Sounds very similar to the noise ive been getting, richening the jetting has taken the noise away.
When mine was doing it as loud as that it was scuffing the bore, pull the pipe off and check it's not doing the same to yours
Hopefully it is the pv having a good rattle, have you looked at the pv rod, sometimes they rattle on the cylinder, just a case of tweaking it so it sits clear
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