2004 9.9 mercury 2-stroke half power

[capt littlelegs]

Originally Posted by kenrahe

is single carb. how do i do a colour tune.an whats the easyest way to check the resistance on the coils

Sorry meant it's unlikely to be the fault if it running on other cylinder with a single carb. Just do a comparison resistance check on the coils, you'd need to disconnect them first. The Colortune is a glass topped spark plug that lets you to look into the cylinder and see what the spark and combustion flame colour are doing. If you don't have one don't worry just run the engine on the good cylinder while observing the suspect spark on a spare plug fixed to the head. If it's nice and strong and continuous the ignition should be ok.

[El Sea]

One of the first things I recommend to problematic gas engines:
try running on a fresh 6 gallon can of gas, isolate the main tank until fuel or engine is the issue.

El Sea/L.C.

"Suckin Sludge & Havin a Gas"