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07-03-2009, 10:25 PM
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#1 (permalink)
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Ready, and waiting!
Join Date: Apr 2009
Location: The SOO Michigan
Posts: 48
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Low compression, good running?
Well I just rebuilt my zl after getting it with a blown engine(jan of this year). The strange thing is Im getting 95 on both cylinders and it runs great. My question is there any way to improve compression? Or should I just leave it since it runs good? I appreciate the help.
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Official yooper
2002 ZL 500 (apv)
91 jag afs 440
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07-03-2009, 11:45 PM
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#2 (permalink)
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TRH- Troll Raising Hell
Join Date: Mar 2007
Location: MN
Posts: 2,848
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It will prob. increase as you run it, breaking it in more.
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05/29/84-11/25/07-RIP- Sarah Louise Beard
I'd rather be judged by 12 than carried by 6...
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07-04-2009, 08:16 AM
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#3 (permalink)
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I am Spartacus
Join Date: Feb 2004
Location: Milton Mills, NH
Posts: 17,647
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Tried a different tester yet? Could be the tester itself.
__________________
1992 Ski Doo Mach 1 (SC-10/2 suspended) March '07 SF.com Sled of the Month!
1993 Ski Doo Mach Z 780 triple
1999 Yamaha Venture 500 touring
2001 Ski Doo Mini Z
Assistant Trailmaster Evergreen Valley Snowmobile Club
SledNH.com Moderator
If I'm not home, CHECK THE TRAILS!
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07-05-2009, 01:35 AM
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#4 (permalink)
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Ready, and waiting!
Join Date: Apr 2009
Location: The SOO Michigan
Posts: 48
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Quote:
Originally Posted by smallengineguy
Tried a different tester yet? Could be the tester itself.
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I've thought about that when I get another tester I'll check over it.
__________________
Official yooper
2002 ZL 500 (apv)
91 jag afs 440
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07-05-2009, 09:49 AM
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#5 (permalink)
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PR (polaris rider)
Join Date: Oct 2008
Location: Michigan
Posts: 1,398
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When your doing the compression test, are you holding throttle wide open?
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1999 AC zl 500, 3k miles2003 polaris classic 340  1200 miles-2003 polaris indy xc 500 1500 miles-2000 polaris xc 700 6500 miles-2003 arctic cat zl 600 1500 miles
"Dont let fear and common sense stand in your way!"
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07-06-2009, 07:14 AM
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#6 (permalink)
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Super Moderator
Join Date: Dec 2006
Location: Northern IL
Posts: 6,220
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Sounds like that may be the issue! closed would read bout that and WOT should be bout 125-130! Yes there are lots of things that can and perhaps should have been done with that motor? How many miles? Why did it go down? Did you replace the seals? Did you atleast cut the transfere ports? Did you radious the ports? PM me and I'll go threw what all can be done! I was hoping to have a porting seminar, but I lost my roof on my shop to a tornado a coupla weeks ago!!!
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07-06-2009, 11:14 AM
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#7 (permalink)
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PR (polaris rider)
Join Date: Oct 2008
Location: Michigan
Posts: 1,398
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Quote:
Originally Posted by kccats
I lost my roof on my shop to a tornado a coupla weeks ago!!!
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Thats no good KC, sorry to hear it.. everything working out for you now?
__________________
1999 AC zl 500, 3k miles2003 polaris classic 340 1200 miles-2003 polaris indy xc 500 1500 miles-2000 polaris xc 700 6500 miles-2003 arctic cat zl 600 1500 miles
"Dont let fear and common sense stand in your way!"
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07-06-2009, 04:48 PM
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#8 (permalink)
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Ready, and waiting!
Join Date: Apr 2009
Location: The SOO Michigan
Posts: 48
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Well I replaced all the upper end seals, it overheated it started at 15 f and ended at 45 f the trails were mud( the guy I bought it from did this) it had 6k miles on it.
__________________
Official yooper
2002 ZL 500 (apv)
91 jag afs 440
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07-07-2009, 11:30 AM
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#9 (permalink)
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Registered User
Join Date: May 2009
Location: mn
Posts: 360
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Quote:
Originally Posted by kccats
I lost my roof on my shop to a tornado a coupla weeks ago!!!
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that sucks! 
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2006 edge touring 600 for sale p.m me if interested!
2003 classic touring 500
2001 xc sp 500 mine 
Polaris kid for life
SUMMER SUCKS!
for sale
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07-07-2009, 12:30 PM
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#10 (permalink)
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PR (polaris rider)
Join Date: Oct 2008
Location: Michigan
Posts: 1,398
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Quote:
Originally Posted by Empire087
Well I replaced all the upper end seals, it overheated it started at 15 f and ended at 45 f the trails were mud( the guy I bought it from did this) it had 6k miles on it.
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Do the comp. test at WOT, stud
__________________
1999 AC zl 500, 3k miles2003 polaris classic 340 1200 miles-2003 polaris indy xc 500 1500 miles-2000 polaris xc 700 6500 miles-2003 arctic cat zl 600 1500 miles
"Dont let fear and common sense stand in your way!"
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07-07-2009, 02:02 PM
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#11 (permalink)
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I am Spartacus
Join Date: Feb 2004
Location: Milton Mills, NH
Posts: 17,647
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You'd know if the compression was low by it being hard to start, no power, etc.
__________________
1992 Ski Doo Mach 1 (SC-10/2 suspended) March '07 SF.com Sled of the Month!
1993 Ski Doo Mach Z 780 triple
1999 Yamaha Venture 500 touring
2001 Ski Doo Mini Z
Assistant Trailmaster Evergreen Valley Snowmobile Club
SledNH.com Moderator
If I'm not home, CHECK THE TRAILS!
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07-07-2009, 04:35 PM
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#12 (permalink)
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Ready, and waiting!
Join Date: Apr 2009
Location: The SOO Michigan
Posts: 48
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See that's what's weird, it's easy to start runs amazingly.
__________________
Official yooper
2002 ZL 500 (apv)
91 jag afs 440
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07-07-2009, 05:55 PM
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#13 (permalink)
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Super Moderator
Join Date: Feb 2005
Location: Groton NY
Posts: 14,474
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Then your meter is either no good, or you did not test correctly.
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07-07-2009, 09:30 PM
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#14 (permalink)
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Ready, and waiting!
Join Date: Apr 2009
Location: The SOO Michigan
Posts: 48
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I'm gonna say that my tester is going.
__________________
Official yooper
2002 ZL 500 (apv)
91 jag afs 440
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