currently doing 250 ninj carb set & petcock refurbs.
(attached pic of completed, functional petcock, carbset to follow)
Petcock got 1 new mesh filter (upper), all new orings (was able to reuse diaphragm, with new, small oring installed o'course). It tested perfect as OFF seals, ON + RESERVE only flow when vacuum is actuated.
Rebuilding petcocks can be problematic, as such, testing PRIOR to installation is mandatory.
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