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Posted by ballpark on January 31, 2006, 7:40 am
HI,
I am fixing a Toro Super Recycler (20043) for a friend. It's has a 6hp
Briggs engine. It has no throttle (auto throttle?). I have replaced
the plug, fuel line, and air filter. I also rebuilt the carb including
new gaskets. I cannot get the mower to start. If I add a few drops of
gas into the cylinder then it starts right up and runs like a champ. I
can even shut the mower down and it will start right up again. But if
you let it sit for a day, it will not start again.
Its a primer system but its an odd setup as the primer bulb is on the
air filter.
The throttle / governor seems odd to me also. A spring pulls in one
direction holding the throttle open while a air vane on the engine
pulls the throttle closed. So while running the throttle is in
equilibrium between the two. The odd thing about the setup is that
when you are starting the engine, the throttle is wide open.
Any suggestions?
Thanks in advance.
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Posted by Brad on January 31, 2006, 8:17 am
The governor is typical for many small engines that run at one speed.
It sounds like this engine is not getting the extra fuel it needs to
start. Check if there is a choke that is not working. If there is no
choke then the primer is the only means of adding the extra fuel, be
sure the primer is delivering fuel. A small crack in the primer bulb
can really limit the fuel delivered.
Brad
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Posted by ballpark on January 31, 2006, 9:08 am
The bulb is fairly new. It does have a small hole in the center
though. (It's supposed to be there.) When you push the primer bulb,
air is pushed though some channels in the back of the air filter
between the air filter and a gasket. The gasket is new. I think the
air then blows into a small hole slightly pressurizing the fuel and
pushing vapor out of an even smaller hole into the intake. (or maybe
using the venturi effect)
That makes sense though that something is not quite working in that
area. I know the holes in the carb are clean, but I think I could
clean up the primer system a little better.
Quick question: Do I need to oil that gasket? it seems like it would
make it more air tight and increase the amount of air getting to the
carb?
I will post tonight on what I find out.
Thanks for the help.
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Posted by Jeff Wisnia on January 31, 2006, 10:37 am
ballpark wrote:
show/hide quoted text
> The bulb is fairly new. It does have a small hole in the center
> though. (It's supposed to be there.) When you push the primer bulb,
> air is pushed though some channels in the back of the air filter
> between the air filter and a gasket. The gasket is new. I think the
> air then blows into a small hole slightly pressurizing the fuel and
> pushing vapor out of an even smaller hole into the intake. (or maybe
> using the venturi effect)
>
> That makes sense though that something is not quite working in that
> area. I know the holes in the carb are clean, but I think I could
> clean up the primer system a little better.
>
> Quick question: Do I need to oil that gasket? it seems like it would
> make it more air tight and increase the amount of air getting to the
> carb?
> I will post tonight on what I find out.
>
> Thanks for the help.
>
As others have already said, that air pressure should be causing some
fuel to squirt into the carb's intake passage.
I haven't personally encountered a primer bulb with a hole in it, but
probably it's covered by your thumb when pushing it and is there to let
things equalize when you're not.
My best guess is that maybe there's a tiny valve ball or sumpin' like
that in the carb which might be stuck closed, or maybe even fell out
unoticed when you rebuilt the carb.
Might be you're going to have to open up that carb up again and compare
things with an accurate exploded view of all its parts to figger out why
show/hide quoted text
the primer isn't having its expected orgasm when you push on its bulb. <G>
Jeff
--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
"Truth exists; only falsehood has to be invented."
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Posted by ds549 on January 31, 2006, 9:37 am
look in the carb while yo push the primer ,you should see a spirt of gas
,if not,primer isnt working right.
http://www.minibite.com/america/malone.htm
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> though. (It's supposed to be there.) When you push the primer bulb,
> air is pushed though some channels in the back of the air filter
> between the air filter and a gasket. The gasket is new. I think the
> air then blows into a small hole slightly pressurizing the fuel and
> pushing vapor out of an even smaller hole into the intake. (or maybe
> using the venturi effect)
>
> That makes sense though that something is not quite working in that
> area. I know the holes in the carb are clean, but I think I could
> clean up the primer system a little better.
>
> Quick question: Do I need to oil that gasket? it seems like it would
> make it more air tight and increase the amount of air getting to the
> carb?
> I will post tonight on what I find out.
>
> Thanks for the help.
>