Engine compression numbers? - Polaris ATV Forum
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post #1 of 9 (permalink) Old 03-15-2012, 08:44 PM Thread Starter
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Engine compression numbers?

Still trying to resolve my overheating and coolant over flow issue. I have tested several things and even though Im not seeing wet on the plug or coolant coming out of the exhaust I still think I may still have a gasket leak. But dont want to rip it completely apart to check for it. LOL

I have a friend who is gonna let me borrow a compression gauge/tool to check my cylinder pressure.
I just dont know what a good number will be.
I assume I will need to know what numbers are good at different levels of throttle. Idle, etc...
Thanks

1999 Polaris Sportsman 500

Aftermarket Accessaries:
Vision 161 Bruiser Alloy Wheels
2" SuperATV Alloy Wheel Spacers
Kenda Executioner Tires 25x10x12
2" SuperATV Lift Kit
Tusk Heavy Duty Springs (4)
3000 lbs Superwinch with Remote Control (front)
1500 lbs Superwinch on Reese Hitch mounting plate (rear as needed)
Moose Plow
Kimpex ATV Front Box w/ Gull-Wing Doors
Kolpin Polaris Convertible Rear Drop Rack (icefishing only)
Koplin Gun Boot and mount (Hunting only)

Homemade Accessaries:
3 Headlight Mod
Removed sway bar
Reese Hitch style bumpers (front and rear)
Automobile style bumper hitch rack 18"x36"
Reese Hitch style Winch mounting plate
Reese Hitch style mounting for 50 Cal Ammo can storage
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post #2 of 9 (permalink) Old 03-15-2012, 08:49 PM
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You don't check compression with the engine running. The spark plug comes out and the end of the tester goes into the spark plug hole. Then you turn it over and watch the gauge.

2002 Sportsman 500 HO
Warn 25XT + Bumper
25" Grim Reapers
GoldFinger left hand throttle
and other stuff...
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post #3 of 9 (permalink) Old 03-15-2012, 11:57 PM Thread Starter
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Ok thank you.
My friend explained this too.
But he wasnt sure what reading would be normal compression for my 500.

1999 Polaris Sportsman 500

Aftermarket Accessaries:
Vision 161 Bruiser Alloy Wheels
2" SuperATV Alloy Wheel Spacers
Kenda Executioner Tires 25x10x12
2" SuperATV Lift Kit
Tusk Heavy Duty Springs (4)
3000 lbs Superwinch with Remote Control (front)
1500 lbs Superwinch on Reese Hitch mounting plate (rear as needed)
Moose Plow
Kimpex ATV Front Box w/ Gull-Wing Doors
Kolpin Polaris Convertible Rear Drop Rack (icefishing only)
Koplin Gun Boot and mount (Hunting only)

Homemade Accessaries:
3 Headlight Mod
Removed sway bar
Reese Hitch style bumpers (front and rear)
Automobile style bumper hitch rack 18"x36"
Reese Hitch style Winch mounting plate
Reese Hitch style mounting for 50 Cal Ammo can storage
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post #4 of 9 (permalink) Old 03-16-2012, 04:09 AM
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you probably wont find a bad head gasket with a compression test, need to do a leak down test ,if its building pressure in the cooling system its about gotta be a head gasket
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post #5 of 9 (permalink) Old 03-16-2012, 11:41 AM
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Could possibly be a base gasket also!

'96 Xplorer 300 Aftermarket CDI box, K&N filter, jet kit, reworked expansion chamber from dirt bike, 1" taller + 1" wider rear tires, dual wenches, Rack on rear/w cargo pac, polaris box on front, Mossy Oak cover on seat, back-up lights on rear, aux. power source for GPS,"Theft deturent's", hand protectors, new clutch springs coming! Would love to find GURU style bumpers! By the way, I'm also a graduate of AMI with over 20 years of motorcycle mechanical experiance. New to quads, but the same basic engines. 2 stroke or 4 stroke!
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post #6 of 9 (permalink) Old 03-16-2012, 06:48 PM Thread Starter
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Oh dont tell me that!

1999 Polaris Sportsman 500

Aftermarket Accessaries:
Vision 161 Bruiser Alloy Wheels
2" SuperATV Alloy Wheel Spacers
Kenda Executioner Tires 25x10x12
2" SuperATV Lift Kit
Tusk Heavy Duty Springs (4)
3000 lbs Superwinch with Remote Control (front)
1500 lbs Superwinch on Reese Hitch mounting plate (rear as needed)
Moose Plow
Kimpex ATV Front Box w/ Gull-Wing Doors
Kolpin Polaris Convertible Rear Drop Rack (icefishing only)
Koplin Gun Boot and mount (Hunting only)

Homemade Accessaries:
3 Headlight Mod
Removed sway bar
Reese Hitch style bumpers (front and rear)
Automobile style bumper hitch rack 18"x36"
Reese Hitch style Winch mounting plate
Reese Hitch style mounting for 50 Cal Ammo can storage
VTgamezombie is offline  
post #7 of 9 (permalink) Old 03-16-2012, 07:23 PM
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This is what you need to test for a blown head gasket/cracked head or block, where it leaks into the exhaust. NAPA AUTO PARTS

"Big Bad Wolf" 2004 Sportsman 700 EFI, Mine
"Lil' Red" 1999 Sportsman 335, The Wife's Ride
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post #8 of 9 (permalink) Old 03-16-2012, 09:39 PM Thread Starter
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Quote:
Originally Posted by fishhooker View Post
This is what you need to test for a blown head gasket/cracked head or block, where it leaks into the exhaust. NAPA AUTO PARTS
Thank you sir.
Its on my shopping list.

1999 Polaris Sportsman 500

Aftermarket Accessaries:
Vision 161 Bruiser Alloy Wheels
2" SuperATV Alloy Wheel Spacers
Kenda Executioner Tires 25x10x12
2" SuperATV Lift Kit
Tusk Heavy Duty Springs (4)
3000 lbs Superwinch with Remote Control (front)
1500 lbs Superwinch on Reese Hitch mounting plate (rear as needed)
Moose Plow
Kimpex ATV Front Box w/ Gull-Wing Doors
Kolpin Polaris Convertible Rear Drop Rack (icefishing only)
Koplin Gun Boot and mount (Hunting only)

Homemade Accessaries:
3 Headlight Mod
Removed sway bar
Reese Hitch style bumpers (front and rear)
Automobile style bumper hitch rack 18"x36"
Reese Hitch style Winch mounting plate
Reese Hitch style mounting for 50 Cal Ammo can storage
VTgamezombie is offline  
post #9 of 9 (permalink) Old 03-17-2012, 03:03 AM
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It'll be the head gasket. The real question is if there has been enough leakage of coolant back into the cylinder while it was sitting around to have done any damage to the cylinder walls. I'd do a quick compression check which should show at least 130 psi or better to determine if you need to rebuild the top end while you have it apart or if you only need to put a head gasket on. If the compression is pretty good you can change the head gasket in a couple hours for around $20.
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