Bringing neglected Johnson 90HP back to life.

[interalian]

Your pictures aren't showing.

 

[JerryB1987]

dont know why you cant see them

They show for me both logged in and as a guest

 

[ondarvr]

I don't see them either.

 

[Bosunsmate]

no pictures as has being said. But lack of springiness normally means a gunked up timing base with dirt in the grease

 

[JerryB1987]

Lets try the first one again

 

[JerryB1987]

And the 2nd one, I have to move the linkage by hand to this position

 

[JerryB1987]

And the third one for cam and cam follower

 

[interalian]

Lets try the first one again

This is full spark advance.

 

[interalian]

And the 2nd one, I have to move the linkage by hand to this position

This should be your idle position. I've not had my throttle cable off recently, but do recall there's not much in the way of spring to return it to idle. Relies on control cable to push it back IIRC.

 

[interalian]

And the third one for cam and cam follower

That's a pretty big gap between the cam and roller. When you advance the throttle, where does the roller 'just touch' the cam?

 

[JerryB1987]

That's a pretty big gap between the cam and roller. When you advance the throttle, where does the roller 'just touch' the cam?

It touches right at the point the cam changes direction, just above the lower mark on the cam. I'll get a picture, probably tomorrow, of it just touching, I have the carb off right now replacing fuel lines, found several brittle oil and gas lines so I took the carbs off to clean them and replace the lines.

 

[Bosunsmate]

This should be your idle position. I've not had my throttle cable off recently, but do recall there's not much in the way of spring to return it to idle. Relies on control cable to push it back IIRC.

Worn cables can make returning to idle stops hard to achieve.Mine are really worn so ive cleaned my base up spotlessly and it still manages to retard ok

 

[Bosunsmate]

That's a pretty big gap between the cam and roller. When you advance the throttle, where does the roller 'just touch' the cam?

Yes very true, thats a big gap. Pull off your front cover and make sure the butterflys are totally closed in that position you have in that photo

 

[interalian]

Looking at the one photo showing both throttle brackets, it looks as though the screw on the lower one has been moved. It's possible in this case the two throttles are not in sync. Both sets of throttle butterflies need to be fully closed when the roller is off the cam, and when moved by hand should all open at right angles to the carb throats.

 

[Bosunsmate]

Looking at the one photo showing both throttle brackets, it looks as though the screw on the lower one has been moved. It's possible in this case the two throttles are not in sync. Both sets of throttle butterflies need to be fully closed when the roller is off the cam, and when moved by hand should all open at right angles to the carb throats.

Totally, the bottom one looks like its not even hooked up

 

[JerryB1987]

Looks weird I know, but they do work together. Here's the lower throttle linkage from above. There is a plate that can't be send looking directly at it as the first pictures were and is where the connecting rod hooks. I am hoping when I put it back together it will turn out the carbs were not torqued down so was allowing air to be sucked in pulling the butterflys open, the bolts seemed loose and the gasket between the carb and engine all was not "mashed" like I would expect it to be if the bolts were tight when I took the lower carb off to replace the fuel lines. Fingers crossed it is something that simple.

 

[interalian]

Guess the motor had been in the midst of a lot of work, and just loosely buttoned up then left. You'll really need to go over it or you'll get more surprises.

 

[JerryB1987]

That's what I am thinking at this point Interalian. The last owner had passed away before I got the boat so no one really knows its history. As clean as some of the parts, such as the gaskets and inside of the carbs, I think it was redone to get ready for the season but not tested afterwards. I might end up having to have someone do it for me as I don't have the specialty tools needed for some of it or the expertise to get it done in a timely manner. It's one thing to disassemble a motor myself compared to trying to guess at what someone else did ahead of me.

 

[JerryB1987]

I got everything put back together and fired up the engine yesterday, for having been off for almost 3 years it came to life pretty good. So today since it was so nice out my wife and I decided to take the boat for a quick run to see how everything was working. Now I know I have a problem with the engine. Running nearly full out it only made 8 knots. Even though I knew there was an issue and turned back it ran out of gas before I could get back to the marina Hard to believe it sucked down 5 gallons of fuel in less than 30 minutes. I had towing so had the boat towed back and the Captain that came out thought the prop had to be slipping. Once I got home I put the boat in gear and was able to turn the prop by hand. Not good

 

[racerone]

Compression test results are ?