GPZ500S Oil pressure test - adaptor

[B5234FT]

Hi,

I'd like to check the oil pressure on my GPZ and wondered if anyone knew what the proper adaptor was for the port on the lower right of the engine case?

I expected it to be a thread in the casing into a gallery but its like a long banjo bolt with a thread that is approx 13x1.5mm. I'd normally assume imperial, but its a 2002 jap bike....

Thanks

[stinkwheel]

I'd suggest you probably don't need to. Those trochoidal pumps generally either work or they don't.

If you look through the sight glass and press the starter, you should see the oil level drop pretty much as soon as you push the starter button. Thereby confirming your oil pump is by and large working.

The red oil pressure light on the dash IS on a pressure switch on the GPZ500 (it's a level switch on some makes). The fact that it turns off immediately when you hit the starter shows the switch is being held open by the oil pressure. If it was flickering/lagging when you hit the button, THEN you'd be suspicious of low oil pressure (or the exhaust hitting the outside of the switch).

If it had low oil pressure, your cams would already be toast.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[MCN]

I'm not familiar with the engine but if you are determined to measure the oil pressure you 'may' find that there is a test port somewhere on the block. Look for a plug and slacken it. If there is oil on the thread it's 'feeling' oil pressure. If water/coolant comes out then its 'not the plug you are looking for'.

You might be able to determine what side is oil and what side is coolant by looking at parts diagrams.
Or buy a Haynes Book of Omissions for the beast.

If you are determined of course.

As Stinkers says, if low oil pressure then the damage is probably done by now. 😔

https://www.kawasakioriginalparts.com/road-bikes.html
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

[B5234FT]

[MCN]

Remove the plug and determine the thread and use the appropriate fitting to go between your gauge and the block.

Remove the plug and drill and tap to suit your gauge.
Then plug.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

[WD Forte]

Dunno about 2002 bikes, but many oil pressure fittings used a 1/8npt 27 tapered thread.
I used one on my old CX once and it work well enough to test oil pressure.
As MCN says, check the thread first, then look for suitable adaptors

Out of curiosity I checked some oil pressure switches one time and found they opened/closed at alarmingly low pressures, something like 8psi as I recall
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bikers smell of wee

[MCN]

It depends what the manufacturer decides minimum oil pressure and therefore what 'low oil pressure' is.

Some engines do not need massive oil pressure but only need a flow to help cool and replenish hot oil.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

[B5234FT]

As I said in the OP, I've found and removed the test plug and it looks like nothing I've seen before. It's not like a plug, it's like a long banjo bolt and the thread is nothing like 27TPI, more like 18. It's a pretty perfect match for metric 1.5mm, but the diameter doesn't match.

I cant drill and tap, as the thread isnt in the casing wall, its away inside.

I assume that there is a specific adaptor which replaces this bolt and provides an external oil port.

Many switches close at anything down to 3psi (vauxhall) 8psi is common enough on VAG stuff. That's why I asked if anyone KNEW, as 8-10psi at hot idle is survivable, 3 is not.

So, does anyone KNOW the answer, specifically for the GPZ? Because I can not-read-the-OP and guess the answer myself.

Thanks

[B5234FT]

So, big thanks to Stinkwheel for fishing out a KLE500 service manual he had.

I've uploaded the relevant page, but the thread is M14x1.5 and a specific adaptor is required, PN 57001-1209 which looks like this:

https://bikemaster900.de/images/product_images/info_images/57001-1209.jpg

https://bikemaster900.de/All-parts-sorted/-EN-450-GPZ-500-S-Spezialwerkzeug-Oeldruckmessung-Aufsatz-57001-1209-SPECIAL-SERVICE-TOOL-OIL-PRESSURE::12188.html?MODsid=c48ea5b59ba2ce9332a30a8a344bbf68

Which is basically what I feared unfortunately. Now to find a dealer.

[WmY]

Ugh. Still, https://www.bike-parts-kawa.com/tarif_k.php (searchby partno 570011209) might be helpful.