750 Spectre rebuild

How about some photos of the running surface of the bearings?

I'm repeating myself here but the color code is a paint mark that's on the edge of the bearings. A paint mark: brown, blue, black

Attached are pics of the top and a side view, sorry but I can not see any paint dots on these. I really do appreciate your responses.

Mike

Humm, no paint marks then. Strange. That must mean the standard configuration (whatever that is).

Most of those bearings don't look too bad. One of them seems to have some scoring from debris in the oil. I've seen way worse that ran fine.

No eBay APP ID and/or Cert ID defined in Kunena configurationHello Mike

As fare as i can investigate your crankshaft main bearings are used in the following Kawasaki models.

Z440 (KZ440)
EN500
EX500 (GPZ500S)
Z650 (KZ650)
Z750 (KZ750)
EN500 (A2/5/6)
Zephyr750 (ZR750)
ZX900 (ZX-9R Ninja)
ZX1100 (Ninja ZX-11)

Source

www.scheuerlein-motorentechnik.de/motorr...gerschale-z750e.html

www.scheuerlein-motorentechnik.de/motorr...4iu23ng60mqhn088khb6

or a used crank with rods and main bearings for 79,90 EURO





I don´t know why your color code is disappeared, check your crank for tolerance marks do a plastlage for the bearing tolerance



Michael

Sorry, i forgot some pics with exact measurements for Plastigauge



Michael

I also ran into the issue of my connecting rod bearings being "out of stock" when I was assembling my kz750 motor. So I found that the 2001-2005 zr-7 used the exact same bearings only the color coding for the sizes was different. They were identical to the kz750 bearings in every way.
Now that I have already finished my engine, I have noticed that Kawasaki has merged the part numbers for the crankshaft main bearings ( The bearings made from 1983-2009 onward were made of a different mixture of metal and therefore had different part numbers) and the old kz750 main bearings were twice as expensive than the others. Now the 1980 all the way up to the 2009 use the same bearing part number.
But if you need a green coded rod bearing you can order the blue zr-7 rod bearing instead.

kz750 bearing sizes and color code


zr-7 bearings and color code


I also had some of the colors missing from my bearings, but if you follow the factory system of crankshaft, connecting rod and engine case markings, its simple to figure out which bearings you need.

Some great into here from Daftrusty and Scirocco. Humm, when in doubt, look in the manual!

When rebuilding my 750 I compared the bearings against those from a parts engine I got and all were blue color code. Then I just selected the best 8 shells out of the 16 I had available to me. Most of the originals were in good shape. Just some light scuffing which doesn't matter. There were a couple with deepers marks though that got replaced.

Scirocco,

Thanks for all of the information. After measuring everything I know now which bearings I need. By the way, which manual are the pictures from? I have the Haynes one and it is not as descriptive as the one you are showing here.

Hello spectre65

Its a full service manual with 426 pages (sixth edition Aug 9, 1985)



I get it from here

www.750turbo.com/manuals/

GPz750_Base Manual.pdf

Michael