1985 Johnson 25 HP - Sluggish

[442]

Hello All,

I can use some direction in trying to figure out what just happened to my engine.

I went out the other day and after some fishing started the motor and it idled fine. When I placed it in forward the engine would only accelerate minimally compared to its normal power. It was not chugging, it just ran like it was on a governor and would barely move past a slow troll. It certainly did not seem like a fuel issue so I took out the plugs and changed them. That did not help. I made it back to the landing and now am trying to figure this out. When checking for sufficient spark what is the recommended technique? Just pull one plug wire and hold it close to the plug tip? What should it look like? If that seems OK then what? The engine does not miss and the only thing I can relate this too is that it is being governed. That is how it acts. I twist the tiller handle all the way to the max and it just moves slow. It revs up fine in neutral but will not in gear and under load.

Any suggestions will be greatly appreciated.

Thanks in advance,

Vince

 

[jasper60103]

Re: 1985 Johnson 25 HP - Sluggish

You need a spark tester. It cost about $7 at auto parts store. The spark should jump 1/2 inch gap.

 

[tashasdaddy]

Re: 1985 Johnson 25 HP - Sluggish

compression and spark test with testers. http://forums.iboats.com/showthread.php?t=313963&highlight=compression

 

[442]

Re: 1985 Johnson 25 HP - Sluggish

Thank you very much.

I greatly appreciate it!

I will start with your suggestions.

Vince

 

[442]

Re: 1985 Johnson 25 HP - Sluggish

Well, I was able to complete the compression test. Each of the two cylinders were exactly the same @ 127

I started the spark test and the top cylinder would run with a gap of a half inch. The bottom I did not get to test as the rewind spring decided to take a dirt nap.

So until I replace that part, I will not get to finish the spark test on the other.

It seems odd but the motor screams when its out of the water and running with the ear muffs on it.

I will continue the spark test and give the final results. If that test comes clean, what next?

Thanks again,

Vince