This is especially true for skis that have been sitting for over 30 days.
Whenever running a ski that wasn’t out yesterday for a few hours, it is advised to check the spark plugs before running it for an extended period of time.
My suggestion, and what I do, is to start the ski and run it wide open for 1 solid minute, and then pull the kill lanyard while still holding the throttle wide open.
NOTE – the plug on the right is on the edge of being too lean (and hurting the motor) – it is not getting sufficient fuel and/or oil – the plug on the left is way too lean, and is causing engine damage (the grey color on the tip is dust from parts inside the motor disintegrating)
Pull the spark plugs and compare them. They should have a brown or black coating on them. But more importantly, they should all look the same.
If one is different (clean, white, etc.) then put the ski back on the trailer and do something to the carbs (rebuild, clean, re-adjust) prior to running it again.
