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Ducati Meccanica
Posts: 2,527
Join Date: Sep 2004
Location: Pulborough, W. Sussex
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Could be the air screws - remember the std setting is waaaay too lean, screw it out at least 3 turns more than std. (the std setting can sound as if its an air leak, its so lean)
And the o-ring on them can get damaged ... it can come off, but stay 'inside' when you take the screws out, and then get damaged and flap about a bit when you put the screws back in.