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Powder Problem
started by johntschofen
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February 21st 2007 at 4:30 PM
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johntschofen
Starting Member
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24 Posts
Group: Members
Member Since: July 30th 2006
Location: Yellowknife, NT, Canada
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'03 700 SKS; When I ride in powder and snow comes up over the hood, the engine suffers considerable power loss, runs roughly and dies at idle throttle. The problem eventually clears up if I keep riding (out of the powder) or if I put the sled in a heated garage for a bit. My sled has the screen kit and I do close the two screens that can be opened and closed but that still leaves lots of places for the snow to get in. So what's the deal? Is it just a matter of sealing things up? I heard all the vents can be blocked safely except one (the one above the brake). Is this true? Any insight, tips, suggestions would be greatly appreciated. Thanks.
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February 21st 2007 at 5:00 PM
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Boss302man
Average Member
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695 Posts 
Group: Members
Member Since: January 23rd 2006
Location: Da UP ehh??, Michigan
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Does your sled have powder prefilters on both sides of the hood where the intake foam is? I had to put them on my sled. I think polaris didnt start putting them on from the factory untill 04. Tey are just a super fine almost silky fabric that goes over your intake foam inside the cowl. It repels water and snow but flows air freely. Closing the vents is mostly to keep the powder off of the pipe. A cold pipe will cause the engine to load up. the other vents dont really need to be closed.
2001.5 700 XC/SP
1988 Indy 400
I like engines n stuff
Anyone can go out and carve around but its the in the woods going uphill, on one ski zigzagin with a leg up in the air givin it all the yank you got just so you can clear the tree beside you knowing your only chance is to stay balls out that parts the men from the groomer chasers.
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February 21st 2007 at 7:20 PM
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jasonmc98
New Member
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59 Posts 
Group: Members
Member Since: January 15th 2007
Location: Dexter, MI, USA
Current Sled: 2001 XCR 800
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I'm very interested in hearing peoples reaction to this one, I have an 01 XCR 800 with the same problem, it acts like its on the verge of fouling a plug, Its done this since it was brand new, I've tried a bunch of stuff like making plates that block off all of the vents but that just made the sled run hotter and didn't solve anything, I was wondering if this was an exhaust back pressure problem? I do have the SLP nylon prefilter and it doesn't help, although its easier to clean the powder off of the filter.
Ride Naked, Show the world yer NUTZ
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February 21st 2007 at 8:29 PM
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johntschofen
Starting Member
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24 Posts
Group: Members
Member Since: July 30th 2006
Location: Yellowknife, NT, Canada
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I just have the stock intake foam on either side of the bars. Could there really be THAT much snow getting in through there? What kind of prefilters does everyone recommend?
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February 21st 2007 at 8:45 PM
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snowmotion
Starting Member
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3 Posts
Group: Members
Member Since: February 21st 2007
Location: Flushing, Mi, USA
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I am very familiar with this problem. What happens is the air bleeds in the carburetor ice over which causes the engine to injest raw fuel rather than a mixture of air and fuel.
The only solution for the problem that I found was to tape over all of the air vents on the front of the hood. (this can be done on the inside so it looks better. This keeps more heat under the hood and keeps the carbs from icing up. Virtually all liquid cooled sleds have had this issue but some manufacturers put carb heaters on to solve the problem. The vent shutter kits help but are not as effective as taping over the vents.
By the way, once it is iced up you can cure the problem by pouring hot water over the carbs to thaw the ice buildup. Usually if you get some heat built up the situation will clear itself if you let it shut down with something over the hood to keep the heat in.
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February 21st 2007 at 8:58 PM
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MJay
Sledaholic
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6184 Posts 
Group: Members
Member Since: March 16th 2004
Location: Goose Bay, Newfoundland, Canada
Current Sled: 2006 Arctic Cat M7
2008-2009 Miles: 450
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If your out riding hot water isnt always available. This may sound sick and stupid but trying taking a whiz on them. Ive had to do it before after having carbs freeze up. Works like a charm.
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February 21st 2007 at 8:59 PM
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boody1981
Junior Member
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424 Posts 
Group: Members
Member Since: February 6th 2006
Location: The Pas, MB, Canada
Current Sled: 00' XCR 800
2008-2009 Miles: 0 inKuwait
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Sounds like you may be jetted real rich for your area. That or your airbox vents are getting blocked. Carbs may be freezing up.
1995 Indy lite
1996 Indy super sport
1997 Indy 500
1998 Indy 500
1999 Yamaha SRX 600
2000 Polaris XCR 800
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February 21st 2007 at 9:13 PM
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Boss302man
Average Member
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695 Posts
Group: Members
Member Since: January 23rd 2006
Location: Da UP ehh??, Michigan
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Quote Originally posted by johntschofen
I just have the stock intake foam on either side of the bars. Could there really be THAT much snow getting in through there? What kind of prefilters does everyone recommend?
The polaris ones are good.
