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Cleanfire 800 motors
- Blowing up!!!
started by brian1983
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April 5th 2009 at 10:21 PM
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brian1983
Junior Member
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102 Posts 
Group: Members
Member Since: April 17th 2006
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I own a D8 with 1800 miles on it and its still running good when it's map issues aren't acting up... Have been feeling some hesitation when i get into the gas even after the reflash intermittently.When i feel the motor running out of the norm...i back off. My question is..... when the 800's are blowin up...... when does it happen?? Wide open throttle? High rpms? Cause a lean motor thats Wot or high rpms is gonna blow no matter how high quality or low quality the pistons are.... So is it cheap pistons or lean running engines thats causing these things to blow?? Any input would be great....thanks guys....pray for a fix!!!
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April 5th 2009 at 10:23 PM
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barney
Junior Member
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205 Posts
Group: Members
Member Since: November 23rd 2008
Current Sled: 2004 Arctic Cat F7
2008-2009 Miles: 2153
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Quote originally posted by brian1983
I own a D8 with 1800 miles on it and its still running good when it's map issues aren't acting up... Have been feeling some hesitation when i get into the gas even after the reflash intermittently.When i feel the motor running out of the norm...i back off. My question is..... when the 800's are blowin up...... when does it happen?? Wide open throttle? High rpms? Cause a lean motor thats Wot or high rpms is gonna blow no matter how high quality or low quality the pistons are.... So is it cheap pistons or lean running engines thats causing these things to blow?? Any input would be great....thanks guys....pray for a fix!!!
It is a combination of cheap pistons and the map issues.
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April 5th 2009 at 10:27 PM
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brian1983
Junior Member
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102 Posts
Group: Members
Member Since: April 17th 2006
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any aftermarket setups available yet? nice wiseco set? big bore?
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April 5th 2009 at 10:33 PM
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Hughes_097
Average Member
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581 Posts 
Group: Members
Member Since: October 10th 2008
Location: Poland, New York, USA
Current Sled: 06 Rev Adrenaline
2008-2009 Miles: 648
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i've been told by numorous dealers that its the low octaine levels in the gas which is the start of the problem. i know it sounds silly but with the new addition of ethenal being added to our gas its makes the sled run totally different from when the motor was designed. it was design for gas only no with the addition of eathenol. so what they have been doing is putting thicker rings in the piston and decreasing the compression and that has seemed to taken care of the problem. im not saying thats why the cfi motors keep blowing up its just what i've been told be numorous dealers that there is something in the ethanol that is breaking down the motors if that helps you in any way with your question there is my guess
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April 5th 2009 at 10:43 PM
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dtmmil
Senior Member
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3180 Posts 
Group: Members
Member Since: January 27th 2007
Location: Hawley, MN, USA
Current Sled: 99 xc700
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Good point, except you will get way to many people now that will say that ethanol has nothing to do with it, haha.
Clutched
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April 5th 2009 at 10:55 PM
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brian1983
Junior Member
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102 Posts
Group: Members
Member Since: April 17th 2006
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thanks for your input guys!!! Are the 2010's gonna be the same or has there been any changes as far as engine designs or new ecu maps?
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April 6th 2009 at 5:19 PM
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BurnDownAlley
Starting Member
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2 Posts
Group: Members
Member Since: March 22nd 2009
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my sled blew with almost 1200 miles, my friend has a D8, but in the short track with probably close to 3000 on it and he hasnt had a problem. He however played around with the fuel mapping and i didnt. I dont know if you can lay all the blame on the new gas i mean if its been treated or you dont let it sit around to long there shouldnt be any problems. who knows, my sled is ready and i will be picking it up in the morning so we'll see what the problem is, seems to change every time i talk to them.
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April 6th 2009 at 9:13 PM
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brian1983
Junior Member
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102 Posts
Group: Members
Member Since: April 17th 2006
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Quote originally posted by BurnDownAlley
my sled blew with almost 1200 miles, my friend has a D8, but in the short track with probably close to 3000 on it and he hasnt had a problem. He however played around with the fuel mapping and i didnt. I dont know if you can lay all the blame on the new gas i mean if its been treated or you dont let it sit around to long there shouldnt be any problems. who knows, my sled is ready and i will be picking it up in the morning so we'll see what the problem is, seems to change every time i talk to them.
good luck 
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April 6th 2009 at 9:34 PM
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polaris91
117 racing
polaris91 ugh.
Updated Tuesday at 8:30 PM
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3646 Posts
Group: Members
Member Since: March 9th 2006
Location: bridgeport, new york, USA
Current Sled: 1991 indymod/2005 xcsp600
2008-2009 Miles: 2900
2009-2010 Miles: grass!?
