On May 14, 11:56 pm, Tony Hwang wrote:
wrote:
Hi all...
Hoping that someone could point me in the right direction.

My parents' Toro gas lawnmower doesn't want to operate.... it will
start running but dies within a second.
I checked the float in the carb and it works just fine, the needle
valve is not stuck and the reservoir has plenty of gas in it.
The engine will only start if I prime it about 5 or so times, if I try
to start the motor without priming it - it won't budge.
I tried different plugs to no avail. However, I noticed that once the
motor starts and dies, the plug is wet, which tells me that the mixure
is too rich.

Couple of questions at this point:
- what does the prime button do? Does it only fill up the float
chamber with gas? Or does it also pump some gas into the engine for
quicker starts?
- do lawnmower carbs have an adjustment somewhere where I can reduce
the amount of gas sucked into the combustion chamber?

Any help would be greatly appreciated.
Alex

Hi,
First thing to check then is air filter. How does the exhaust smoke
look? Newer carbs don't have much in adjustment due to emission control
standard. Try to run it without air filter for temporary.- Hide quoted text -

- Show quoted text -

Hi Tony... sorry about that, I should have also mentioned that I did
run it without the air filter. I can see the throttle valve so I'm
assuming air supply is OK.