Mine after i put them on has never got icy carbs and i ride a lot of deep powder. Like snow comming over the hood for a couple hours straight. Also the foam ring that seals your airbox to the hood needs to be there and in good shape. Look at the black plate in your airbox with the boots on it that slide over the carbs. Sometimes on the 800s and the 700s due to more suction this plate will warp leaving a gap around it for snow comming through the vents to get sucked into. Just another thought.
2001.5 700 XC/SP
1988 Indy 400
I like engines n stuff
Anyone can go out and carve around but its the in the woods going uphill, on one ski zigzagin with a leg up in the air givin it all the yank you got just so you can clear the tree beside you knowing your only chance is to stay balls out that parts the men from the groomer chasers.
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February 22nd 2007 at 7:13 AM
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jasonmc98
New Member
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59 Posts
Group: Members
Member Since: January 15th 2007
Location: Dexter, MI, USA
Current Sled: 2001 XCR 800
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I'm not sure that my carbs icing up is my problem, last weekend we were riding on a hard packed trail, sled was running tip-top, jumped into a field with about 3 1/2 foot of powder, rode into it slow as to not get snow up over the hood and as soon as I matted it from a stand still, it started running this way, thats what its always done. After playing around for a bit, jumped back onto hard packed trail and it cleared up instantly. It almost seems as if my exhaust is being blocked by the snow and when I get some clearance between it runs fine, not sure if that makes any scense.
Ride Naked, Show the world yer NUTZ
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February 22nd 2007 at 8:18 AM
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edthesled700
Starting Member
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40 Posts
Group: Members
Member Since: January 4th 2007
Location: Saskatoon, Saskatchewan, Canada
Current Sled: 98 xc 700
2008-2009 Miles: 700
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I have had similar problems with this as well. The only fix for it is to close up all vents possible and make sure there is no powder snow making it into your air box. I am also going to put on k&n air filters and get rid of the big old clumsy air box. I know lots of guys who do mountain riding and all they use are aftermarket air filters. As bossman pointed out the plate in my air box is warped due to suction. Check it out, i'll let you know how the aftermarket air filters work for me.
ride hard or go home!!!
'98 xc 700
v-force 3 reeds
slp power packs
boost bottle
clutched
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February 22nd 2007 at 6:37 PM
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boody1981
Junior Member
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424 Posts
Group: Members
Member Since: February 6th 2006
Location: The Pas, MB, Canada
Current Sled: 00' XCR 800
2008-2009 Miles: 0 inKuwait
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ok my next guess is your VES bellows is blown, check them out. These are something that if they are torn a little they will only affect the sled once in deep snow! had the same problem with mine and faught with it forever before I cured it with a new bellow.
1995 Indy lite
1996 Indy super sport
1997 Indy 500
1998 Indy 500
1999 Yamaha SRX 600
2000 Polaris XCR 800
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February 23rd 2007 at 12:08 PM
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bmunsell
Starting Member
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1 Posts
Group: Members
Member Since: February 23rd 2007
Location: Wasiall, Alaska, USA
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I had same problem on 05 700 RMK. Even just being in the powder a little bit would foul it all up. Fixed it by using duct tape to seal up around plastic pan on the bottom of the headlight and dash housing, on the underside of the cowling.
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February 23rd 2007 at 12:25 PM
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myvertxcape
Bring It, Don't Sing It!
myvertxcape flu sucks azz.
Updated Thursday at 8:00 PM
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2640 Posts
Group: Members
Member Since: July 10th 2005
Location: Kotlik, AK, USA
Current Sled: '07/8 600RMK 144's
2008-2009 Miles: 6200
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Gotta remove the plastic shroud on the inside of your hood that covers the backside of the gauges and headlights and seal it up properly. Powder snow finds it way into your air intake and gets to the carbs and enriches your sled. More foam or duct tape works good.
'08 600RMK 144" 6565 miles
SLP single pipe/can, intake kit, footwell vents, Clutching
my own shockwell intake vent, VMI rack, backrest
'07 600RMK 144" 2725 miles
SLP can, VMI rack! Footwell vents
RAW chassis tunnel bag for sale, fits RMK's and Switchbacks. $80 new, $60 shipped within US(looks like new) http://www.snowmobilefanatics.com/forum/...splay.aspx
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February 23rd 2007 at 3:49 PM
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sledhead_2002
Advanced Member
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1053 Posts 
Group: Members
Member Since: June 28th 2004
Location: Winnipeg, Manitoba, Canada
Current Sled: 02 900 RMK
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Do u play in the pow often?
Is so go SLP big horn kit, and add flow rites, I have 2 2" rounds in dash and also no speedo but a flow rite there too. I also have mesh screen over all my other openings in my hood, onyl tape the very front bottom by hood hinge, air is requried
02 900 RMK 159" 200 hp
98 XC 700 for the little man
Proud member of team SUMMER SUCKS
WINNIPEG MB CANADA
Full time sledaholic
Spending the cash on MOD'S for 09
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