cocked carb float

W

wmacleod

Cadet
Joined
Nov 7, 2007
Messages
7
Took the carbs off my 95' 90 hp ocean runner again to give them a more thorough cleaning. I think the float level is wrong per the manual; however, it only says adjust it...not how? The video guy uses a hammer i think. The little piece of metal holding the needle in place on the bottom carbs seems worn out. I put them back on anyways just to see if I could tell a difference.

With new spark plugs it fired up fine and ran smoother for about a minute. Then backfired several times and died. Tried to start it again and it blew a smoke ring, it was smoking pretty good while started too. Pulled the new plugs and they were wet and black. I will fool with the needle valve again to hopefully get the right mixture. Also, in layman's terms what does 30-35 lbs pressure mean when tightening the high speed jet? Really tight???

Another question.............how important is it that the airbox be clean? I'm guessing fuel can get dirty in there and then re-circulate and dirty the carbs again??? I don't really know.


Lastly, I've been putting 93 in the tank, I'll change when I get a chance............could this cause the excess smoking??? Or does it not really matter.

All in all, completely new to this, so thanks for your help.
:confused:
 
HighTrim

HighTrim

Supreme Mariner
Joined
Jun 21, 2007
Messages
10,486
Re: cocked carb float

I believe that the drop on your float should be around 1 inch, but more importantly, when you turn the carb body upside down, the float should be parallel to the gasket surface, and just slightly off. A torque wrench is a necessity when working on an outboard, and are not overly expensive anymore. Ensure that the plugs are torqued to 18.5 to 20.f ft lbs.

Backfiring out of the exhaust port is caused by having the ignition system fire a particular cylinder when the exhaust port is open ( ie piston down). This would sound like a shotgun going off..... is this the condition that you're experiencing?

This is usually due to a sheared flywheel key, a flywheel with melted (moved) center sensor magnets if they exist, timer base leads routed incorrectly to the powerpack, or having the leads from the powerpack to the coils reversed to mention a few.

93 octane will not hurt, but is not necessary. 87 or 89 octane is sufficient.
 
W

wmacleod

Cadet
Joined
Nov 7, 2007
Messages
7
Re: cocked carb float

Well, maybe not a backfire, more like a couple coughs, but I've read on here about a mixture being lean. It did not do this before I adjusted the needle valve. Before it seemed to be smoking more, and the smoke was darker. Still, it was smoking pretty good.

As for the float, I'll turn the carbs upside down tomorrow when I take them off and see what I can tell. But sitting normal, they weren't completely parallel.

Thanks.
 
You must log in or register to reply here.
Top