Racecrafters project pics.

zed1015 wrote:

On the left is the supplied rotor mount for the large taper non keyway MK2, J and GPZ cranks.
And on the right is my rotor adaptor for the earlier keyed crank which i made using a modified steel core with key slot from a spare z900 rotor i had.
 

 

I found these pages, which look to be the systems you mention:

www.electrexworld.co.uk/acatalog/Kawasak...-3110--RPK_3110.html
www.electrexworld.co.uk/acatalog/RPKS-31...ternator_System.html

The manufacturer only mentions compatibility with 1981 and later "J" model derived engines.

However, you also mention the "Mk2" crankshaft.  Can you confirm that this kit is compatible with the 79-80 KZ1000 Mk2 crankshaft and engine cases?

DOHC wrote:

I found these pages, which look to be the systems you mention:

www.electrexworld.co.uk/acatalog/Kawasak...-3110--RPK_3110.html
www.electrexworld.co.uk/acatalog/RPKS-31...ternator_System.html

The manufacturer only mentions compatibility with 1981 and later "J" model derived engines.

However, you also mention the "Mk2" crankshaft.  Can you confirm that this kit is compatible with the 79-80 KZ1000 Mk2 crankshaft and engine cases?

Yes! it fits the MK2 crank.
I'm going to use another on my turbo build below which i have a MK2 crank for and all the big aircooled fours use the same alternator case bolt pattern so the cover will physically fit all Z1 through to GPZ1100.
If you are considering buying the enclosed 3112 version there is a design fault and the outer cover doesn't block off the main oil gallery like original does so you will have to make a bung to stop the oil short circuiting back to the sump rather than feeding the head and it is also worth checking the rotor alignment to ensure the stator winding sits central in its magnetic field to ensure maximum output.

Here's a link to page 15 of my build thread over on the Z1 forum which shows the oil gallery bung etc .
Double the troubleZZ. AMA style Racecrafters Z1000 (completed) and Moriwaki Z1R Turbo. - Page 15 - Z1OwnersClub GB