'60 Johnson 75 hp not starting...Am I wasting my time?

[DaveD]

I just purchased a 69 Glastron with a '60 Johnson 75hp motor. <br />I just did a compression test, and all 4 cylinders checked at 90 psi the manual says that 100 should be the minimum. <br />I also have no spark, I have almost ordered a new coil and sets of points and condensers.... <br />Am I wasting my time?? Is my compression too low??? Would new rings fix this??? <br />Any suggestions would be much appreciated. <br />Dave

 

[fireman 757]

Re: '60 Johnson 75 hp not starting...Am I wasting my time?

Doing all the things you have listed plus putting in a carb kit would probably do the trick. Do you want to invest this much money and time? Can you get another good engine at the same price? This is a decision you and your wallet have to make.

 

[DaveD]

Re: '60 Johnson 75 hp not starting...Am I wasting my time?

thanks Fireman...<br />What about my compression....90...that ok....do ya think I need a ring job...or is 90 OK?<br />Thanks

 

[leeray]

Re: '60 Johnson 75 hp not starting...Am I wasting my time?

as long as all cylinders are at 90 or close to each other i wouldnt worry to much if factory is 100 goodluck

 

[Solittle]

Re: '60 Johnson 75 hp not starting...Am I wasting my time?

I am going to assume that it hasen't been run in a while. If so I would think that the rings might be gummed up a bit. And if that were the case I would tilt the engine up, squirt a bit of Marvel Mystery oil in each cyl, crank a couple times with the plugs out and let it sit for a day or two. That stuff works wonders. Then take it out and run wide open for a bit.

 

[Hooty]

Re: '60 Johnson 75 hp not starting...Am I wasting my time?

You might also do a de-carbon job and get compression up.<br /><br />c/6<br /><br />Hooty

 

[fireman 757]

Re: '60 Johnson 75 hp not starting...Am I wasting my time?

solittle and Hooty have some good low cost suggestions. If a carb kit and a couple of coils will get you going it will be worth it in my opinion.

 

[DaveD]

Re: '60 Johnson 75 hp not starting...Am I wasting my time?

Here is an update....<br />I put in a new coil, pair of points and a condensor.<br />I also replaced the starter selonoid.<br />So all i am missing for new parts in the electrical system is the key switch...<br />I still have no spark<br />I will run thru all the tests in the manual tomorrow.<br />Dave

 

[steelespike]

Re: '60 Johnson 75 hp not starting...Am I wasting my time?

Dave, Are you sure you have checked ignition switch/kill switch. Motor runs with switch open<br />stops with switch closed.<br /> Try for spark with switch/switches unhooked.