OK so here's the bit where I get really curious. According to Victa, the current parts catalogue, which I don't have, unless the last one they released for the PT's was the Feb 07 one, which would make sense, considering the engine and other components haven't been changed since then, but I'm not a Gold dealer so I don't have access to their back-end stuff. If, according to Victa, which was confirmed by a Victa technician when I called up previously for assistance on something, all of their current parts for those engines should be backwards compatible and whole unit replacements (I.e, if you want to replace part of the carby, buy the whole carby, it will be the only replacement part they officially sell), which would include the decompressor. So... If the current decompressor is the model which should be used as a whole unit replacement for any of the previous models, and the current model decompressor does not have that restrictor valve... Is there something else we're missing? Or does someone need to reach out to Victa and let them know they may have made a whoopsie..?