1995 Johnson cutting out when trim up?

[Toad64]

I have a 1995 Johnson 60hp with the outo oiler dissconnected. I just got the boat back in the water after a 2 year restore. When I first started the motor on the muffs it was hard to start but got it going so I deceided to take it to the lake a couple of days later. I mixed the oil 50:1 and put in sea foam that is suppose to get all the gunk out. When I got to the lake and in the water I had the trim up a bit and on the third try it started and ran rough. When i got it out into deep water I trimmed it down and took off. It ran rough for a little while but smoothed out and ran very good so i went back to shore to pick up other passangers and had to trim up and it started to run rough again. After getting back into deep water I trimmed down and it ran fine. So i took off again and it took off fine but when I trimmed up again it ran rough. We where on the water for about 2 hours and ran about 5 gallons of gas and every time i would trim up it ran rough. Can anyone give me some insite as to what might be the problem?

 

[RRitt]

Re: 1995 Johnson cutting out when trim up?

carb? float bowl?

 

[Toad64]

Re: 1995 Johnson cutting out when trim up?

Do you think it is something that might work its self out or is there something i might put in the gas or a rebuild?

 

[Toad64]

Re: 1995 Johnson cutting out when trim up?

O what RPM should it run at WOT?

 

[RRitt]

Re: 1995 Johnson cutting out when trim up?

Some engines after sitting a long time get gummed up float bowls that do not properly fill with gas. It is generally an easy thing to check since all you do is observe the fuel level in the float bowl. Many carberators even have a glass viewing window. I am only suggesting that it might be worth checking. For all I know, your engine is fuel injected.

 

[Toad64]

Re: 1995 Johnson cutting out when trim up?

I don't see a sight glass on any of the three carbs.

 

[Will Bark]

Re: 1995 Johnson cutting out when trim up?

Your fuel hose isn't getting pinched or kinked when you trim up is it? Been there.

 

[Toad64]

Re: 1995 Johnson cutting out when trim up?

I went and looked at all the hoses and wires grabbed a flash light and dove in and found a black wire had came loose from a green wire that ran to the trim motor. i made sure they where both ground and plugged them back together. does anyone know if that could have caused the problem. I did not see any pinched hoses.

 

[RRitt]

Re: 1995 Johnson cutting out when trim up?

A perfect trim system would not have a black and green wire spliced together. Black = ground, green = down, blue = up. green or blue must never touch ground on a 3w trim motor since this would activate the corresponding field coil and insruct the motor to spin forward at full speed and reverse at half speed. Net result is usually burned out motors, melted wires, and eventually fire. In a 3w trim system, blue and green are only allowed to be 12V activate or completely disconnected. If you have a 2w trim system, then there is no ground. Instead the the motor only has two wires - blue and green. It reacts to whichever wire has higher voltage. You could hook one wire to 112V and the other to 100V and get the exact same result as using 12V and 0V. Two wire motors don't have a ground reference, it's all about relative voltage of blue vs green. However, 2w motors can generate strong magnetic fields and induce galvanic corrosion. IF you have a 2w motor then you should ALWAYS install a bonding strap between the trim pump and your anode (or aluminum near anode).


That given .... it is possible for trim to work with a loose or diconnected ground wire. Many trim motors have grounded frames. Most trim systems use plastic bushings and most trim motors use rubber seals. This can cause grounding problems if you depend upon trim motor frame without a dedicated ground strap. Nonetheless, it is not uncommon to see 3w trim systems operate fine without a dedicated ground. The trim and ignition circuits are not interconnected. Any problems with trim should not affect engines ability to generate spark. Trim is a high amperage circuit that typically draws its main power from battery or starter. Ignition is a low amperage circuit that generally draws power from the regulated stator/alternator output. In order for the two electrical streams to interact generally requires a major problem with electrical wiring that would also represent a fire hazard.

 

[Toad64]

Re: 1995 Johnson cutting out when trim up?

The black wire had a female end and the green had a male and no other wires where disconnected so i check both for voltage had nothing then checked for continuity to ground on both and had that so i hooked them together and nothing happened so i ran the trim up and down and it worked fine. i will go back and do some more looking tonight.
I did not think the trim system was tied into the ignition system but was not sure. thank you.