ZR-7, GPZ, z750

I took a good look at a zr-7 about 2 years ago at a dealers in Toronto. The bike was used but in very good shape. The engine seemed almost identical to my current ride but a lot smoother - then again it was 20 odd years younger. Performance seemed about the same. It think it was a tad heavier. Handling was good. The sales guy said hp was about 75 which suited me and also for insurance purposes it was not high rated like a crotch rocket. Over all a very nice bike. A more modern version of the old KZ750. Anyway. I decided not to buy and stick with the old beast. Maybe one day when the beast finally dies I'll look for a zr-7.

Take a look here www.zr-7.com/ and see the reviews.

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Woodstock ON Canada
1980 kz750E1, 4->1, K&N pods.

Here's what I'd like to try sometime... z750s w/zephyr bodywork. Old style, new stuff. Forgive the quickie photoshoppin'.

Post edited by: lowbuck, at: 2006/02/14 22:55

Try again...

original

That looks cool

The original ZR-7 of the early 90's up to the point where they threw the old zx-7 motor in the frame are essentially the same as kz, gpz motors. The reason the horspower was done is due to EPA milder cams less compression and CV carbs. A zr-7 motor will bolt into Kz Frame except it does not have the lower mounting lug on the cases in the front. Everything else will pretty much bolt over onto a KZ650 or KZ750 including front end. The rear swing arm was mono shock and also about an inch and a half longer. It has no mounting points for twin shocks. Minor problem. The ZRX 1100 1200 swing arm actually will slide in to the stock frame with the exception of a little shimming. It also is about two inches longer than stock. But you can accept bigger rubber. The front end will also bolt right in with some different sizing on the tapered bearins in the steering neck. The problem now becomes frame twisting with all that moder rubber. The Zr-7 stuff is hard to find. A SV650 front end is identical to the Zephyr and far more easy to find. A lot of racers took the stock front end off for a GSXR front end and have them sitting around.
The ZR-7 motor can be spiffed up by sliding in GPZ pistons and cams. Still available. The Zephyr 550 also benefits greatly from simply putting in GPZ pistons and cams. My wifes Zephyr 550 dynoed at 69 horsepower with this set-up. The pistons slide right in and the cams dropped in. We slotted the cam gears and degreed them up. hope this helps.

Thanks that was helpfull.

hhhmmm! very interesting thread. Do you think zr7 exhaust would bolt up to a kz?

The Gringo has a 2002 ZR-7S exaust "bolted" on his KZ650. I believe all he had to do was make muffler bracket?

Another angle.

jordan wrote:

hhhmmm! very interesting thread. Do you think zr7 exhaust would bolt up to a kz?

Do you mean like this?

Edit: My bad I didn't see that this thread went on to page 2 and Bluemeanie had already answered. Yes you only need to make a rear muffler bracket and use the shorter style of exhaust inserts used on the 750's other than that it bolts right on. Nice quiet system and being stainless it should last forever. It is heavy as heck though.

Post edited by: The Gringo, at: 2008/03/03 07:46

I actually have a ZR7 motor sitting in my storage. I had it as a backup fr my GPz but sold the Gpz in favor of a ZRX. I wish I had both.