yeah im not sure if its a mix of rust and sand.. but i picked up the boat this spring and put 70hrs on her this summer and she never skipped a beat.. untill my last time out i had 2 big puffs of blueish/white smoke at 2 different start ups.. thats when i noticed oil puking from pulley side of the compressor.. iam very surprised she ran as good as it did with the condition the tracker valve was in.. cold starts she would spit and sputter but would clear its self out once warmed up a bit..