[Rhodes22-list] Poor throttle response

[Michael D. Weisner]

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
> -- 
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