Boat motor sputters at full throttle

Then i tried the big 67mm 3 blade gas prop. 57 liter mcm engine mercruiser in a boat.

Some old mercs have a piece of metal below the engine housing in the exhaust channel that can break lose and wedge in the exhaust channel.

Boat motor sputters at full throttle. If the carburetor is clogged or worn it fails to efficiently balance the air and fuel mixture required for your engine to run properly at full throttle. This could cause stalling. Also your carburetor could be all clean but adjusted incorrectly preventing sufficient fuel reach into the engine and thereby causing power loss at full throttle.

If your outboard engine is sputtering at any speed idle or full throttle it could be the result of several common malfunctions. You may need to make a few timing adjustments or replace a spark plug or you may need serious mechanical inquiry. I have a 150 pro series tracker 185hp evinrude outboard on my 1992 Nitro DC bass boat I was on the water the other day and when I gave it full throttle the motor sputtered and died on me.

The motor idles fine still but if I give it sudden acceleration it sputters and dies. To do this what you would do is pump the bulb a bit to prime the engine. Disconnect the fuel line from the low pressure pump.

Get some scrap fuel line and a vacuum gauge and hook it directly to the fuel inlet on the pump. Start the engine up and watch the gauge. The fuel pump should generate 4 to 7 inches of mercury reasonably quickly.

Sputter at full throttle. The symptoms you describe are typical of a reduced fuel flow any one or more of the following could be a cause dirty filter weakening fuel pump restricted hosefittingpickup tube in tank air sucking INTO the hose somewhere. A loose hose clamp or a split or burst hose can also slow water flow and it can spray damaging moisture around the engine.

Regularly service and replace the impeller. Also look at the condition of its housing. Scarring or pitting of the metal housing can cause even a good impeller to lose pumping power.

When I throttle the engine up its spits sputters and shakes. Weve pulled the spark plugs which have been replaced this year and they are black and covered with oil. We have been through the fuel system and there are no leaks.

Weve replaced the fuel filter housing fuel filter and the quick connect to. Brushless motor stutters at full throttle. Prev 1 2 3 Next The problem of having an engine sputter is typically caused by a fuel system issue.

But when fans throttle at full speed bringing it to its limit you may have a problem. What to Do When Your Boat Motor Sputters Should you replace your tired outboard with a newer model or rebuild that boat motor. And more like 10K if purchased from a local full-service dealer.

Rebuilding an older engine of the same size might cost about 35K or so or about a third of the cost of a new engine. That 5K or more. The boats motor will still operate and function as it should but the lack of a connection between the propshaft and propeller blades drastically reduces the boats top speed.

If you believe a spun prop is to blame for your boats inability to produce speed at full throttle you should take it a. When I finished the trailer I took the boat back out and watched the motor as I went to full throttle again to see if it was a one time event. I went to full throttle and trimmed the motor to plane the boat.

As the engine started to bog down I noticed the motor went down by itself and I could not tilt the motor up. Its amazing how often people forget about this vent and it turns out to be closed. Open up the screw and the engine should start running just fine.

If youre on a boat with an installed tank you need to check the tanks vent. Mud wasps are commonly the culprit in this situation. They crawl up the vent build a nest and shut you down.

The high speed circuit and particularly the jets are buried in the bottom of the carb bowl usually. Being there they are most prone to clog from the gunk. Therefore you idle good and the engine falls on its face when you throttle up.

My routine is to check the basics to be sure Im not chasing my tail and then move on to the carbs. Coming out of the hole at full throttle the engine sputters until the boat gets on plane. Eliminate noxious diesel fumes and the frustration of filling up at the pump with the 5KW Brushless Kit featuring a Motenergy brushless motor and a 48V Curtis Controller that can produce up to 5HP continuous and often used to replace 10-15hp combustion.

Some old mercs have a piece of metal below the engine housing in the exhaust channel that can break lose and wedge in the exhaust channel. If this is the problem the only fix is to take the head off and remove the metal. You can run em without the metal.

The sympton for this situation is the motor will idle ok but wont run at full throtle. I am having a problem with my 1999 Mercury Optimax 225. When I hit full throttle the engine sputters and drops in RPM.

The problem seems like an electrical problem as it only happens at full throttle. I can cruise at 3500-RPM for twenty minutes with no problem at all and the engine purrs very nicely so I dont think it is a fuel delivery problem. At 60 in the antenna down range check the motor starts sputtering at wot.

At half throttle it seems to work OK although eventually even at half throttle it sputters. The control dont appear to jitter while the motor is doing its sick thing. Things I have done.

1999 mercruiser 50 with an alpha 1 outdrive when at full throttle the motor sputters and wont get up on plane. 57 liter mcm engine mercruiser in a boat. The engine RPMs will not go pass 2100 RPMs before is strat missing and poping or backfiring.

Bobs201 New Member. My 2003 2 stroke 150 merc runs fine at 12 throttle but dies out at full throttle after about 3 mins. It begins to sputter until I either ease off the throttle or it shits off.

It it hard to start after shutting off and cranks similar to trying to crank it with the kill switch off. I have changed the fuel filters had carbs. Just ran the first test today on my Brushless Venom Segad 55 build.

800KV motor 320amp esc 12s battery 2x6s 56mm 14 pitch prop. This setup was fine but only 98 kmh. The motor and esc didnt even get warm at all.

Then i tried the big 67mm 3 blade gas prop. Reached 116kmh but was not able to get full throttle because of the system stalling. Full throttle engine start to sputter.

I have a 36 vanguard that when I give it full throttle it starts to sputter and then catches up and engine runs fine. Just out of the pocket it wants to hesitate. I have checked all the fuel hoses changed to a new performance plug and now I.

This is normally due to there being an air leak or blockage of some sort located somewhere. Between the pickup tube that is in the fuel tank to the engine lift pump. What Causes a Boat Motor to Lose Power.

Your motor could be losing power due to this issue as well.