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they normaly blow when riding in mid range for a while and polaris is supposeably comeing out with a fix soon
1990 indy trail bored.20over, ported and polished, cluched and geared, chaincase/brakes/jackshaft from 93 xlt, headlight cover, teather, some custom painting, black skid plate, blue running board trim, fox shocks, blue/gray powermadd handguards, 2 in powermadd riser, fly bars/barpad,blue leds(underglow),1 in lug track, teather mount from a 96xcr440,blue guage bulbs, blue c&as, xtra 10 rear, and edge seat and tank.
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April 7th 2009 at 6:59 AM
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FUSION900PA
Average Member
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942 Posts
Group: Members
Member Since: October 20th 2005
Location: Edinburg, PA, USA
Current Sled: SNOW CHECK 09 D8 SP
2008-2009 Miles: 1100
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The lean condition is actucally in the midrange and not at wot. At wot, the sled is pretty rich but the 5000 to about 6500 rpm range is deadly lean which at this rpm range most of your cruising is done.
I've had a power commander III since the sled had around 150 miles and i was able to cover up the mid range and lean out the top end. It was an animal once the PC III was installed; however At 1066 miles my mag side piston is showing slight scoring.
"If you ain't first, you're last" Ricky Bobby
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April 7th 2009 at 11:08 PM
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2strokes_are_awsome
Junior Member
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242 Posts
Group: Members
Member Since: March 5th 2007
Location: Sabin, MN, USA
Current Sled: RMK
2008-2009 Miles: 700ish
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From what i've read on snowest the midrange is lean and the top end is fat. If you run wide open (where it should be most of the time anyway ) you shouldn't have a problem. bad gas can be an impornant factor too.
As for reliability, if it has tits, tires or burns gas, you're going to run into problems.....sooner or later.
There's no replacement for displacement!
Stock = Boring
My ride: a well massaged 2000 RMK sleeper
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April 8th 2009 at 7:21 AM
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white lightning
"The AFTERBURNER"
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608 Posts
Group: Members
Member Since: July 23rd 2003
Location: New York, USA
Current Sled: '01 XCR800
2008-2009 Miles: 400miles
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I blew my '00 XCR in the middle of the winter with midrange and I wasnt pushing it at full throttle - maybe 3/4 way and poofed. Smoked the middle cylinder piston. Piston wash on the other two, were great - no idea why the middle was first to go so I am assuming bad gas, low octane ethanol when it was supposed to be high octane. Who knows. I know a guy who fixes sleds, said to me that he has seen alot of blown up sleds dued to not high enough jettings and using ethanol. BTW, I did up size a jet in my sled at the start of season to avoid that problem. Im stumped. WL
My neighbor used to say, " The speed that thrills, the speed that kills "
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April 8th 2009 at 8:43 AM
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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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Here in Minnesota we've been running 10 percent ethanol in our unleaded for 20 years now. We went through this leaner fuel thing at that time. We can still get non ethanol in the premium, so what I do is make sure I'm running non ethanol when its colder and if its mild I know its O.K. to run the E-10.
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April 8th 2009 at 1:42 PM
[ Modified April 8th 2009 at 1:44 PM
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Quote originally posted by brian1983 any aftermarket setups available yet? nice wiseco set? big bore? Carls makes some really really nice big bores if you want to spend some coin. Wiseco is working on pistons, but no body has anything available yet for the 800 CFI. But they are working on it. Quote originally posted by 2strokes_are_awsome From what i've read on snowest the midrange is lean and the top end is fat. If you run wide open (where it should be most of the time anyway ) you shouldn't have a problem. bad gas can be an impornant factor too. The motor as stated is lean in the mid range, and rich on top end. But the lean midrange is not the only thing causing them to burn down. There are sleds that lean out when in a climb, with half a tank of gas or less, causing burn downs, there are motors going down from faulty ECUs, and there are more things, but the main problem is the lean midrange. If you want your motor to last, stay out of the midrange, but that will not keep your motor from scoring. After mine went the first time I really made sure so stay out of the midrange, turns out it blew at WOT 153 miles later. It could be that it got some damage before that, then when it was running WOT it couldn't hold up to the rpm because the damage was already done. I don't know. But it blew at WOT. So don't think that if you hold it WOT you will be ok. That is not the case. If your riding season is almost over, don't buy anything to try and fix the problems. Polaris says they are coming out with a fix for these motors, and are saying it will work. So just hold on and wait till the fix is released. Polaris says they will take care of all 800 owners.
