140hp johnson 1 cylinder no spark

[trev]

Hi Guys,<br /> I could use some help I have a 1978 johnson 140 that runs pretty well some of the time.Last week went out fishing going along at about 50mph when I lose power top speeed drops down to around 35mph.This problem has been has been going on for about six months off and on but it has been getting worse latley.Took off the hood on the water and pulled plug wires was getting spark on all cylinders except number 1.The motor ran on 3 the rest of the day until about five minutes before I got off the water not a fouled plug changed them.Got any guesses timer base or stator.Thanks

 

[rickdb1boat]

Re: 140hp johnson 1 cylinder no spark

Did you swap plug wires and see if the problem continued? In other words, did you try a different wire on the one that was not firing?

 

[Walker]

Re: 140hp johnson 1 cylinder no spark

Check and clean all coil connections, especially the grounding straps.

 

[rodbolt]

Re: 140hp johnson 1 cylinder no spark

hello after checking all of the above and it is still acting up the swap the power packs.its either that or buy the test equipment. if the problem will move with the pack odds are its the pack. if it stays odds are its not.<br /> good luck and keepposting

 

[trev]

Re: 140hp johnson 1 cylinder no spark

Thanks I will try all above and get back to you .