100 hp KZ650

Just for reference, here's a pic from the combustionchamber of a 2002 Kawaski ZR-7:


It still has the same design as the GPZ heads...

I bought this head a while ago, and I'm planning on doing some mild porting and skimming, and putting it on my KZ700.

Yep, looks just like the 83-85 GPz750 head.

You don't need to do anything to a KZ650 to get 100rwhp, because Kawasaki did it all for you.

It's called the GPz750 turbo, and 100hp is where it starts...

Lorcan wrote:

You don't need to do anything to a KZ650 to get 100rwhp, because Kawasaki did it all for you.

It's called the GPz750 turbo, and 100hp is where it starts...

Yes you do, you have to locate then buy the GPz750 Turbo

Or let your Nephew buy one and park it in your garage (worked for me)

steell wrote:

Lorcan wrote:

You don't need to do anything to a KZ650 to get 100rwhp, because Kawasaki did it all for you.

It's called the GPz750 turbo, and 100hp is where it starts...

Yes you do, you have to locate then buy the GPz750 Turbo

1 for sale here for only 5100€.....

My standard z650B3 (apart from Harris 4 into 1 and pods with bigger jets) is at last up and running

It goes OK apart from worn bores/rings burning too much oil due to high mileage.

Rather than go for one size over re-bore, I like the idea of freshening it up with Z750 barrels bored to take a Wiseco 810 kit.

I'm not after top end power, but mainly want more mid-range torque.

From this thread it looks like I'll have to open up the crank case openings to slide the bigger z750 liners in.
How much work is involved in this? Machine shop or DIY dremmel job?

Also, can I just bolt my 650 head back on to the z750 810 block with the Wiseco pistons? Any issues with piston/valve/head clearance?

Final question, will the standard carbs be big enough or will they restrict the max torque?

Any answers gratefully received

When the storage box is free I'll post a picture of my 82 GPz 750 head just for the sake of documenting it.

If I have the time I'll measure the cc of the combustion chamber.

Not all that impressed with the midrange on my current setup. Turns out the Zypher went with a mild state of tune and it requires some tweaks to get it up to my expectations.

Compression is 9.5.1? Have to go look at the book again for a spec.

I saw an 85 gpzturbo in Toronto Can., fri . 1 owner $4500. 47000 miles. Looked very good too. Very clean.

I really like the idea of turbo. Can't wait to get my bike done over the winter. Sitting in the garage all lonely with in pieces just waiting to be taken apart to get started with all the details.