A new needle valve assembly is available from Tower Hobby for $18.49. Tower part #LXMW56, O.S. part #26582900, and it is "in stock". It includes the needle valve, the N.V. body, a ratchet spring, and 2 mounting screws. Jester is right, "This little engine isn't worth putting much money into". However, if you can't get your money back, or just want to press forward, then $18.49 more invested will get you a new needle valve and likely fix the engine. Sometimes when we buy used "bargains" we take it in the shorts, and sometimes we make out like a bandit. For comparison a new O.S. 46 LA retails at Tower for $84.98 (40 LA has been discontinued for several years now).