[MHml] Multihulls Digest, Vol 28, Issue 13

[TLam45387 at aol.com]

Mike,

I do know that the early 9.9 four strokes had a chronic interference between 
the plastic foam float and the float bowl.   Would cause the float to stick in 
the down position allowing fuel to flow into the engine in excess.   This 
matches your symptoms.   Also look for signs of gas in the oil.    

Examine the float and the inside of the bowl for signs of scuffing and sand 
down the float in these areas to assure clearance.   When you can get one, buy 
a new float and check it too.   Do change the oil if diluted as the ultimate 
symptom is to throw a rod.

Tom LaMers



> Hi,
> Went for a sail this weekend, only to find the Yamaha
> Outboard won't start again!!
> (I had the carb cleaned and serviced, new fuel pump
> diaphram, fuel lines/filter checked, (?250) in France),
> and on Saturday I took the carb off again (no apparent
> problems) and put 2 new spark plugs in
> It will just about start, very lumpy, some smoke, but no
> power when you open her up the engine revs
> just don't change. Took the plugs out after a few minutes
> and they are completely sooted up??
> 
> 
> Any ides??
> 

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