[janneman]

Let me do a brief introduction... I'm from the netherlands - AKA holland - you know, tulips, windmills, cannabis and importing people to north america

I recently bought a older boat with a mariner outboard. As it has starting problems, I cleaned the carburators. I pulled the spark plugs - eeeek!
I am really doubting if it were the right plugs in the first place, so i do not want to blindly replace them. Anybody knows what plugs it should have?

(2 stroke, 4 cylinder engine)

[BYBUTTERS]

NGK spark plugs can be found on the web. You will need the model year for your search.

[Silvertip]

That spark plug is called a "surface gap" and I believe is the correct "style" of plug for that vintage engine. I also believe you will find that NGK BUHW or BUZHW is the proper number but you will need to provide a model year. The plug also indicates that this engine is highly carboned (high amount of carbon deposits). There is a product here in the states called SeaFoam which is used very effectively to remove carbon deposits. Mercury and Yamaha have their versions of similar products. Power Tune is one brand. Be aware that if you decarbon your engine at home, do it on a surface that you are not especially proud of as it makes a dreadful mess. You might also notify your local fire brigade (and your neighbors) before you do this or they may think your home is on fire. It does create a great deal of smoke. You may need to repeat the process two or three times. Good luck and welcome to the forum. I would guess it's a good thing to have a boat in Holland -- just in case the leak in the dike is bigger than your finger!!

[janneman]

Thank you foaks for the info - this afternoon i went to the shop with the old champion plug (L75V) and indeed they recommended the equivalent of NGK: BUZHW. I just wanted to be sure the right plugs were installed in the first place.

Originally Posted by Silvertip

Be aware that if you decarbon your engine at home, do it on a surface that you are not especially proud of as it makes a dreadful mess. You might also notify your local fire brigade (and your neighbors) before you do this or they may think your home is on fire.

Lol - i did hear those before yes - while reading the forum i stumbled on other posts describing the "decarbing". Actually i scraped carefull in a cylinder and it was not that bad what came out, but I can imagine there is some goo here and there - seen the spark plug. So I'm considering the procedure - i just need to have a waterhose-adapter before i start it.
The firebridage is at the end of the street ha ha lets' see if they are alert

As stated above: model year is 1985.

I dont know if the engine has been still for a long time - at least there is cooling water enough - so appearantly the impellor still is half-decent.