Specs for KZ650B1:
Specifications: B1
Type DOHC 4 cylinder, 4 stroke, air-cooled
Bore and stroke / ccm 62 x 54 mm / 652
Compression ratio 9.5:1
Maximum horsepower 64 HP @8,500 rpm
Maximum torque 5.8 kg-in @7,000 rpm
Carburettors Mikuni VM24SS
Dry weight 211 kg
Overall length US 2,170 mm, European 2,220 mm
Wheelbase 1,420mm
Fuel tank capacity 16.8 L
KZ650 Specs
211 kg = 467 lbs
4.42 Gal og gas @ 7.1 lbs per gal = 31.38 lbs
1 gal oil = 7 lbs
Battery = 3 lbs
So the wet weight on a 77 KZ650B1 should be ~ 508 lbs.
I think a four into one exhaust is about 20 lbs lighter than the stock exhaust.
The 79 KZ650SR may be a little heavier because of the cast wheels, and the GPz750 motor may be a little heavier than the KZ650 motor, I suppose that could account for the 480 lb dry weight.
I weighed 19" spoke and mag wheels and the spoke wheel was 2 lbs lighter.
An aluminum swingarm would help, as would a lighter front end off a newer sportbike, and swapping to 17" aluminum spoke wheels would help. I think you could get it down to a 400 lb dry weight but it's not going to be easy or cheap
There is a possibility that the 480 lb dry weight for the KZ650SR with the GPz750 motor was actually a wet weight. My nephew and I weighed several bikes that day and the 650SR was the only one with no gas or oil in it, so I may have added in the weight of the gas and oil to arrive at that number. We did that last summer and my memory is not as good as it once was
Post edited by: steell, at: 2006/02/02 11:17