On Apr 4, 7:20*pm, "PrecisionmachinisT"
wrote:
"Steve W." wrote in message

...





PrecisionmachinisT wrote:
"Phil Kangas" wrote in message
...
"PrecisionmachinisT" wrote in message
news:RYSdnWJG89YYsAfQnZ2dnUVZ_oWdnZ2d@scnresear ch.com...
"Karl Townsend" wrote in message
m...
Got my gravely rebuild all finished today. Engine runs fairly smooth,
carb. leaks at idle. So, I ordered a rebuild kit as a new carb. is
over $100.

I can see the bushings the throttle butterfly shaft rides in is all
shot. Anybody ever bored and pressed in something to repair this
common problem?

Probably doesn't affect the air/fuel ratio enough to even bother with.
That'll raise hell with the idle mix and idle speed.

Well no ****, Sherlocks...

Which explains quite perfectly why carburetors typically have adjustable
throttle stop and idle mix screws to begin with...

Not on 99% of small engine garbs, you have an idle screw only and the
bushing wear cannot be compensated for because it will alter the mix
depending on the position of the throttle.

Pretty sure virtually ALL of mine do--I will have a look later.





But as I already said, probably there isn't enough wear at the butterfly
that it can't be satisfactorily adjusted...

Adjusted with what. there are no adjustments to compensate for the wear..

But to be perfectly clear, suggest one should first attempt at
adjustment...

Next, (and only if indicated) should one consider reaming, bushing
install and turning down the shaft.

Why? This is a VERY common repair and the kits are available to repair the
problem very easy. Usually the repair includes a new shaft, two bushings a
pilot bit and a small amount of epoxy.
You grind the stakes off the screws that hold the butterfly.
Remove the screws and butterfly.
Slide the butterfly out and remove the shaft. Then drill the body out.
Next you CLEAN it very well.
Mix the epoxy and apply it and press in the new bushings.
Coat the shaft with release agent and install it to align the bushings.
Let the epoxy cure. Remove the shaft and clean it, apply a dab of lube,
install the butterfly, stake the new screws.
Install the carb. Enjoy.

Unless of course, he has nothing better to do with his time than to
possibly **** up what had previously happened to be a perfectly
servicable carburetor...

--
Steve W.- Hide quoted text -

- Show quoted text -- Hide quoted text -

- Show quoted text -

Hi....
New (old) guy, here. I have dealt with this one plenty of times. You
have a few good sugestions above. Often it's not worth bothering with.
One thing, though: see if the throttle return spring is contributing
to the shaft/bushing wear with too much side pressure. Often you can
modify the spring arangement either by adding an additional spring on
the other side of the shaft, perhaps replacing the original spring
with a lighter one one each side. A rotary spring (clock spring)
around the shaft would do it too.
Sam Moore