I recently posted a topic on my 130 hp johnson, and I appreciated the responses, and to answere your reply's, the compression was 134 , 134, 135,and #4 was 134 the first time around in october , after i first started having problems while on the calusahatchi river..while running at 45mph sustained speed for 25-40 minutes, all of a sudden heavy shaking of the motor and loss of speed but not losing complete power.. Now try and accelerate and it would shake.. Ok I told you the compression after the trip. Now when I continue to get back I took it to the mechanic and he changes the power pack, I take it out and I have a piston out. Ok , the motor is now re- bored 30,000 over , all four are bored, new pistons and rings , water pump, spark plugs, rectifier, and the oil injection has been disengaged and I am now putting the oil right in the fuel now. Ok , now I am going to break my motor in and I ran out 90% of my fuel on my first trip, It ran great , I stay at or around 35 mph. It time to head in and I am about 2 miles away from the ramp, and it does it again, I am doin 35 mph and it starts to shake and lose excelleration but not lose power, I try to throttle forward , but the more you go forward with the throttle the more it shakes. I try this a couple times and all of a sudden , after about 4 unsuccessful try's it acts as if nothing is wrong.. I am worried this shake is the piston. I don't know.. I am taking the gas tank out tommorrow, and inspect the inside.. One of you had said it would be a good idea to replace the carb, the rebuild was already done , but my mechanic said my carb was in great shape.... Thanks for the help guys..Jimmy