Logo
FULL SITE MENU

Dry Plug

J

J-dub

New member
[h=2][/h] Hello, I am new to the forum so i hope im doing this correctly. I recently was given a 19 ft sea nymph with a 93 120 hp Evinrude. It had sat for 6 years and had not ran for that time. Once it was home i put new carb kits and new plugs Flushed the fuel tank installed a new fuel water separator, Deleted the VRO and premixed at 50 to 1, flushed all the old oil and fuel out of the pump and added new fuel lines. Took it to the lake and she jumped right to life but seemed to run a little rough after about 30 minutes i pulled the plugs and the bottom left plug was dry. I did do a compression test and all 4 cylinders were between 120 to 125 psi. the plug in question is firing i made sure of that as well. any help you be great.

Thank You
 
Compression is okay.

Spark, with s/plugs removed.... The spark should jump a air gap of 7/16" wide with a strong blue lightning like flame... a real SNAP! Does it? Note that the 7/16" air gap is important!

When naming a cylinder, it is a good idea to name the numbered cylinder. Standing in back of the engine facing the spark plugs, the cylinders are numbered as follows.

2.....1
4.....3

Do not use terms such as left or right as that would depend on where a person is standing. Cylinders 1 & 3 would be "Starboard".... Cylinders 2 & 4 would be "Port". I assume you are speaking of cylinder #4?

If compression and spark are as they should be... the most likely cause is that something let loose in the cylinder #4 carburetor... check it.

NOTE 1: On those loop charged engines, if I remember correctly.... and if I'm not, hopefully another knowledgeable member will correct me.... the carburetors feed the cylinders in a "X" fashion, that is #4 cylinder (port bottom) would be fed fuel by the opposite side's carburetor (starboard bottom).

NOTE 2: If you didn't manually and carefully clean the brass high speed jets with a piece of single strand steel wire, do so now as solvent just doesn't do that job properly. They're located horizontally in the bottom center portion of the float chamber, way behind the drain screw. Sitting for that length of time, they're sure to be fouled.

Let us know what you find.
 
Last edited:
Excellent Joe........maybe J-dub sold the boat already after that piece of crap migrated through the jet. Sometimes this forum is like talking to an old man with his hearing aid turned off.
 
Back
Top