It is proven the auto petcock is unreliable. Hence the proliferation of rebuild kits and manual replacements.
Besides the real problem is the poor design of the float valves.
well well, well.. bravo.
the auto/vac petcock works well...its the carbs that reall mattered...
actually until the Conccours was produced, (ne it's predecessor the veritable Ninja), we who owned Kaw bikes dealt with
MIKUNI CARBS.... SLIDE CARBS....
No Diaphragms..., STEEL FLOAT NEEDLES sitting on BRASS SEATS..... all the wayback to the 60's.....
the redsign of the format using VACUME ASSITED THROTTLE SLIDES FOR ACCELERATION was the down fall of the modern bike; this provoked the VACUME ACTIVATED FUEL VALVE... which while a good design
if USED DAILY, created problems on bikes stored for decades... (who would store a bike that long?...... about 50,000 people evidently..)
with the redesign came the polymer tipped needles, which when a piece of grit rested in the rubber/brass seal area, embededded into the rubber... holding off the seat, and allowing fuel flow...., this rarely happened with the MIC's, and if it did, they overflowed and dumped fuel on the ground....(a-la- the SISF mod...), this didn't solve the problem, but it sure as HELL made it evident there WAS a problem..... and NO HYDRO-loks occured as a result.
C14 Cannot Hydro.
I like that.
COGZILLA needs a rod Job...
I don't like That,
BIG bore time.