Thanks all - seems to have gone away completely now, only thing that changed is I've risen in altitude. Could have been just a bad tank of really bad fuel, as if it could get much worse in Bolivia!
Back of Beyond, the ringing bell analogy is very apt - would definitely agree it sounded like that!
Mollydog, if the pilot fuel screw only effects idle, why do people recommend turning in inwards when rising in altitude?
Cheers!
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