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Posted by donald girod on July 1, 2006, 10:09 am
I have a Briggs lawn mower, solid state ignition. It runs normally
(good power, etc) once it starts, and it starts eventually, BUI...
I have to pull many, many times, and after a while the engine starts to
fire weakly. It will fire weakly 10 or 15 times and die, each time
doing a little better. Finally, it fires weakly, doesn't die quite, and
slowly picks up speed. Then it takes off and runs. It will restart
readily when warm, but if left even 10 minutes, it reverts to the
painful starting. The spark is strong (obviously), and I can see gas
splash up in the carb throat when I take the air cleaner off and pull
the rope. When it does start, it does NOT throw black smoke, as it
would if the carb was seriously loaded up with gas, in fact, it throws
no smoke at all, and I would bet that in fact it has been starving for
gas. Maybe.
I have seen other Briggs engines do this, and I have never figured out
what the problem has been. I have done things like take apart the carb
and put in a carb kit (mainly, new diaphragm gasket or whatever that
thing is called), and sometimes I have "cured" the problem. But if
somebody recognizes this syndrome and can tell me what the most likely
problem is, I would surely appreciate it.
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Posted by Dan Espen on July 1, 2006, 10:17 am
> I have a Briggs lawn mower, solid state ignition. It runs normally
> (good power, etc) once it starts, and it starts eventually, BUI...
>
> I have to pull many, many times, and after a while the engine starts
> to fire weakly. It will fire weakly 10 or 15 times and die, each time
> doing a little better. Finally, it fires weakly, doesn't die quite,
> and slowly picks up speed. Then it takes off and runs. It will
> restart readily when warm, but if left even 10 minutes, it reverts to
> the painful starting. The spark is strong (obviously), and I can see
> gas splash up in the carb throat when I take the air cleaner off and
> pull the rope. When it does start, it does NOT throw black smoke, as
> it would if the carb was seriously loaded up with gas, in fact, it
> throws no smoke at all, and I would bet that in fact it has been
> starving for gas. Maybe.
This may be too simple, but it sounds like you are not pushing
the primer button the required number of times.
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Posted by donald girod on July 1, 2006, 10:50 am
Dan Espen wrote:
>
>> I have a Briggs lawn mower, solid state ignition. It runs normally
>> (good power, etc) once it starts, and it starts eventually, BUI...
>>
>> I have to pull many, many times, and after a while the engine starts
>> to fire weakly. It will fire weakly 10 or 15 times and die, each time
>> doing a little better. Finally, it fires weakly, doesn't die quite,
>> and slowly picks up speed. Then it takes off and runs. It will
>> restart readily when warm, but if left even 10 minutes, it reverts to
>> the painful starting. The spark is strong (obviously), and I can see
>> gas splash up in the carb throat when I take the air cleaner off and
>> pull the rope. When it does start, it does NOT throw black smoke, as
>> it would if the carb was seriously loaded up with gas, in fact, it
>> throws no smoke at all, and I would bet that in fact it has been
>> starving for gas. Maybe.
>
> This may be too simple, but it sounds like you are not pushing
> the primer button the required number of times.
Yep, too simple. It has no primer button. This is not a new mower.
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Posted by David Martel on July 1, 2006, 11:50 am
Don,
Dan may be right that your engine is not getting enough gas. Check for
possible vacuum leaks around the carb by spraying carb cleaner at obvious
connections while the engine is running. If there's a vacuum leak the engine
will suck in the cleaner and stutter or die.
Also, check the needle valve adjustments. My guess is that you've
adjusted the carb too lean or air is entering by a vacuum leak. These are
both easy to fix.
Dave M.
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Posted by donald girod on July 1, 2006, 12:31 pm
David Martel wrote:
> Don,
>
> Dan may be right that your engine is not getting enough gas. Check for
> possible vacuum leaks around the carb by spraying carb cleaner at obvious
> connections while the engine is running. If there's a vacuum leak the engine
> will suck in the cleaner and stutter or die.
> Also, check the needle valve adjustments. My guess is that you've
> adjusted the carb too lean or air is entering by a vacuum leak. These are
> both easy to fix.
>
> Dave M.
>
>
I've never touched the carb, but a vacuum leak is plausible--something
could have shaken loose. It would also be easy, as you say, to open the
needle. I'll try this. The problem has developed gradually.
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