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Higher RPMs
- (How) Should I do this?
started by 488_fan
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May 15th 2009 at 9:37 AM
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488_fan
Starting Member
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3 Posts
Group: Members
Member Since: December 10th 2008
Location: Antigo, WI, USA
Current Sled: 1997 Indy Trail
2008-2009 Miles: 1130
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I have a 1997 Indy trail with a 488 fan. It maxes out at 7000 rpm, and I would like a few more rpms. I have read that this could cause overheating with a fan cooled engine, so would it be safe? I am thinking 7500-8000, and what would i need to do this? How much faster would it go or would it just accelerate faster?
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Site Supporter
Group: Site Supporters
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May 15th 2009 at 9:57 AM
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ridingthe600edge
sleds are all polished up and waiting for snow!!!
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566 Posts 
Group: Members
Member Since: December 12th 2008
Location: Lowell, In
Current Sled: 2001 600 edge/2009 600 IQ
2008-2009 Miles: 1200 done
2009-2010 Miles: 2=yard!
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i would leave the fanny alone. you want more speed and higher rpms go liquid. just my.02 
2001 600 edge X almond spring on primary with 60gm wieghts, s&s rumble pack, gutted air box 6" woodys doolys carbides,196 woodys 1 1/4" studs
2009 600 IQ shift all stock still a virgin!! not for much longer
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May 15th 2009 at 10:03 AM
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tnmemr
Red
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504 Posts
Group: Members
Member Since: November 7th 2006
Location: WI, USA
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Quote originally posted by 488_fan
I have a 1997 Indy trail with a 488 fan. It maxes out at 7000 rpm, and I would like a few more rpms. I have read that this could cause overheating with a fan cooled engine, so would it be safe? I am thinking 7500-8000, and what would i need to do this? How much faster would it go or would it just accelerate faster?
That sled is at max. power at 7000 +/- 200. Increasing the rpms will make you go slower.
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May 15th 2009 at 10:10 AM
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duece
Junior Member
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225 Posts 
Group: Members
Member Since: February 26th 2007
Location: brookfeild, ma, USA
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my last trail 488 lasted me sixteen years and never had the engine apart once and the guy i sold it to has never touched it I would leave it alone and it wont let you down just my .03$
gerald j sullivan
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May 15th 2009 at 11:05 AM
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McGrail.S
Junior Member
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114 Posts
Group: Members
Member Since: February 17th 2009
Location: Sutton, Ontario, Canada
Current Sled: 87' Indy trail 500 144"
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Quote originally posted by duece
my last trail 488 lasted me sixteen years and never had the engine apart once and the guy i sold it to has never touched it I would leave it alone and it wont let you down just my .03$
Mines hit 22 years, still running strong.
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May 15th 2009 at 11:48 AM
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KRSS144
Average Member
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782 Posts
Group: Members
Member Since: July 31st 2007
Location: SPARTA, MI
Current Sled: 2000 XC 600 SP -its stock
2008-2009 Miles: 850
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One of the best engines and will run forever if you leave it alone...oh and to answer your question you can get more rpm's by clutching. I wouldnt do it to that sled. just my 2cents
QUOTE(JeremyZ3 @ Jan 27 2009, 04:38 PM)
F*** YOU ATLEAST I AINT A JEWISH XC JUNK OWNING ASS F***ER
Goodwin Performance clutch kit,Boysen Reeds,1" Track,192 Stud Boys studs,Extra idler wheels,Thunder Products-extra air vents,SLP boost bottle,SLP Airhorn,Walker Evan rear Piggy Back shock,2 SLP Flow Right Intake,Rumble Pack can,PowerMadd 3" pivot riser w/6" riser block,custom made straight bar,PowerMadd handguards,PowerMadd SS extended throttle cable,RSI hand grips and SS brake line,hood vents yellow,Custom seat
04 SXVenom (Little ladies)
99 Banshee
Red Frame,.40 over Vitos Super Stock Piston Kit,Vitos Needles,
T5 pipes/silencers,Tusk nerf bars,K&N Air Filter,22" ITP Mud Lites
14/41 Gearing
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May 15th 2009 at 11:51 AM
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redhot
Junior Member
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137 Posts
Group: Members
Member Since: February 10th 2009
Location: mn
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Face it. If you want to go faster, you'll need a faster sled to begin with...
