Originally Posted by
1QwkSport2.5r
I run regular muffler pressure on all of my engines except one or two (no muffler). Some of my Super Tigre, both K&Bs, and my Enya .30 all leak a little fuel from the needle.. My ST S29 is probably the worst. They do not have O-rings in the needle holders or on the needles themselves like other companies do. At least not on the Carburetors I have.
For the engine that I just dumped for peeled cylinder liner, it had an o-ring on the HSN. This o-ring got sliced once when it somehow expanded and then got cut by the spraybar. Anyway, the engine ran terrible after that, but I suppose it must have been because the needle would rotate from the vibrations and lean out. The LHS had those o-rings in stock and was an easy fix.