe check the carb boots for cracks or leaks. What sled is this on?
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February 19th 2009 at 9:05 AM
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Jenkins
Starting Member
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12 Posts
Group: Members
Member Since: February 17th 2009
Current Sled: 1980 Polaris TX 340 F/A
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Check your intake for signs of wear or cracking. This will allow too much air in and rev your motor.
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February 19th 2009 at 11:42 AM
[ Modified February 19th 2009 at 11:51 AM
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indysledder
New Member
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58 Posts
Group: Members
Member Since: January 8th 2008
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its not dirty carbs. mechanic checked all that after i checked it more then once already. the intakes are cracked but its not sucking air in i sprayed them with carb cleaner and pushed it all around and nothing, no revving up at all. and I really dont want to replace them until i figure out what is wrong with it. I switched around the carbs as well and put my hand over the clutch side again and it made no difference still reved up to 3k. And I did try and synch the carbs. Its something to do with the clutch side cylinder, rings have 4k miles on them and am wondering if it would do this not making the seal.
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February 19th 2009 at 11:53 AM
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dtmmil
Senior Member
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3182 Posts
Group: Members
Member Since: January 27th 2007
Location: Hawley, MN, USA
Current Sled: 99 xc700
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Well, if you have good compression, and spark, it has to be the carb/carbs. Are they synced? You could have a pilot jet plugged, or a pilot circuit plugged, it doesn't take much. With the airbox off, look at the carb slides, are they sitting the same height? When you squeeze the throttle, do they start moving at the same time? And when you pull it full throttle, are they fully opening up the same? What sled is it?
Clutched
Jetted, boyesen reed petals, boost bottle, 98xc carbs slides, 1371 needles, gutted air box
Homeade 7 1/2" riser
Homeade suspension drop brackets
shortened and blackened windshield
powermadd handguards
144 conversion, tracks usa extensions, custom tunnel extension and rear bumper, IQ flap, 1.25" track
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February 19th 2009 at 1:19 PM
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indysledder
New Member
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58 Posts
Group: Members
Member Since: January 8th 2008
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Quote originally posted by dtmmil
Well, if you have good compression, and spark, it has to be the carb/carbs. Are they synced? You could have a pilot jet plugged, or a pilot circuit plugged, it doesn't take much. With the airbox off, look at the carb slides, are they sitting the same height? When you squeeze the throttle, do they start moving at the same time? And when you pull it full throttle, are they fully opening up the same? What sled is it?
Its an 89 indy trail, and I even put newer carbs on and it doest do anything, Its not the pilots they are brand new, even with the new carbs on and synched it still does the same things.I even had an authorized polaris mechanic take the carbs apart and tell me chances are its not the carbs its something internal. And thats as far as I let him go with it.
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February 19th 2009 at 1:22 PM
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dtmmil
Senior Member
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3182 Posts
Group: Members
Member Since: January 27th 2007
Location: Hawley, MN, USA
Current Sled: 99 xc700
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Well then you better check the compression again!
Clutched
Jetted, boyesen reed petals, boost bottle, 98xc carbs slides, 1371 needles, gutted air box
Homeade 7 1/2" riser
Homeade suspension drop brackets
shortened and blackened windshield
powermadd handguards
144 conversion, tracks usa extensions, custom tunnel extension and rear bumper, IQ flap, 1.25" track
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February 19th 2009 at 2:43 PM
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700RMK136
Drift Digger
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128 Posts
Group: Members
Member Since: February 9th 2007
Location: Willmar, MN, USA
Current Sled: 2002 RMK 700 136
2008-2009 Miles: 315 :(
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You say you are not getting a reading off the uni-sych on the clutch side. when you put your hand over it does it have any vacuum? if not there is something wrong inside the engine. take a new compression test, pull off the carb and look at the piston skirts. you can also pull the exhaust side and look at the skirt on that side.
2002 RMK 700
3" Riser
94 XLT 2" paddles
8,000 miles and going strong
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February 19th 2009 at 4:01 PM
[ Modified February 19th 2009 at 4:02 PM
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indysledder
New Member
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58 Posts
Group: Members
Member Since: January 8th 2008
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Quote originally posted by 700RMK136 You say you are not getting a reading off the uni-sych on the clutch side. when you put your hand over it does it have any vacuum? if not there is something wrong inside the engine. take a new compression test, pull off the carb and look at the piston skirts. you can also pull the exhaust side and look at the skirt on that side. Well its still both at 120 PSI, i pulled both plugs and held the throttle wide open and gave it a good 5 pulls on both sides. Strange thing is when I pulled the plug the clutch side sparkplug was lean, white ashy and the mag side was black. When it had the old carbs on it, it wouldnt idle lower then 2200 RPMs without dieing, thats when the uni synch gauge wasnt getting any reading on the clutch side, but when i put the carbs from my wrecked 95 xlt sp (changed jets and all that) it would idle down and i'd get a reading from the uni synch but it was very boggy at no to 1/4 throttle. But it Still did the same thing, hit the choke it sounds like it starves for gas and revs up to 3k then stays there till i kill it, choking it doesnt stall it out like it normally would unless i leave it on for half a minute or so. forgot to also mention it still revs up when i put my hand over the clutch side carb..and it doesnt feel like too much of a vacuum on it.
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February 19th 2009 at 4:10 PM
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bushwacker
Junior Member
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347 Posts
Group: Members
Member Since: January 2nd 2008
Location: Deer River, Mn, USA
Current Sled: 2000 XC 700 SP
2008-2009 Miles: 600
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Sounds to me like the carb boots are cracked or loose or possibly leeking base gasket.
