- PartsVu recommends religiously inspecting your spark plugs annually or every 100 hours, replacing them if they are fouled or damaged, and always replacing them every 300 hours.
Thus, How do you test an outboard spark plug? 
Additionally How often should I change spark plugs in my Yamaha outboard? Yamaha F225 manual says every 200 hours.
Is there a difference between auto and marine spark plugs? The only difference is that it is coated to protect the plugs from rust. Heat range are the same. Oh,I have twin 350’s in my other boat,that is how I know about Champ plugs. If you go to www.NGK.com,just type in your plug number to cross it over for marine use.
How do you clean marine spark plugs? 
Why does my outboard bog down when I give it gas?
Poor Gas Quality The fuel used for your outboard motor can be one of the primary reasons why your outboard motor is bogging down. And this is most likely caused by the ethanol content of the gas.
What does a fouled 2 stroke spark plug look like?
How do I know if my spark plugs need to be changed?
7 Signs You Need to Replace Your Spark Plugs
- The car is hard to start. …
- The engine misfires. …
- You’re heading to the gas station more often. …
- The engine idling is rough and noisy. …
- Your car struggles to accelerate. …
- The engine is really loud during normal driving. …
- Your ‘check engine’ light is on.
Is there a difference between marine spark plugs and auto?
The only difference is that it is coated to protect the plugs from rust. Heat range are the same. Oh,I have twin 350’s in my other boat,that is how I know about Champ plugs. If you go to www.NGK.com,just type in your plug number to cross it over for marine use.
What happens if you don’t replace spark plugs?
Spark plugs will depreciate over time, so various engine issues will arise if they are not replaced. When the spark plugs do not generate the adequate spark, the combustion of the air/fuel mixture becomes incomplete, leading to loss of engine power, and in the worst-case scenario, the engine will not run.
What is the life of a spark plug?
A standard copper spark plug has an average life span of 10,000-20,000 miles. Silver plugs, used for older vehicles, can last up to 20,000 miles. Expensive iridium spark plugs or platinum spark plugs can last 60,000 miles. Extended life spark plugs or long life spark plugs can last 100,000 miles.
What do you do with old spark plugs?
Spark plugs are pretty small, so it will be a waste of time to take them to the recycling center one after the other. The best way to go about it is to gather the plugs and dispose of them all simultaneously.
What are the best spark plugs for outboard motors?
Comparison Table
| Image | Title | Core Material |
|---|---|---|
| Top | NGK 3623 Spark Plug | Copper |
| Top | Quicksilver AC Delco MR43T Spark Plug | Copper |
| Top | NGK 5422 Spark Plug | Copper |
| Top | ACDelco MR43T Spark Plug | Copper |
What does an outboard tune up consist of?
Engine Tune-Ups: This service includes compression and spark tests, spark plug replacement, fuel filter replacement, greasing all fittings, and performing a test run. Pricing depends on the horsepower rating of your outboard motor. Please note that these prices do not factor in the cost of materials.
How often should you service a 4 stroke outboard?
Most outboard, sterndrive and gasoline inboard engines require basic service every 100 hours or annually.
How often should you service a Mercury 4 stroke outboard?
EVERY 100 HOURS OF USE OR ONCE YEARLY, WHICHEVER OCCURS FIRST.
Is it OK to idle a 4-stroke outboard?
Yes it is bad for them to idle all the time. The plugs load up with fuel as well as that fuel possibly washing out the cylinders. Outboard engines were made to run at their suggested WOT, this is why we prop our boats for just that.
How long can a boat sit without running?
One of the most commonly-asked questions we get is, “Is it okay if my boat isn’t running for a while in Fort Lauderdale, FL?” The answer is yes—but you have to do some maintenance beforehand. As long as it’s well maintained before going into storage, a boat can sit for a few months, a few years or even a few decades.
Should you run your outboard out of gas?
It’s best to get all of the gas out of the engine’s fuel system for that season that it sits. And generally, the easiest way to do that is going to be to just unhook the gas. And let the engine run until it dies, because it is out of fuel.
How often should you change the impeller on a Mercury outboard motor?
How Often Should You Change the Water Pump On Mercury Outboard? In most cases, you won’t need to replace the water pump unless the housing is damaged. Instead, replacing the water pump impeller every three years or sooner should avoid most water-pump-related issues and keep your outboard running in excellent condition.
How often should I change the oil in my Mercury outboard?
Answer: Every 300 hours or 3 years, whichever comes first. Question: Should I use Premium Blend or High Performance gear lube in my sterndrive?
How often should you start your outboard motor?
A few hours every week keeps the motor in better shape than using it two or three full days every month. The more often it gets used, the better it will run, just like any vehicle. If it’s left sitting idle at the marina or in a garage for the majority of the time, parts tend to go bad faster.
How do you check a 2 stroke outboard spark?
How tight should spark plugs be on an outboard motor?
Typically, 18 to 20 foot-pounds is as tight as any spark plug needs to be. Overtightening is a huge mistake; if the threads are stripped, the cylinder head will have to be removed and rethreaded. That can mean a huge repair bill, especially with a four-stroke engine.
How do I know if my 2 stroke is blown up?
How do you make a 2 stroke start easier?
What makes a 2 stroke hard to start?
(1) That you’ve flooded the engine by trying to start it, or that the lower end is loaded up (because you left the gas petcock on). (2) That there is no spark (thus, the plug is wet because the plug never ignited the fuel).
Should I put dielectric grease on spark plugs?
Where To Put Dielectric Grease On Spark Plugs? Dielectric grease should be applied to keep the spark from your ignition coil, which is supposed to go through the spark plugs, from arching around. It also prevents it from going through the boot to the ground.
Should I use anti seize on spark plugs?
Metal shell stretch changes the heat rating of the spark plug and can result in serious engine damage caused by pre-ignition. Do not use anti-seize or lubricant on NGK spark plugs. It is completely unnecessary and can be detrimental.
What happens if you over torque a spark plug?
Over torque causes the insulator nose to overheat and start pre-ignition. The thermal load and shockwaves of pre-ignition and detonation can quickly destroy the electrodes of a spark plug and/or cause a hole in the piston crown.