[Rhodes22-list] Poor throttle response

[R22RumRunner at aol.com]

Or, it could be starved for fuel. How does the exhaust smell? Rich or  normal?
 
Rummy
 
 
In a message dated 9/4/2008 6:10:15 P.M. Eastern Daylight Time,  
mweisner at ebsmed.com writes:

Rory,

I do not recall what specific engine we are discussing so  all comments are 
of a general nature (not all outboards have an  accelerator pump.)

It sure does sound like too rich a mixture.   Look for the choke.  Follow the 
actuator mechanism if you have to -  the choke is somewhere at the air intake 
of the carb.  It usually  looks like a disc in a tube that rotates to close 
off the air intake  during cold starting.  When fully open you should be 
looking at the  thin edge of the disc.  When fully closed, you should be 
looking at  the "top" (flat portion) of the disc, as it blocks most of the 
air  passage.  Partial choke setting opens the choke mechanism to some  
degree.

Air filters in many outboards are actually in the  housing.  If your engine 
runs fine until you replace the housing,  look for a very clogged air filter. 
If the air filter was the problem, the  engine probably would not run at high 
speed at all.

The problem may  be that the idle mixture is set incorrectly or that the main 
jet, which  sets the high speed mixture in many outboards, was damaged when  
cleaned.  This can occur if the mechanic did not set the main jet  actuator 
correctly.

It would be nice to know what was disturbed to  limit the possibilities.  I 
would check the float and needle valve  anyway, just to be sure.  It does not 
sound like a carb cleaner  problem at this point.

Mike
s/v Shanghai'd Summer  ('81)
Nissequogue River, NY


From: "R Orkin"  <roryorkin at verizon.net>Sent: Thursday, September 04, 2008 
5:54  PM
>
> The carb was cleaned recently but not by me so I dont know  if the fuel 
> float
> is the problem..
> Where do I look  for occluded choke passages and how do I clean them.. ?
> I was not sure  if there was an accelerator pump on this model. Was that a
> general  observation or specific to the outboard.
> I don't know where an air  filter is unless it is right up against the carb
> behind the air  intake
> Mixture is the most likely culprit but I need to check out some  of the
> other things so I don't try to compensate for another problem  with the
> mixture.
> There is a real lag between motor trying to  pick up the fuel on sudden
> acceleration..
> which is why I think  it is not the carburator float. A quick turn of the
> handle leads to  immediate stall.
> It is not burning off the fuel in the bowl then  stalling. The valve must 
> be
> working somewhat or it would not  refill at high rpm. If it is in the carb 
> I
> am thinking fuel  residue.. Will a fuel line aditive actually clean 
> anything
>  out ??
>
>
> R22MikeW wrote:
>>
>>  Rory,
>>
>> Since you can get to full throttle (slowly) this  rules out problems
>> related
>> to supply of air (air  filter is OK) and fuel (fuel filter, tank vent, 
>> fuel
>>  pump, etc. are OK) and also ignition.  If it stalls on sudden
>>  acceleration,
>> the problem is either due to too rich a fuel mixture  (check for occluded
>> choke passages, improper mixture adjustment,  improper accelerator pump
>> action, etc.) or more likely, improper  fuel bowl float setting (sudden
>> acceleration will burn the fuel  before it is replaced by the pump.)
>>
>> Have you cleaned  the carb out recently?  If so, did you bend the float
>>  adjustment?  The purpose of the fuel bowl is to maintain a fuel  reservoir
>> for rapid changes in fuel consumption so that the engine  is not starved
>> for
>> fuel.  The float is adjusted  so that it maintains a particular level in
>> the
>>  bowl.  It opens and closes a small needle valve in the fuel inlet  line,
>> regulating the flow into the bowl.  Too much and the  engine "floods" with
>> fuel; too little and the engine runs out of  fuel (starves) when rapidly
>> accelerating.
>>
>>  Small engine (carbureted) 101 ...
>>
>> Mike
>> s/v  Shanghai'd Summer ('81)
>> Nissequogue River,  NY
>>
>>
>> From: "R Orkin"  <roryorkin at verizon.net>Sent: Thursday, September 04, 2008
>>  4:42 PM
>>>
>>> My 9.9 Yamaha has had a variety of  starting problems. All seem to be 
>>> fuel
>>>  related. I seem to have it cleaned out to the point it will start  but
>>> still
>>> have poor response from the  throttle. Sudden acceleration will stall 
>>> it..
>>>  slow acceleration is ok and I can get full throttle.. Does this seem  to
>>> be
>>> a
>>> mixture, fuel pump or  other problem to anyone? perhaps  automatic choke
>>> issue  ??
>>>
>>> -----
>>> Rory  Orkin
>>> Tilghman, Md
>>> 2000 Recycled  Rhodes  22
>>> Duet ll
>>> -- 
>>> View this  message in context:
>>>  http://www.nabble.com/Poor-throttle-response-tp19319533p19319533.html
>>>  Sent from the Rhodes 22 mailing list archive at  Nabble.com.
>>>
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>>
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>
>
>  -----
> Rory Orkin
> Tilghman, Md
> 2000 Recycled   Rhodes 22
> Duet ll
> -- 
> View this message in context:  
>  http://www.nabble.com/Poor-throttle-response-tp19319533p19320793.html
>  Sent from the Rhodes 22 mailing list archive at Nabble.com.
>
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> To  subscribe/unsubscribe or for help with using the mailing list go to 
>  http://www.rhodes22.org/list
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