Just bought my first boat and owner said it sat for 6 years. its a 2000 mercury 90hp engine outboard. Before selling he took it to a mechanic who cleaned out the carbs and pistons. The mechanic thought he cleaned out the gas tank to empty but accidentally left 10 gallons in there, I filled up the rest so 20 gallons were in the gas tank. there was still 10 gallons with 6 year old gas. I ran the boat for 1 day on the water using my big motor for about 30 minutes before switching to my kicker. I then flushed out the gas and cleaned out the tank and put new gas...
With the OLD GAS at full throttle my RPM's were at 3,200 @ 25 MPH. it would run for about a solid 30 seconds then start dropping to 3,000 and back up to 3,200 RPMs. This would repeat forever untill I drop RPMS a bit to under 3,000 RPMs and the issue stopped.
With the NEW GAS it runs at 4,000 RPMS @ 30 MPH and after about a solid 30 seconds starts doing the same exact issue. Drops to 3,800 or so and back up. It will do this until i drop the speed.
I cannot attach the video but I do not think this is a issue with Old gas causing the CARB to be clogged because Right when i got on the water it started doing it. and if the person cleaned out the carbs or other stuff it wouldnt be consistant. What else can i check without spending hundreds of dollars on a mechanic!
PLEASE HELP!!!
With the OLD GAS at full throttle my RPM's were at 3,200 @ 25 MPH. it would run for about a solid 30 seconds then start dropping to 3,000 and back up to 3,200 RPMs. This would repeat forever untill I drop RPMS a bit to under 3,000 RPMs and the issue stopped.
With the NEW GAS it runs at 4,000 RPMS @ 30 MPH and after about a solid 30 seconds starts doing the same exact issue. Drops to 3,800 or so and back up. It will do this until i drop the speed.
I cannot attach the video but I do not think this is a issue with Old gas causing the CARB to be clogged because Right when i got on the water it started doing it. and if the person cleaned out the carbs or other stuff it wouldnt be consistant. What else can i check without spending hundreds of dollars on a mechanic!
PLEASE HELP!!!