pressure oil z1 900

salve friends somebody has a photo where to driil hole on the oil pump to not form air that diameter thanks

lomolinom@libero.it wrote: salve friends somebody has a photo where to driil hole on the oil pump to not form air that diameter thanks

Do NOT driil hole on the oil pump.

Crankcase air pressure escapes through the oil breather.
The oil breather can be removed and cleaned.





Good Fortune!

Drill a hole in the oil pump??? :blink: :blink: :blink:

That is a whole new level of crazy.........

I suspect the OP's native language is Italian, and that there has been an imperfect translation when asking the question in English.

Hoping the OP's concern doesn't involve the possibility of actually drilling a hole into the oil pump. And it might have nothing to do with the oil breather (which was just speculation on my part).

Good Fortune!

hanks I did not mean the motor vent but we spoke about the engine oil pressure that in the first oil pumps z1 with the three screws it was possible that air was formed in the pump as a result oil spill accent

thanks I did not mean the motor vent but we spoke about the engine oil pressure that in the first oil pumps z1 with the three screws it was possible that air was formed in the pump as a result oil spill accent

Hi lomolinom,
We think we understand what you are asking.

Kawasaki Service Bulletin #4/900-6, dated 1/4/77 refers to a problem with air lock in the oil pump. Among other things, it does indeed instruct to drill a 0.8mm hole at a specified location in the oil pump body, to relieve the air lock. This is an update to the original Kawasaki Service Bulletin #SER73-Z3 dated 11/13/72, that instructs to drill a 1.5mm hole in the pressure switch disk to relieve an air lock at that point.
We cannot post the Bulletins right now, but we can do so tomorrow morning.
Later production oil pumps and pressure switches have the holes present from the factory.

Good Ridin'
slmjim & Z1BEBE

thanks in fact and what I look for my bike and 74 and ask a photo where to drill the hole thank you

Hi lomolinom,
Service Bulletins #SER73-Z3 and #4/900-6 attached.

Bulletin #4/900-6 on page 3 instructs where and what size to drill the hole.

If you can find a later production KZ900 or KZ1000 oil pump the air bleed hole will already be there.

The documentation is unclear when the air bleed hole on oil pumps was implemented from the factory.

EDIT: OOPS...: blush: slmjim seems to have duplicated the file attachments. Fixed.
Z1BEBE will banish him to The Basement aZylum for a period no shorter than that needed to detail her Z-1B and her '93 CB-750 Nighthawk.


Good Ridin'
slmjim & Z1BEBE

slmjim+Z1BEBE wrote: Hi lomolinom,
Service Bulletins #SER73-Z3 and #4/900-6 attached.

Bulletin #4/900-6 on page 3 instructs where and what size to drill the hole.

If you can find a later production KZ900 or KZ1000 oil pump the air bleed hole will already be there.

The documentation is unclear when the air bleed hole on oil pumps was implemented from the factory.


Good Ridin'
slmjim & Z1BEBE

Have downloaded both bulletins.
Only seeing info about drilling hole in the oil pressure switch.
Not seeing anything about drilling hole into the oil pump.
Not seeing a page 3.

Good Fortune!

good what I can do you can help with the hole in the pump

thanks a lot but I also look for pictures of the hole in the oil pump