Holy diaphram, batman

[Patrick62]

Yesterday I was out cutting with my 064 (frankensaw) and It usually runs ok, but things were getting a little more strange as I was cutting.
It would usually idle ok, but as it's sitting there it is loading up with fuel. Pick 'er up, and it's really running rich for a bit then clears out. a little while later it is running lean.
So I am thinking as I am cutting this has to be something with the needle and diaphram.

Last night I take it apart, and find liquid fuel on the dry side... now, how did that get there
Put it together with new parts, and after breakfast I might go and try it again! I bet it behaves a LOT better now.

 

[Patrick62]

Anybody who has ever messed with these carburetors will know what I am talking about here:

So, ok. back together, and head out to the wood pile. Saw won't start. Won't even pop.
Pull the plug, dry as a Nabisco cracker. Ok. No fuel. It isn't pulling from the tank.
Back to the bench. Took it apart, all looks good. Try it again. Still nothing.
Back to the bench and look it all over AGAIN. This time I had a idea. You should have seen this
carburetor with metering diaphram and needle removed, pump cover installed.
Little hose into a cap full of fuel, another hose to the operator. me. Keep messing with it, pulsations cause the diaphram to wiggle, and I can see if the fuel is moving. More messing with it. Eventually, I get it to prime, and squirt out the other side!
Put it back together, and it started. Took it to the wood pile and blocked out a tank. This saw has not run this strong in awhile.

Never ran into that before, but if I ever do again I will build a small pulse motor, would not take much...

 

[huskihl]

Fill the saw with fuel and give it a shake. The excited fuel tries to evaporate and creates pressure in the tank resulting in starting with quite a bit fewer pulls