Pretty sure these are standard Phillips screws, unlike the JIS screws commonly found in the carburetor. My original petcock floated in a plastic bin of water for 8 years and was super rusted but the screws came out effortlessly with a #2 Phillips… even the smaller faceplate screws which I thought were too small for #2. If this were JIS it would’ve been a recipe for disaster!
Excellent job on the petcock resurrection! It is too bad that they don't always put the "dot" on the JIS screws so it is hard to confirm. I was very suspicious that the screws were JIS as the rear screw drive depth looked too shallow to be a conventional Phillips but I could be wrong. I remember reading that Japanese automotive suppliers and assemblers do not mix and match in the plant to prevent manufacturing and dealer confusion and quality issues, so they generally keep all of the "cross style" fasteners as JIS which makes sense as I remember the late 1970s GM vehicles that had mostly metric drivetrains, but the Fischer bodies were still all imperial causing repair shop mayhem!
@@andrew_ball yeah that does make sense. If they are JIS then perhaps I got lucky because they weren’t brass like the notorious carb screws. They were very rusted and crusty though, so I was very surprised when they turned almost effortlessly. On the other hand, the screws that secure it to the gas tank were much too tight. They had Philips and 10mm nut heads but I couldn’t turn it with my Phillips or by 10mm but driver… only with a box wrench.
Is that plastic block necessary? My plastic gasket between the rubber pieces of the diaphragm has a hole in it and fuel squirts out of there all the time. I can’t seem to find that plastic block anywhere though, as all these petcock kits only come with the rubber diaphragm. Would you know where to source one for a kz550? And again, is it even necessary?
Hello there, sorry I missed your question here. The plastic block is necessary as the spring and diaphragm both seat into it and the plastic block should have a hole at the bottom to allow the diaphragm to "breathe" as it strokes back and forth. If fuel is dripping out of the hole I would suspect that the diaphragm has a hole or tear in it. If your plastic block has cracked or been lost it is possible to get an OEM replacement from the dealer, but I have seen entire petcock assemblies for sale on Amazon and Ebay, but they are likely somewhat generic. Best wishes and good luck!
Pretty sure these are standard Phillips screws, unlike the JIS screws commonly found in the carburetor. My original petcock floated in a plastic bin of water for 8 years and was super rusted but the screws came out effortlessly with a #2 Phillips… even the smaller faceplate screws which I thought were too small for #2. If this were JIS it would’ve been a recipe for disaster!
Excellent job on the petcock resurrection! It is too bad that they don't always put the "dot" on the JIS screws so it is hard to confirm. I was very suspicious that the screws were JIS as the rear screw drive depth looked too shallow to be a conventional Phillips but I could be wrong. I remember reading that Japanese automotive suppliers and assemblers do not mix and match in the plant to prevent manufacturing and dealer confusion and quality issues, so they generally keep all of the "cross style" fasteners as JIS which makes sense as I remember the late 1970s GM vehicles that had mostly metric drivetrains, but the Fischer bodies were still all imperial causing repair shop mayhem!
@@andrew_ball yeah that does make sense. If they are JIS then perhaps I got lucky because they weren’t brass like the notorious carb screws. They were very rusted and crusty though, so I was very surprised when they turned almost effortlessly. On the other hand, the screws that secure it to the gas tank were much too tight. They had Philips and 10mm nut heads but I couldn’t turn it with my Phillips or by 10mm but driver… only with a box wrench.
thanks....... helpful .....
My pleasure, thank you for watching!
Is that plastic block necessary? My plastic gasket between the rubber pieces of the diaphragm has a hole in it and fuel squirts out of there all the time. I can’t seem to find that plastic block anywhere though, as all these petcock kits only come with the rubber diaphragm. Would you know where to source one for a kz550? And again, is it even necessary?
Hello there, sorry I missed your question here. The plastic block is necessary as the spring and diaphragm both seat into it and the plastic block should have a hole at the bottom to allow the diaphragm to "breathe" as it strokes back and forth. If fuel is dripping out of the hole I would suspect that the diaphragm has a hole or tear in it. If your plastic block has cracked or been lost it is possible to get an OEM replacement from the dealer, but I have seen entire petcock assemblies for sale on Amazon and Ebay, but they are likely somewhat generic. Best wishes and good luck!