Hotter NGK Spark Plugs

[woody]

Well, with the new boating year upon us, it was time for me to install a new set of spark plugs in my Yamaha150.

Earlier this month I pulled my old plugs for a visual inspection and noticed that my old Autolite plugs had some "black deposit buildup", leading me to believe that these plug were not burning properly and not hot enough for my motor's setup.

Following a boat mechanic's recommendation, I went with a standard set of NGK spark plugs that were one number hotter in hopes that this would correct my motor's lack of combustion.

Well here are my results: With the muffs on, the first thing that I noticed was how much easier my cold motor was to start. The motor fired on the second try and "warmed up" much much quicker. The sound of the motor at idle with the "muffs on" was music to my ears.

My boat's response on the water was very noticeable, compared to the boat's performance with the colder autolite plugs.

Final inspection of the new plugs showed no sign of the "black build up" previously found on my old Autolite plugs. This time the plug's electrode and tip showed the brownish bronze color, or perfect combustion.

I do plan to inspect my new plugs on occasion for continued proper combustion. Of note: if the electrode and tip turn a "white color" the plugs are too hot and can possible burn a hole through your pistons. SO BE ADVISED AND BE CAREFUL WHEN INSTALLING HOTTER PLUGS.


-Mark