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08-19-2003, 10:39 PM
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#1
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Senior Member
Join Date: Sep 2001
Location: Wisconsin
Posts: 508
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Just checked compression with a Taiwan made compression tester. 105 exactly on both cylinders. Good or Bad?
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08-20-2003, 05:24 AM
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#2
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Senior Member
Join Date: Jan 2003
Location: Wisconsin
Primary Sled: 2006 Crossfire 700
Where I sled: WI/MI
Posts: 1,030
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105 would be pretty weak. Did you hold the throttle open, and pull it over 4 or 5 times? If so, I would first check it with another gauge to make sure. How many miles on this engine?
__________________
Far better it is to dare mighty things, to win glorious triumphs, even though checkered by failure, than to take rank with those poor spirits who neither enjoy much nor suffer much, because they live in the gray twilight that knows not victory nor defeat.
-Theodore Roosevelt
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08-20-2003, 08:46 AM
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#3
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Senior Member
Join Date: Sep 2001
Location: Wisconsin
Posts: 508
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I didn't hold the throttle open. about 2400 miles since last rebuild.
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08-20-2003, 03:11 PM
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#4
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Senior Member
Join Date: Apr 2003
Location: Blairmorganville, Saskatchewan
Where I sled: Around town and Christopher / Emma Lakes
Posts: 978
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If you don't know what it read with the same guage after the last rebuild, then this new number does not mean too much. Does it start easy and run good? Both being the same is more important than the actual number, so if it starts and runs good then it probably is good. Make sure you hold the throttle wide open and give it five good pulls when you check it again.
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08-21-2003, 06:43 PM
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#5
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Senior Member
Join Date: Aug 2001
Location: minnesota new prague prior lake area
Where I sled: southern minnesota last couple of years mostly in the UP because they have had snow
Posts: 442
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on my newly rebuilt 580 i have 125-130 psi on both cylinders but all compression testers are a little different just as long as they are both equal on the guage you should be good to go
__________________
Tom
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08-21-2003, 07:33 PM
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#6
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Senior Member
Join Date: Sep 2001
Location: Wisconsin
Posts: 508
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Get this, borrowed buddies Craftsman (made in the USA) compression tester, 122psi both cylinders. I should have learned by now to not buy foreign tools. JUNK!!! Needless to say i'm not going to bother opening the motor on this sled.
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08-21-2003, 09:43 PM
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#7
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Senior Member
Join Date: Nov 2002
Location: Fredericton (freddy) New Brunswick Canada
Primary Sled: 2004 f6 efi
Where I sled: New Brunswick
Posts: 4,733
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i had the exact sled about 5 yrs ago. i siezed it one cold morning driving about 60 mph. sat along the trial for about 30 minutes. gave her a crank didnt the thing start right up. couldnt believe it. drove it home, checked the compression and one side was down a bit but not anof to worry about. sorry but i cant remember what the compression was. for peace of mind i took the heads off and checked the pistons. one had stuck but not enought o hurt it. i drove it one more season that way. i think i put at least 3000 miles on it after it was siezed and it worked as good as it ever did.
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08-22-2003, 04:29 AM
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#8
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Senior Member
Join Date: Jan 2003
Location: Wisconsin
Primary Sled: 2006 Crossfire 700
Where I sled: WI/MI
Posts: 1,030
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Quote:
Originally posted by zr580s rule@Aug 21 2003, 04:43 PM
but all compression testers are a little different just as long as they are both equal on the guage you should be good to go
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This is not necessarily true. If compression reads different on each cylinder, this would usually indicate damage on one cylinder, but compression can be down on both cylinders an equal amount, due to wear. The variance between the two is only one thing to consider, it also matters what the peak reading actually is.
__________________
Far better it is to dare mighty things, to win glorious triumphs, even though checkered by failure, than to take rank with those poor spirits who neither enjoy much nor suffer much, because they live in the gray twilight that knows not victory nor defeat.
-Theodore Roosevelt
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