What usually can cause you to lose all the compression in top cylinder after just running on water ?<br />Can it be related to bearings going out/ or a pre existing knock noise from either the reed or not good lubrication through the tube to the crankshaft?<br />Its and older 4 cyl 85hp ser#3743683 and I had just had it serviced 2 times -one for rebuild carbs the other set timing,resynk and adjust carbs, replace carbon part in dist/new plug wires<br />Adjust on water.It sounded like a reed could have been going bad or the lower bearing noise when listening with stthescope-they said.<br />Im fed up with it all .The mechanic said it was possible that a plasitic ice bag may have gotten trapped in the prop that can cause overheat..<br />I dont know what to believe now..<br />Can you ever soak it down to free the piston (like in some autos)or is there no chance of reviving it?<br />Any feedback is appreciated cause I am at a loss for boats! 
