Quote:
Originally Posted by johnbuckley
Yes a sloppy shaft can allow air air to be drawn through it ( especially at idle) making the mix weaker, having said that I'll add ....if it runs OK it is Ok!
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Yes, this is very true. Adding to the comment, the way you control the engine speed is by controlling the air, -not the fuel. Leaky shafts will not allow an engine to idle down low. Also, carburetors that have leaky shafts will not idle well and can contribute to stalling issues on quick deceleration.
One note of caution is you really do not want to
drill the housing bore but instead you need to ream it to size. I actually have modified a large angle plate where I can bolt the upper house to the angle plate to index it vertically, and then it is easy to ream it with the Mill if your head is trammed in correctly.