good evening fellas,<br />my wife and i were out the other day fishing. we "trolled" for about 8 hrs. and never really got on the gas and throttled. at the end of the day, i heard a knocking noise that wasn't there before. we proceeded into the marina at a higher speed as it was getting dark. when we got to the marina, the noise was gone. the motor that we are talking about is is a 1989 johnson 110 with the vro disconnected mixed precisely at 50:1. lost sleep all the night wondering what it could be. did a compression check today, came out as follows: 90lbs. 91lbs. 90.5lbs. and 92lbs. from what i've read everyone seems to have 115 to 130lbs. is there a chance that i should get another gauge and recheck it?? went to lake again today, boat ran awesome, idles perfect, runs as if nothing ever happened. i grounded my buzzer wires from the head, the warning system seems to be working. nothing gets hot. when i first heard the knocking noise, i pulled the cowl and everything was fine, cool to the touch. what i'm asking here is: could the boat have been "loaded" up from running low speeds all day?????? and also does 90 lbs. sound too low for compression? thanks for reading my post and any input would be great. j.w.