If it is like my Evenrude 4hp ‘light twin’ the answer is no. These motors are nick named ‘pull and go’. Before you start the motor besure to get the boat pointed in the direction you want to go.
How to Identify and Resolve Common Issues ?
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The engine stalls in neutral, at idle, only.
When your outboard starts right up, keeps running with throttle applied in neutral, but shuts down the moment you come back to idle speed in neutral, the issue is likely to be a sticky or broken AIS (automatic idle speed) valve.
Most boats must be in neutral before starting the engine. If your boat is in gear, the engine will not start, but other components like the lights and gauges will work. Verify the gearshift is solidly in neutral with the lever in the middle position between forward and reverse.
The crankshaft turns the main driveshaft running down the long spine of the motor. A small gearbox at the bottom of the driveshaft converts vertical spinning motion into horizontal spinning motion. The propeller powered by horizontally spinning gears powers the boat through the water.
The leading cause of outboard engine vibration is usually recognized as propeller damage, which can result from the prop being bent, broken, worn out, or not aligned properly. The prop can also experience vibration due to entanglement with fishing line and seaweed.
The basic idea of a neutral safety switch is to prevent starting a boat`s engine when its transmission is “in gear”. This prevents the boat from moving suddenly and unexpectedly when an engine is started and is a good safety feature. An unexpected sudden movement of a boat can be catastrophic.
Running-on is when the engine continues to turn after you`ve switched off the ignition because the fuel /air mixture is being ignited by a hot-spot in the combustion chamber .
Always warm up the motor thoroughly at idle before running at higher engine speeds. For the next eight hours you can run the motor in standard fashion but never for longer than five minutes at wide-open throttle.
What should you always do before starting an inboard engine? Before turning on the inboard engine, check for any smell of gas. If your inboard engine is powered by gas, the blower should be running for at least four minutes before starting the motor to ensure any hazardous vapours are fully dissipated.
Outboards start like a car; just tilt them down and turn the key. At least newer ones do. But it wasn`t always that way.
Vibration is almost always caused by one of four things: the engine, the shaft, the shaft supports or the propeller. In my experience, I have found that most boats` vibration problems stem from the propeller – but it is easier to look at the other areas first.
This can happen for a variety of reasons such as low fuel pressure, faulty fuel injectors or a dirty or failing idle air control valve. Low fuel pressure will cause the fuel injection system to provide less than the required amount of fuel needed for the car to run smoothly.
All modern vehicles have a neutral safety switch. The task of this switch is simple – unless the switch is activated, the starting circuit isn`t complete, and your car will refuse to start. Put simply, the neutral safety switch prevents the car from being started in any gear but neutral or park.
The switch prevents the engine from starting when not in park or neutral. This eleiminates the risk of starting an automatic car in drive or reverse mode. Located in the linkage or the transmission box, a bad neutral safety switch can cause irreversible damage to your car`s engine and transmission.
Low or high fuel pressure from a dirty fuel filter, defective fuel pump, clogged fuel tank strainer, bad fuel regulator or dirty/clogged fuel injectors can cause rough idling. Try replacing the fuel filter and add fuel injector cleaning treatment to your fuel tank to clean and hopefully unclog your injectors.
Carbonized spark plugs can lead to engine overheating and dieseling.
Re: Yamaha Motors – Prop spins while in neutral
On the hose the prop(s) will spin due to water pressure. Under water, the pressure should keep them from turning, or turning very little.
when motor is not running prop spins freely. so, even with the hubs unlocked, and the t- case in neutral, if the rear wheels are spinning, the front drive shaft will spin as well.
There is no harm in running your motor out of fuel with four strokes engines, but it`s not necessary to do in most cases (again, refer to your owners manual).
It`s important to never fill the tank of your boat beyond 90% full. This leaves room for gas to expand and avoids the potential for overflow. Ensure that all air vents and valves to the gas tank are open. After you`re done fueling, tightly replace the gas cap.
How many hours do boat engines last? Well-maintained inboard engines, inboard outboard engines (unless diesel), and outboards have a serviceable, average life of about 1500 – 2000 hours. If you`re looking at a gas-fueled marine engine close to or exceeding 1000 hours, inboard or outboard, proceed with caution.
Pro Tip: Before you start any outboard after it has been in storage, first pull the plugs, spray WD-40 in the heads, leave the plugs out and manually turn the motor by the flywheel or prop. If everything turns smoothly, then you can go ahead and move on to the next steps.
Disconnected, dirty or fouled spark plugs are common causes for engines that won`t start. Spark plugs typically need to be replaced every season or 25 hours of use. You should also check that the spark plug gap is set properly.
Spark plug fires and ignites the compressed air/fuel mixture just before the end of the compression (i.e., previous) stroke. This ignition/combustion forces the piston down the cylinder bore and rotates the crankshaft, propelling the vehicle forward. Piston moves down the cylinder bore from TDC to BDC.
That`s it for outboards, but if you have a stern-drive or an inboard you will need to run antifreeze through it and you`ll also have some plugs to pull and potentially a few other items to deal with depending on the brand; in the case of stern drives and inboards, we recommend breaking out the owner`s manual or taking …