Johnson 88hp outboard problem

[jerryny]

Hello all, and thanks in advance for any help given.

I have an 87 Johnson V4 88hp outboard. When first put the boat in the water it runs great for about 10 mins or so. After that it loses most of its power.
I've replaced the plugs, wires, and drained all the old fuel out of the tank and filled it up with fresh 89 octane gas and fuel stabilizer. After the problem occurred I pulled all the plugs. Both plugs on the starboard side are a nice golden brown. However the 2 plugs on the port side are black and wet. Any ideas on what might be wrong. I was thinking the the only thing the 2 cylinders have in common would be the carb. Please correct me if I am wrong. Also just wondering why it only does it after it warms up.

Thanks
Jerry

 

[Daviet]

Re: Johnson 88hp outboard problem

Have you checked the spark when it starts to act up, maybe you have an ignition componet overheating and loosing spark when warmed up.

 

[jerryny]

Re: Johnson 88hp outboard problem

Have you checked the spark when it starts to act up, maybe you have an ignition componet overheating and loosing spark when warmed up.

What part of the ignition is common to the 2 cylinders on the port side?? The 2 cylinders on the starboard side are fine.

 

[Daviet]

Re: Johnson 88hp outboard problem

Power pack, coils. If you check the spark at least you will know if you are fighting a ignition or fuel problem. You might also think about doing a compression test also.

 

[boobie]

Re: Johnson 88hp outboard problem

Check the spark. It should jump a 7/16 " open air gap on a spark tester.