rpm

Hello members, Thanks in advance for any advice or input. Mercruiser 7.4 MPI. Full tank of gas ran fine on plane for our first part of our journey. Next stop tank nearing 1/2 full and notice that starboard engine at around 3K RPM starts to lose RPM and notice the engine sputtering and feel the...

Hello, quick question—05’ 28 ft sundancer— I’ll get the boat on plane just fine and about 5 minutes later, the port side engine will drop from 4K rpm (cruising speed) down to 3.5k rpm’s and won’t let me go over that even if I push full throttle, it cuts off at 3.5k. In order to keep the boat on...

Hi everyone. So my 2003 240DA with 5.0MPI went in the water yesterday. She started up and idled fine. Cruised smooth through no wake. But when I opened her up she hit 2500 and would go no further. Right at 2500. Did not seem to bog. Didn’t stutter. Just would not go to higher RPM. No alarm...

Hello group, You have helped me in the past as im a relative novice to boat mechanics so im coming back to the well... I have a 2001 Sea Ray Sunsport 280, twin 350 Mag MPI Mercruiser engines, mechanic maintained, oil change every year etc. So I had it put in on May 7th, drove it about 6...

This is a 280, with twin mercruisers. The port engine is having the problem, the starboard is fine. Here are the symptoms of the port engine: - Starts fine - Running up to 1,500/2,000 rpm, fine - Accelerating to get on plane, around 3K - will run fine for about 20 to 30 seconds - then the RPM...

Set up is 2004 Sundancer 300. Twin 5.0 MPI's, Bravo III outdrives and 22 degree dual props. Boat seems to have a cavitation issue. The boat is under powered in my opinion with the 5.0's and certainly with more than 4 adults, full fuel, etc. Has always had a difficult time getting on plane...

Silly question here, I just replaced my 26p props 3x3 blade props with 24p 4x3 blades. But now I am having major trouble getting on plane and the engine really struggles - I don't even try to go past 2600 rpm as the speed is only 10mph. I'm wondering if the mechanic installed the props...

I have a 99 215 EC with 155 hours. Merc 5.0 with 2bbl Mercarb. Bought as a project 4 yrs ago. Replaced/rebuilt everything in the fuel system 3 yrs ago. New fuel pump, rebuilt carb, removed and cleaned tank, new check valve. Did full tune up 2 yrs ago. Plugs, wires, cap, rotor, timing. Had it in...

Help! I have owned a 1998 Sea Ray 210 Signature Open Bow for about 10 years. Purchased it with 40 hours on it and it now has approximately 600 hours. A couple of years ago it started backfiring periodically under load. The problem has become increasingly worse and is now a problem every...

We’ve been generator challenged this season – first with the generator surging and second that it only runs for a few minutes at a time. The surging was fixed with a complete tear down and ultrasonic cleaning from a local marina – varnish in the jets. When reassembled the idle screw that sets...

I got a 89 Sea Ray 300 Sundancer with 2x 5.7 350. Can anyone tell me the best RPMs for good fuel economy at hull speed and on plane? I read that anything under 1000 rpm is good for slow speed and anything between 2700 and 3000 is best while on plane for this size boat. I am thinking on...

Hello, I've just purchased a 1978 24' Sedanbridge. The motor has been replaced with a 2005 Chevy 350, Edelbrock Manifolds and fresh water cooling. Alpha 1 outdrive was rebuilt. I went out the other day, ran it about 2500-2800 rpm's. This was comfortable, making about 13 knots in rolling seas...

ok – I could use some experienced opinions here… so i took possession of my boat (360) a little over a month ago. on the sea trial everything was fine - we noted a sound around the stbd engine so we did oil samples from the transmission that came back clean. The day I was moving it, the stbd...

I was wondering what the best prop/pitch is for my boat. As of now I am running a 14.5" prop with 19 pitch, and of course i would like more top end, but not sacrificing getting out of the hole. I was wondering what everyone is running at WOT (wide open throttle) with their boats, and what is a...

She`s powered by 2 Volvo penta diesel 147kw/200pk ,gen.Westerbeke diesel Now I have a problem with the gauges they are not working fine,rpm read only after a hard push on the trottle,psi not equel,fuel bad reading ,temp is ok ,is it the connection to the engine or are the gauges broken