ORIGINAL: Hobbsy
Turk, your engines must be unusual or your fuel is of poor quality, the Fox Miracle plug will work in any engine from a Saito .30 to a Supertigre 4500. If I have any problem with any engine I put a Fox Miracle in it and it works a Miracle.
But how can they work well with OS 4 st.or OS #8 on same fuel?(I have 7 engines).None of them works with Fox.