08 800 Dragon 155
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"DUDE TRUST ME I AM NOT THINKING ABOUT BUYING ONE OF THE DISGUSTING VOMIT CYCLES OF PUTRID DEATH STENCH OF DOOM".
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April 8th 2009 at 5:20 PM
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Switchback700
Volunteer
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21 Posts
Group: Members
Member Since: April 13th 2008
Location: Sudbury, Ontario, Canada
Current Sled: 2008 Switchback 700
2008-2009 Miles: 635
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Does anyone know if the 08 700 CFI's are having the same or similar problems as the 800's. 900 miles on my 700 switch and no engine problems yet. Just electrical problems. Had ECU, Stator and Voltage regulator replaced under waranty at about 650 miles.
2008 700 CFI Switchback
2006 Suzuki Vinson 500 4x4 Automatic
1993 Indy 500 Classic
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April 8th 2009 at 6:39 PM
[ Modified April 8th 2009 at 6:39 PM
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Polarisdude1
Junior Member
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160 Posts
Group: Members
Member Since: February 2nd 2008
Location: Portage La Prairie, Manitoba, Canada
Current Sled: 1998 Polaris XC 700
2008-2009 Miles: 1847
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Quote originally posted by Switchback700
Does anyone know if the 08 700 CFI's are having the same or similar problems as the 800's. 900 miles on my 700 switch and no engine problems yet. Just electrical problems. Had ECU, Stator and Voltage regulator replaced under waranty at about 650 miles.
I myself have not heard any of the same problems as the 800's. But i may be wrong!!!
1998 XC 700(220 Jugs)
- V Force 3 reeds
- Mbrp Race Can
- Slp Boost Bottle
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April 9th 2009 at 4:56 PM
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Switchback700
Volunteer
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21 Posts
Group: Members
Member Since: April 13th 2008
Location: Sudbury, Ontario, Canada
Current Sled: 2008 Switchback 700
2008-2009 Miles: 635
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Quote originally posted by Polarisdude1
Quote originally posted by Switchback700
Does anyone know if the 08 700 CFI's are having the same or similar problems as the 800's. 900 miles on my 700 switch and no engine problems yet. Just electrical problems. Had ECU, Stator and Voltage regulator replaced under waranty at about 650 miles.
I myself have not heard any of the same problems as the 800's. But i may be wrong!!!
Thanks for the input. I realize the thread is for 800's but just thought that the similarities in design and problems being encountered may cross over to the 700's.
2008 700 CFI Switchback
2006 Suzuki Vinson 500 4x4 Automatic
1993 Indy 500 Classic
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April 10th 2009 at 2:33 PM
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dgerlach55033
Advanced Member
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1188 Posts 
Group: Members
Member Since: June 24th 2002
Location: hastings, mn, USA
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Quote originally posted by Switchback700
Quote originally posted by Polarisdude1
Quote originally posted by Switchback700
Does anyone know if the 08 700 CFI's are having the same or similar problems as the 800's. 900 miles on my 700 switch and no engine problems yet. Just electrical problems. Had ECU, Stator and Voltage regulator replaced under waranty at about 650 miles.
I myself have not heard any of the same problems as the 800's. But i may be wrong!!!
Thanks for the input. I realize the thread is for 800's but just thought that the similarities in design and problems being encountered may cross over to the 700's.
mine blew at 1950 miles. it was at a strecth of 30 miles going between 65 and 85 mph.
twin cities,mn
06 mxzx renegade 1000
polaris predator
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June 8th 2009 at 7:14 PM
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driftpounder
Canadian Psycho
driftpounder can already hear the BBBBRRRRRAAAAAPPPPP! of the MBRP.
Updated Monday at 3:23 PM
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1500 Posts
Group: Members
Member Since: April 26th 2006
Location: Porcupine Plain/Saskatoon, Saskatchewan, Canada
Current Sled: 2006 Compfusion
2008-2009 Miles: 502
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Quote originally posted by Switchback700
Quote originally posted by Polarisdude1
Quote originally posted by Switchback700
Does anyone know if the 08 700 CFI's are having the same or similar problems as the 800's. 900 miles on my 700 switch and no engine problems yet. Just electrical problems. Had ECU, Stator and Voltage regulator replaced under waranty at about 650 miles.
I myself have not heard any of the same problems as the 800's. But i may be wrong!!!
Thanks for the input. I realize the thread is for 800's but just thought that the similarities in design and problems being encountered may cross over to the 700's.
Some of the 700 and 600 CFI's have experienced similar problems to the 800, like the hesitation when you get on the throttle, but as for the burn downs they haven't had any that do the same thing as the 8.
'06 Fusion 700 0 miles just bought it
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