Classic Fifty Starting Problems (Runs fine once started)

[rdomingu]

Have 89' Classic Fifty, tuned up 5 yrs ago and then sat until now. New gas, fuel line, and tank. Really hard to start - takes about 10-15 min. of trying. Once running, runs great. After running, will immediately restart within 5-10 min.). I've made sure that fuel line bulb is hard (for priming) and tried starting with and w/o the choke on. Really clueless on why hard to start - can smell gas, almost as though it is getting flooded but, even if I don't prime or choke, just as hard to start. Anyone have any reccos?

 

[Laddies]

Re: Classic Fifty Starting Problems (Runs fine once started)

If it won't start cold ussually the problem is a lean condition or operator inexperince. You might help it by opening the low speeds a 1/4 turn or you may need to clean the carbs

 

[tashasdaddy]

Re: Classic Fifty Starting Problems (Runs fine once started)

welcome to iboats. the first thing i would do is change the impeller. sitting 5 years, it is hard, i will disintergrate, possibly clogging cooling system of worse burning up the engine. read "awakening a sleeping outboard' and outboard won't start' in the following link

http://www.iboats.com/bbboard/bbBoard.cgi?a=viewforum;fid=36

 

[yamamarinetech40]

Re: Classic Fifty Starting Problems (Runs fine once started)

Obviously, the carbs need to be cleaned and or rebuilt...you smell gas you say...i would rule out lean then...needle probably sticking...clean 'em

 

[yamamarinetech40]

Re: Classic Fifty Starting Problems (Runs fine once started)

Also, and very important....you should realize that the entire time you sit there cranking that engine, if it is pouring fuel into the cylinders, you are washing out all the oil residue....the liquid oil/gas mix isn't a great lubricant, it has to be burned to work as a lubricant(well) and if you was your engine very thouroughly like you may be, then start it....my goodness

 

[Laddies]

Re: Classic Fifty Starting Problems (Runs fine once started)

Also, and very important....you should realize that the entire time you sit there cranking that engine, if it is pouring fuel into the cylinders, you are washing out all the oil residue....the liquid oil/gas mix isn't a great lubricant, it has to be burned to work as a lubricant(well) and if you was your engine very thouroughly like you may be, then start it....my goodness

huh - :/

 

[Silvertip]

Re: Classic Fifty Starting Problems (Runs fine once started)

YamaMarintech -- I'm just a little curious why you feel the fuel/oil mix is not a good lubricant (unless burned as you say) since that very fuel/oil mix makes its way into the crankcase to lubricate the crank, bearings, lower cylinder walls, etc and there is no "fire" going on down there! Your statement would be somewhat true on a fourstroke however since excess fuel without oil would be washing down the cylinder walls.

 

[yamamarinetech40]

Re: Classic Fifty Starting Problems (Runs fine once started)

That's true, halfway. What goes around in the crankcase is of course the fuel with oil in it, but this is being greatly "oiled' by additional oil that is a residual from the burnt fuel, washed thru with that mix....when the engine isn't firing all you have is the straight mix and the "residue" is taken off the internals. When the engine does start it takes so many strokes for the residue to "oil up" the mix again....does 50:1 feel slippery to anyone?

 

[Silvertip]

Re: Classic Fifty Starting Problems (Runs fine once started)

I've read your last response several times and it is either not what you really wanted to say or else very incorrect. "What goes around in the crankcase is of the course the fuel with oil in it." I'm ok with that point because its true. "But this is being greatly "oiled" by additional oil that is a residual from the burned fuel, washed through with that mix" is where things get real fuzzy. First, I doubt that burned oil is a great lubricant and second, how does "residual oil from burned fuel" get into the crankcase as you said happens. You keep mentioning residue -- what exactly is this residue. If it's byproducts of combustion, I don't want it to build up and definitely want it out of the engine. If you are talking about the additives in the oil, those will be present whether or not the engine is running.

 

[Silvertip]

Re: Classic Fifty Starting Problems (Runs fine once started)

Just one more thought -- if you don't feel 50:1 is slippery, try running a motor without it.