Just purchase used boat and took to mechanic to check everything out. He brought it back the other day and I have been having problems. Have been having problems. Mechanic told me to check the feul filter after him noticing while out running that the filter was clogged with alot of stuff, of course he ran it for awhile like this so who knows if this could do damage. Was told to buy seafoam and put in feul tank and to also check the feul filter to see if any particles are in it. Well I opened up the Top COver to the motor and there is alot of saw dust there, can the saw dust go down into lower unit and cause problems. One problem was that when i got it back to test out I would here a loud thump sound coming from the motor, sounded like i hit a log or something or something in the bottom of boat in back. This happend several times after speeding up and then once when slowed down to idle it immediatly made the two loud thumps and died. He came back an drove it for a long time and it only happened once to him, he came back and said it was probably the gear and adjusted it. So this morning I took it out to see how it would run then the motor started make a rattle sound while going slow, so i came back in. Then this afternoon I start the motor and now it is rattling in back an forth in idle, then making the thump sounds in idle and then I started to drive it and this time the thump sounds were more frequent and one time the thump was so hard that the whole boat shook. That was enough for me and I did not even make it out of my cove. It seems like the adjustment he made to the gear made the motor much worse and at least before it was only thumping here and there, could this be what is going on or could it be something else?
Motor is a 85HP Force/chryler i think 1989
Motor is a 85HP Force/chryler i think 1989