1 wet plug 1977 25 horse Evinrude electric choke/start

[Oldpatch]

I'm wondering why the number one cylinder spark plug is wet and the bottom plug is dry after running in a barrel for 15 min? Trying to get this motor dialed in. Hard to start when its been sitting awhile.
Should I run it out of fuel if its going to sit a few days? Thanks for your help.

 

[racerone]

Could be running on just 1 cylinder.-----Does spark jump a gap of at least 3/8" on both leads ?---Could be a bad sparkplug.-----Could be a ruptured fuel pump diaphragm as well.-----And post the all important actual compression values.

 

[Oldpatch]

It has 119 on both cylinders. The plugs should be changed. Also do the plug wires come from the corresponding coils upper coil to no. 1 cylinder? There is no metal band on the upper wire Is there an easy way to test the fuel pump for a bad diaphragm?
Thanks Racerone.

 

[fitz73222]

Bad lower crankshaft seal. Fuel is leaking through the seal, not enough fuel to fire. Despite good spark.

 

[Oldpatch]

Ok thanks. I guess I have a bit more work to do.

 

[racerone]

The top cylinder is the one that is black.-----Doubt that the lower crank seal is the issue.-------These pumps are elegantly easy to take apart and inspect.----Does spark jump a gap of 3/8" on both leads , yes or no ?

 

[Oldpatch]

I just have an old school tester that looks like a plug and clamps to a ground. What type should I get to be able to measure the jump?

 

[racerone]

You can make something using cardboard / glue / wires.------Glue wire onto the cardboard with 3/8' gap.----Stick one end into plug boot and clip other end to ground.----Or buy one for about $10 at an automotive store or online.

 

[Edchris177]

As Racer said, you can make something like this for free.

 

[Oldpatch]

I will definitely try that. Thanks.

 

[Oldpatch]

I think the bolt for the plug boot is a nice touch Edcris.