[Rhodes22-list] Poor throttle response

[R Orkin]

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.