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May 18th 2009 at 5:05 PM
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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 agree with tnmemr. 7k peak revs is about all you can get with that engine. WL
My neighbor used to say, " The speed that thrills, the speed that kills "
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May 22nd 2009 at 11:33 AM
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488_fan
Starting Member
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3 Posts
Group: Members
Member Since: December 10th 2008
Location: Antigo, WI, USA
Current Sled: 1997 Indy Trail
2008-2009 Miles: 1130
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Ok. Thanks much, guys. If its peaking a 7k, i might as well leave it there. Hopefully it will last as long as some of the other 488s have.
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May 22nd 2009 at 11:41 AM
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tdgbigfoot
Certified sledaholic
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1277 Posts 
Group: Members
Member Since: September 12th 2008
Location: Albany, Vermont, USA
Current Sled: 99 SKS 700, 96 Mach Z 780
2008-2009 Miles: 500
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My 86 is going goods too. They are good engines., but the suspension is not capable of being beaten.
2000 Indy Trail Touring 550, 1999 Indy SKS 700, 1996 Mach Z 780, 1994 Wildcat 700, 1991 Formula Plus, 1990 Safari LX, 1989 Indy 400, 1988 Tundra Skandic, 1987 Citation, 1986 Indy Trail 488, 198? Bravo
1969 Corvette 350
2000 Cheroekee - 4 1/2" lift, & other goodies
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July 11th 2009 at 1:21 AM
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mabeldk4
Starting Member
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12 Posts
Group: Members
Member Since: July 11th 2009
Current Sled: 1991 polaris 500 classic
2008-2009 Miles: 500
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my 89 488 fan peaks at about that. it has so many miles on it and i beat on it so hard yet its still goin strong i wouldnt mess with it at all...
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July 11th 2009 at 10:48 AM
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As said above, reving passed max power point is useless.
You can do some clutching and gearing to make it pull harder up to that point though.
A good set up is everything.
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July 16th 2009 at 11:09 AM
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oldred98
Junior Member
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220 Posts
Group: Members
Member Since: May 20th 2005
Location: Cambridge, Il., USA
Current Sled: 1999 800 XCR
2008-2009 Miles: 250
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Quote originally posted by Student Driver
As said above, reving passed max power point is useless.
You can do some clutching and gearing to make it pull harder up to that point though.
A good set up is everything.
I changed the primary clutch spring to bring the rpm's up to 7700 on my 02 440 Pro-X fan.(similar engine)
It did give it a little more top end, and it feels stronger as well.
I have had no problem with it, and can ride it hard all day without any problems.
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July 16th 2009 at 10:56 PM
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Polaris_Parts_MN
Junior Member
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200 Posts
Group: Members
Member Since: October 8th 2008
Location: NW minneapolis suburbs, Minnesota, USA
Current Sled: 1999 XC 500
2008-2009 Miles: 450
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Quote originally posted by oldred98
Quote originally posted by Student Driver
As said above, reving passed max power point is useless.
You can do some clutching and gearing to make it pull harder up to that point though.
A good set up is everything.
I changed the primary clutch spring to bring the rpm's up to 7700 on my 02 440 Pro-X fan.(similar engine)
It did give it a little more top end, and it feels stronger as well.
I have had no problem with it, and can ride it hard all day without any problems.
totally different engines. your pro-x engine is made for the high revs because its a race sled. and everyone knows the pro-x 440's are fairly notorious for blowing a cylinder. they are not even close to being as reliable as the 488 fans. why do you think those motors have stayed identical from 1985 until Polaris upgraded to the 550 fan in 1999?
the 488 fan is the MOST reliable engine polaris has ever built. and if something does go wrong, they are the easiest to fix
1999 Polaris XC 500
-holeshot skid plate
-fox reservoir front track shock
-fox front shocks
-xenon low-beam bulb (very helpful at night)
Just add gas and snow!
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