1985 Johnson 60Hp motor truning over very slow

[jtexas]

Re: 1985 Johnson 60Hp motor truning over very slow

don't dry 'em with a towel - even a little piece of lint can get in there & mess with ya.

yeah, the dealer ought to have the gaskets in stock, also replace the needle valves & valve seats. It's better to just get the kit - the oem kit cost about $20 more than the sierra kits you get on iboats but includes a new float - but you can usually re-use the float unless its saturated or falling apart.

Johnsons run best on Champions - better not to use NGK if you can help it - my experience has been that the NGK center electrode wears down way faster - others on iboats have blamed NGKs for engine failures - not knocking NGK they are great plugs in the right application but for some reason OMC motors don't like 'em.

get the fuel line from the johnson dealer if its like mine, it's an oddball size

I'm guessing you had to set the idle so high because it was dropping a cylinder - recommend put the spring back on before firing it up again.

 

[srt4wad]

Re: 1985 Johnson 60Hp motor truning over very slow

Ok this is where we are at, i bought new kits today and let the carbs soak over night. I sprayed all holes and I put the new float and gaskets in and put everything together and started the motor up and it is still dropping a cylinder at idel but when I lower the throtle lever it runs fine.

There is one question I have and that is, all the adjusting screws where all tight when I took the carbs apart last night I was going to count the turns and they were all tight. Could this be an issue? I still think we have an issue with the adjustment on the carb rails.

Is there like a rule of thumb for the fuel/air ratio screw for florida? Could that be an issue? I just don't understand how that thing ran fine until we ran out of gas and since then it has been running like crap. It has to be an adjustment. If anybody can give some more advice please let me knwo.

Thanks
Wade

 

[jtexas]

Re: 1985 Johnson 60Hp motor truning over very slow

Whichever cylinder is not getting fuel is also not getting lubrication. To Figure out which one it is, cylinder drop test: with the engine idling momentarily pull one spark plug wire at a time (use an insulated tool) - if the engine RPMs don't change, that cylinder isn't hitting.

I was thinking your carbs had fixed jets - here's the idle mixture screw adjustment procedure (one per carb):
http://forums.iboats.com/bbBoard.cgi?a=viewthread;fid=36;gtid=1105882

When you say "carb rails" I think you mean the linkage between the carbs? At idle, are both butterflies fully closed? do they open simultaneously to fully horizontal with the throttle (shift/throttle lever, not the hi-idle lever) in WOT position? Does the throttle cam hit the roller (bottom carb) right on the mark?

by the way, don't rev her up on the muffs any higher than necessary to keep her from dying - needs back pressure on the exhaust to keep bad things from happening.

have you ordered a manual?

 

[srt4wad]

Re: 1985 Johnson 60Hp motor truning over very slow

We did the drop cylinder test and when we pulled the wire the motor died on both plugs. I assume that is fine since we did get a responce (died),

Now, should we be making the adjustments while the motor in in the water not muffs for best results? Also, we noticed that when the motor is at idle the butterflies are almost closed is this right? We ordered the manual last night but, I don't know when it will be here and we want to work on it and get it going again and not have to wait because it kills us when we can not work on it.

Since we do not have the manual right now what should the RPMs be at when idel and WOT?

Thank you for all your help I know we are being a pain but you guys have been very help and we know you guys will be able to help us.

Thanks
Wade and the Swinging Dicks