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Discussion Starter #1 (Edited)
I just installed a brand new Oregon 50-642 on my Tecumseh HMSK80. It is leaking gas from the main adjustment screw on the bottom of the bowl. The bowl is dry and its not leaking from the fuel hose (I closed the fuel shutoff valve).

Any thoughts (besides return it)?
 

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Discussion Starter #3 (Edited)
I took it out and there is an o-ring and the gasket. I flipped the or ring over and re-installed. I will keep and eye on it.

Update - still leaking. I will get a new o ring for it.
 

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Another thing to consider is that the threads make a fairly poor sealing surface. Putting some epoxy or other gas-resistant stuff onto the lower-most threads where that O-ring rides to make a smooth surface might help it seal better. The original adjustment needle on my Tecumseh carb has a smooth area for the O-ring to seal on. The replacement has threads in that area. The replacement was impossible to seal, so back to the cleaned-up original main jet adjustment needle it was.
 

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As sciphi said you may have better luck reusing the original needle. The o-ring needs a flat surface on the face and a smooth surface on the ID. If there are threads for it to seal against on on the ID you are asking too much from a conventional o-ring. I doubt a new o-ring will solve the problem. Make sure the bowl is relatively flat on the mating surface and there is not debris present. The spring needs to have ample tension too!

good luck.
 

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Post #2 illustrates the issue I had nicely. The O-ring has to seal against the solid area on the adjusting needle. If it's not available, it can be made, or the original re-used after cleaning.
 

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Discussion Starter #9
We haven't had snow in 3 weeks so I have been ignoring the snowblower. Its -27 C right now so I will wait for warmer weather to check the bowl and all mating surfaces.
 
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