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View Full Version : 2003 kfx 400 compression



weeman69xx303
05-16-2012, 07:13 PM
quad hasnt been running so good so over the winter i had the valves done and now its till not runnin right but it is better. the plug is black so im waiting on the jet kit to come in and i did a compression test dry got 120psi and 150 wet. is this normal? also i didnt do it with the throttle wide open so will this make a huge difference?