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February 20th 2009 at 8:47 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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Quote originally posted by indysledder
its not dirty carbs. mechanic checked all that after i checked it more then once already. the intakes are cracked but its not sucking air in i sprayed them with carb cleaner and pushed it all around and nothing, no revving up at all. and I really dont want to replace them until i figure out what is wrong with it. I switched around the carbs as well and put my hand over the clutch side again and it made no difference still reved up to 3k. And I did try and synch the carbs. Its something to do with the clutch side cylinder, rings have 4k miles on them and am wondering if it would do this not making the seal.
Well The issue when you have a bad rings you will not have any power. When it happens the fuel that is burned buy passes the rings and go's to the crank case. Then it comes back in to the combustion chamber at this point you will notice a issue with running. Now with the issue of it in creasing to 3k when you chock it that sounds like the carbs are making the motor starve for fuel. When you put on the choke the motor should dog down and die because you are having fuel issues to the motor. The only thing that I can think of when you are having that issue is that you are getting the right fuel to the pto side and then the motor is running right. I would take a look at the fuel line and the fuel pump. Some where you are having an issue with the fuel coming to the carb on that side of the motor. Make sure that your fuel pump is working right and that there is no fuel leaking out any where. I hope that this will help you out.
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February 22nd 2009 at 7:25 AM
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indysledder
New Member
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58 Posts
Group: Members
Member Since: January 8th 2008
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Quote originally posted by theword
Quote originally posted by indysledder
its not dirty carbs. mechanic checked all that after i checked it more then once already. the intakes are cracked but its not sucking air in i sprayed them with carb cleaner and pushed it all around and nothing, no revving up at all. and I really dont want to replace them until i figure out what is wrong with it. I switched around the carbs as well and put my hand over the clutch side again and it made no difference still reved up to 3k. And I did try and synch the carbs. Its something to do with the clutch side cylinder, rings have 4k miles on them and am wondering if it would do this not making the seal.
Well The issue when you have a bad rings you will not have any power. When it happens the fuel that is burned buy passes the rings and go's to the crank case. Then it comes back in to the combustion chamber at this point you will notice a issue with running. Now with the issue of it in creasing to 3k when you chock it that sounds like the carbs are making the motor starve for fuel. When you put on the choke the motor should dog down and die because you are having fuel issues to the motor. The only thing that I can think of when you are having that issue is that you are getting the right fuel to the pto side and then the motor is running right. I would take a look at the fuel line and the fuel pump. Some where you are having an issue with the fuel coming to the carb on that side of the motor. Make sure that your fuel pump is working right and that there is no fuel leaking out any where. I hope that this will help you out.
It's definitely not losing any power, when I get it moving it goes from 1/4 throttle up its fine no problems. The lines that connect to the carb seemed a little lose and when i squeezed the gas line before it would go into the carb, gas would leak out around the tubing. But I put one of those hose clamps you pinch with a pair of pliers on there right on the bubble of the inlet to the carb. Maybe another one of those connections is leaking in some air or something. I replaced all the gas line from inside the tank right up to the carbs as well as the crank case line to the fuel pump. Otherwise I dont smell gas at all.
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February 22nd 2009 at 7:38 AM
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snowolf
Average Member
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514 Posts 
Group: Members
Member Since: January 23rd 2006
Location: buchanan, mi, USA
Current Sled: 04 f6 red 97 ultra spx se
2008-2009 Miles: 840
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better check the crankseal really good. i have burnt down 2 sleds over the yrs from bad crank seals. spray some WD40 down near cltuch side seal when its running. if it changes rpm, the seal is done........
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February 22nd 2009 at 10:06 AM
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indysledder
New Member
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58 Posts
Group: Members
Member Since: January 8th 2008
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Quote originally posted by snowolf
better check the crankseal really good. i have burnt down 2 sleds over the yrs from bad crank seals. spray some WD40 down near cltuch side seal when its running. if it changes rpm, the seal is done........
Thanks for the idea, But I beat ya to it already! had both the PTO and Clutch side crank seals replaced just like a week ago. and I am almst positive the base gasket is ok too i sprayed the crap out of it with ether and notta
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February 23rd 2009 at 8:49 AM
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indysledder
New Member
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58 Posts
Group: Members
Member Since: January 8th 2008
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Quote originally posted by theword
Well The issue when you have a bad rings you will not have any power. When it happens the fuel that is burned buy passes the rings and go's to the crank case. Then it comes back in to the combustion chamber at this point you will notice a issue with running. Now with the issue of it in creasing to 3k when you chock it that sounds like the carbs are making the motor starve for fuel. When you put on the choke the motor should dog down and die because you are having fuel issues to the motor. The only thing that I can think of when you are having that issue is that you are getting the right fuel to the pto side and then the motor is running right. I would take a look at the fuel line and the fuel pump. Some where you are having an issue with the fuel coming to the carb on that side of the motor. Make sure that your fuel pump is working right and that there is no fuel leaking out any where. I hope that this will help you out.
I checked the fuel pump and when I pulled the line off the carb, pulled the engine over a bunch of times it wouldn't even gurgle out of the gas line, not a single drop of gas came out but I could see the gas moving up and down inside the line a little bit. I've heard its supposed to spray a little bit out of the line. If thats the case I think my fuel pump is shot?
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