Fuel petcock question
(NOTE: I don't want a Pingel petcock; I want to use a vacuum operated unit.)
I do have two KZ1000J here with OEM petcock that works perfectly so I know those vacuum operated units can fulfill their goal.
I'm currently restoring a 1983 KZ750L that have a leaking OEM petcock ("reserve" and "on"). "Prime" works as it should. I first tried to replace it with a complete (eBay chinese) one but it also leaked as described above. I took the OEM unit apart (rubbers were worn out) and installed the chinese's inners inside the OEM one (after a deep cleaning). Same leaking. I even shimmed the vacuum spring for a stronger closing force but it leaked up to the point it could not open anymore under vacuum…
Then, I ordered a petcock repair kit (still eBay chinese) that I received today. I installed it and same leaking. After a few (well, more than a few) curse words, I don't know what to do next.
I do have another spare OEM off a 1982 1000J that I could try to use (possibly with that repair kit I received today) but I'm not optimistic…
Are Chinese really unable to make leakproof petcock or repair kit? Does only OEM parts that works? I could order OEM's 43028-1015 diaphragm but will it work?
This 750 is a bike I intend to sell so I don't want to spend a ton of money on it.
Kawasaki 43028-1015 - TAP DIAPHRAGM | Partzilla.com