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1999 Polaris 600 XC cylinders
started by The_Hunter
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October 10th 2009 at 3:48 PM
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The_Hunter
Starting Member
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19 Posts
Group: Members
Member Since: March 22nd 2009
Location: Manitoba, Canada
Current Sled: 1999 Indy 600 XCSP
2008-2009 Miles: 1000
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What is the purpose of the hole drilled from the inside of the exhaust port to the combustion chamber about 1/2 inch from the top. This is on a non-ves big block 600 liberty engine. It seems to me that it reduce the compression ratio and reduce power.
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Site Supporter
Group: Site Supporters
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October 10th 2009 at 4:19 PM
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The_Hunter
Starting Member
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19 Posts
Group: Members
Member Since: March 22nd 2009
Location: Manitoba, Canada
Current Sled: 1999 Indy 600 XCSP
2008-2009 Miles: 1000
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 1999 600 Liberty cylinder
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October 10th 2009 at 5:05 PM
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xcr440
Sundowners Trail Coordinator
xcr440 is going to be in the garage peeling red stripes off the 440.
Updated Yesterday at 6:40 PM
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12600 Posts 
Group: Members
Member Since: February 1st 2003
Location: St.Germain/Edgerton, Wisconsin, USA
Current Sled: 03prox700/97xcr440
2008-2009 Miles: 610
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decompression hole.
a good beer drinker isnt a picky beer drinker
Loggers.... Working their ass off so you can wipe yours!
"Steep ground is when your cutting a notch and notice a mountain goat looking at you like you are crazy." - Hexan
woodbooga: (WOOD-boog-ah), n. regional dialect, common to areas of New Hampshire and Maine including the towns of Ossipee, Alton, Farmington, Acton, and Lebanon; one who attempts to obtain free firewood to fuel woodburning appliances in an effort to mitigate expenses related to home heating with fossil fuels. Frequently used as a term of derision by non-woodburners who mock the presence of loose bark and other wood waste in the beds of their pickup trucks.
2003 Pro x 700 almond/blue,10-66 black/red team 719 T-flow, 440 mains
1997 xcr440 my clutch kit, 380 mains,T-flow
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October 10th 2009 at 6:12 PM
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The_Hunter
Starting Member
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19 Posts
Group: Members
Member Since: March 22nd 2009
Location: Manitoba, Canada
Current Sled: 1999 Indy 600 XCSP
2008-2009 Miles: 1000
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Is it a good idea to plug that? Will it give more power up top? The same year 700 does not have that decomp hole.
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October 10th 2009 at 6:23 PM
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xcr440
Sundowners Trail Coordinator
xcr440 is going to be in the garage peeling red stripes off the 440.
Updated Yesterday at 6:40 PM
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12600 Posts
Group: Members
Member Since: February 1st 2003
Location: St.Germain/Edgerton, Wisconsin, USA
Current Sled: 03prox700/97xcr440
2008-2009 Miles: 610
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might give it a bit more. I was told that it effected nothing while running. I have heard of guys puting hex screws with loctite in them.
a good beer drinker isnt a picky beer drinker
Loggers.... Working their ass off so you can wipe yours!
"Steep ground is when your cutting a notch and notice a mountain goat looking at you like you are crazy." - Hexan
woodbooga: (WOOD-boog-ah), n. regional dialect, common to areas of New Hampshire and Maine including the towns of Ossipee, Alton, Farmington, Acton, and Lebanon; one who attempts to obtain free firewood to fuel woodburning appliances in an effort to mitigate expenses related to home heating with fossil fuels. Frequently used as a term of derision by non-woodburners who mock the presence of loose bark and other wood waste in the beds of their pickup trucks.
2003 Pro x 700 almond/blue,10-66 black/red team 719 T-flow, 440 mains
1997 xcr440 my clutch kit, 380 mains,T-flow
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October 11th 2009 at 10:40 AM
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westman995
Advanced Member
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1927 Posts 
Group: Members
Member Since: February 22nd 2008
Location: St. James, Minnesota, USA
Current Sled: 98 rmk 600 - zx mod
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I saw that pic and was like, what the hell.. Haha.. Cuz its my pic im pretty sure. And no, i do not mind you using it for reference i was just wondering when i saw it on the first page.
It is a decompression hole. I didnt know at first either, and i had asked about it. Also, i was told it could gain a few HP if you it were plugged. Its just to make it easier for starting the sled. Also i know the same year 700 doesnt have the hole either cuz my 98 xc 700 didnt have them either. And also, that is a 1998 rmk 600 cylinder, not a 99. Not that it makes a difference i guess.
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October 11th 2009 at 12:41 PM
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powersledder
PSI Powered
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3606 Posts
Group: Members
Member Since: September 1st 2006
Location: Houghton, MI, USA
Current Sled: 07 IQr
2008-2009 Miles: No Speedo
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Its a decompression hole polaris added to make the engine easier to turn over on cold mornings. Many shops will weld over them and then re-nic the cylinder. I don't see any real gain on a 600, especially if it doesn't have any other aftermarket parts.
I also would not suggest putting a hex screw into it, even with loctite. Can you imagine what would happen if it ever loosened and made its way into the cylinder? Not good.
Polaris 800HO monoblock cylinder for sale PM me with offers
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October 11th 2009 at 1:52 PM
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The_Hunter
Starting Member
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19 Posts
Group: Members
Member Since: March 22nd 2009
Location: Manitoba, Canada
Current Sled: 1999 Indy 600 XCSP
2008-2009 Miles: 1000
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Quote originally posted by westman995
I saw that pic and was like, what the hell.. Haha.. Cuz its my pic im pretty sure. And no, i do not mind you using it for reference i was just wondering when i saw it on the first page. Yup, I'm sure it is your pic, found it via google lol
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