|We dug up the performance stats
for the ancestors of the ZR-7 as well as some close relatives.
These might be of interest to some moto-history buffs.
They were obtained from period road tests.
The times have been rounded to the nearest tenth of a second and to the nearest
mile per hour for clarity, as some of the old road tests timed to the thousanth and some
just to the tenth of a second.
1/4 mile elapsed times and terminal speeds were timed at:
It is interesting to note that over a 20 year
period the 1/4 mile times and terminal speed of the KZ-ZR series varies by only .5 seconds
and 4 miles per hour. This is well within the range one would expect even taking the same
bike to different drag strips with different riders. This reflects a close parity
(horsepower wise) between all the listed models (the GPz Turbo is not directly comparable,
as it was intended to compete with the open class bikes of the time).
There is a difference in final drive gearing between these bikes, for example the
1981 KZ750 was turning 4500 rpms at 60 mph. The 1983 GPz750 was at 4400 rpms at the
same speed. The difference between the 1991 750 zephyr and the 2000 ZR-7 is even
greater. 750 Zephyr 4800 rpms at 60 mph. The ZR-7 is only turning 4050 rpms at 60
mph. You can see this reflected in the 1/4 mile elapsed times, with the Zephyr
having the edge.
The road tests of the Zephyr 750 show it making about 60 HP at the rear wheel and
most tests list the ZR-7 between 65 and 70 HP.
The relevance of this history lesson to us ZR-7 owners can be seen by looking at
your engine serial #, It begins with KZ 750.
Contributed by D.B. Orr