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With a warm engine, plugs out, hold the throttle wide open and pull until the needle on your gauge won't go higher.. usually 4-5 pulls. If your tester has a longer hose, it may take a bit more pulls as you have to compress the air in the hose as well. (short hoses are more accurate). If you test cold, the compression will be a little higher, as the cold oil on the cylinder walls creates a better seal between the rings and the cylinder...
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2007 RMK 700 155", 2008 RMK 600 155", 2006 RMK 600 144", 98 Indy 440, 95 Prowler 550 2-up, 1990 Indy 650
RIP, destroyed by fire 1-22-2008 
04 RMK 800, 05 RMK 600, 02 RMK 800, 97 RMK 700
http://www.avalanche.org/accidents.php
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Linear Mode
