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Tyrell Corp wrote: (hi Lou - Brendan here )

Thought I recognized that bike!
...and the more human than human humor.

Yea - nexus 6 replicant combat model (smiley)

evil-ride wrote: Zaddict
I live in Tokyo Japan.
You have nice 550.
I read the thread.
It is very difficult to install 4 valve to 2 valve Engine.
Because piston forms and crankshaft..etc very different.
If you want more power,use the Wiseco piston and Keihin or Mikuni flat-valve carburetor.
I think Flat-valve cab is very effective for ZR.
Please use the link as a reference(Please use Google transfer)
www.mars.dti.ne.jp/~tu-121/
I wish want to help you...

Thank you for all the information, Evilride. It's a shame that it's so difficult to change to a 4 valve engine - that would have been a fun project. But I did see some interesting modifications in the link you shared, including a modified 650cc engine (www.mars.dti.ne.jp/~tu-121/). 73 horsepower would be amazing!! :woohoo: Is there a kit to buy or was that project all custom work? I have only seen Wiseco 615 kits before.

evil-ride wrote: Is the KZ series major in USA?

Yes, the KZ line was very popular in the US. The Z1 and Z900 are legendary bikes. Most people who know anything about motorcycles know about these.
The Zephyrs were not as popular here. They were only sold for a couple of years, so they are very rare. There is a nice forum dedicated to just Zephyrs you might like, though there aren't many people on it just because there aren't that many Zephyrs left on the road. www.zephyr-zone.com/cgi-bin/yabb2/YaBB.pl

Thank you for all the information, Evilride. It's a shame that it's so difficult to change to a 4 valve engine - that would have been a fun project. But I did see some interesting modifications in the link you shared, including a modified 650cc engine (www.mars.dti.ne.jp/~tu-121/). 73 horsepower would be amazing!! :woohoo: Is there a kit to buy or was that project all custom work? I have only seen Wiseco 615 kits before.[/quote]

I am very glad to help you.
There was a TAKATORI 650cc kit,but now we could not get the kit .Because of ZR series stopped production.
ps-takatori.com/boaup/boaup-kawasaki.html
Now in japan, there is only two way of bore-up.
1: POSH High-compression 510cc kit.
2:Bring own bike to Technical Pro shop.
himeji-gs.com/
This shop makes 710cc!! The price is about 7000 USD.
So I think use the wiseco kit is the best way.And then use gpz 400 cams is better.
Or,,,there were Yoshimura Stage 1 High-cams for 2 valve before.But now it is sold out.
I found the last 1 set at shop.If you need that, I send to you

Yes, the KZ line was very popular in the US. The Z1 and Z900 are legendary bikes. Most people who know anything about motorcycles know about these.
The Zephyrs were not as popular here. They were only sold for a couple of years, so they are very rare. There is a nice forum dedicated to just Zephyrs you might like, though there aren't many people on it just because there aren't that many Zephyrs left on the road. www.zephyr-zone.com/cgi-bin/yabb2/YaBB.pl[/quote]

Thanks your information Zaddict I saw the links,will entry after
Now in japan, we import the KZ line from USA.Because Kawasaki didn't supply 750cc over in japan.
I want KZ line but it is very high price (maxim about 70000 USD ) I wounder that US riders how to get the KZ.

evil-ride wrote: I wounder that US riders how to get the KZ.

I dug my 750 out of a sand dune in the desert.

My brother gifted me his basket case KZ1000 Police. ("Basket case" meaning disassembled, with the pieces in several boxes or baskets.)

Also, sorry for the threadjack...

I want to dig up KZ in desert
Z1000P....I have seen the bike only one time.
Your 750 pipes looks nice!I imagine that sounds great.
Threadjack...me too.sorry.

evil-ride wrote: Now in japan, we import the KZ line from USA.Because Kawasaki didn't supply 750cc over in japan.
I want KZ line but it is very high price (maxim about 70000 USD ).

Oh, wow, that's incredible. Sounds like a potential export opportunity for people on this site with Zs...though it might be hard convincing them at any price..

evil-ride wrote: himeji-gs.com/
This shop makes 710cc!! The price is about 7000 USD.
So I think use the wiseco kit is the best way.And then use gpz 400 cams is better.
Or,,,there were Yoshimura Stage 1 High-cams for 2 valve before.But now it is sold out.
I found the last 1 set at shop.If you need that, I send to you

710cc!! and $7000!! Both figures are shocking. I couldn't find any information on performance. How much power does a 550 engine put out when bored to 710cc? Does the engine last more than three seconds?

I'm curious about the Yoshimura Stage 1 High-cams. Please send more information. There is a shop here in California that grinds performance cams for KZs, GPZs, ZRs - Megacycle. There is a member on this forum (Corey - he posted earlier on this thread) who modified his GPZ 550 with a Wiseco 615, K&N pod filters, Megacycle Cams and Moriwaki race exhaust and now gets about 80 hp (at the crank, 65hp at the wheel).