Normally I wouldn't question this at all, as I wouldn't care. But I just got an FA50 and it has a vacuum activated petcock with RUN, RES, and PRIME. The only position that works is Prime (which is just a constant flow to carb, much like "ON" position on normal petcocks).
I am just wondering if there is a reason I cannot leave it on prime? The float needle in the carb seems to be doing a good enough job of stopping fuel flow once bowl is full.
I have also forgotten to shut off the petcock on normal, non-vacuum activated petcocks and I dont recall it really being a problem then I went to start the bike the next day.
Is there a reason to rebuild this FA50 petcock with new Orings and diaphram or just leave it in PRIME permanently?