1986 150 johnson questions

[ceejkay]

hey guys a little background on this motor.. i just bought a boat and the po said it had sat for a couple of months.. i figured not really a problem, motor cranked over and would spudder but not fully start up.. he said the carbs were just cleaned, yada yada.. you know how the story goes.. so not believing a single word he said, when i brought the boat home i got a rebuild kit for the carbs and ordered the correct champion plugs for it.. he had ngk in there... so while i was waiting for my parts to come in i started to tinker a little bit.. first order of business was to clean up some electrical components.. every ground and any other peice that had a wire running to it has corrosion.. so i cleaned all of it up.. here is one of the components that was cleaned..

after

Now for the question.. I hooked everything up and pushed in the key and fired right up..WAHOOO!! I let it run for a good 15 min or so.. the tale tell was nice and strong.. i do know i have some more work to do.. but does this look right?? i have the gas mixed rich just because i dont know how long it sat for (25:1)

 

[emdsapmgr]

Re: 1986 150 johnson questions

From your location, this engine must have been in salt water at some point in it's life. You are very lucky it started well.. The black, tarry residue is somewhat common for most older crossflow engines. Not all of the incoming fuel/oil charge is combusted-some unburned incoming charge gets sucked out the exhaust port before it closes. So, you have both burned and raw fuel/oil being discharged down the midsection exhaust tube. Heavy oiling (like your 25 to 1) does not help this situation. You do have a possible problem you could address to alleviate the visual aspect of this. Likely the rubber grommet at the bottom of the exhaust tube (where it dumps into the lower unit) may have deteriorated. When this happens the oily mix will leak out at that seam between the bottom of the midsection and the top of the lower unit. (in your lower picture.) Your engine will probably run fine the way it is....however, you may want to addess this problem sooner, rather than later. The leaking rubber gasket can permit exhaust gasses to get close to the plastic water pump housing. That's more of the problem. The exhaust heat can deteriorate/warp that plastic housing over time. It's probably a $6 rubber gasket.

 

[ceejkay]

Re: 1986 150 johnson questions

thank you, thats good to know... well that fits into the plan as i am going to do the impeller anyways.. and yes this motor has been salt water only..