I bought My Brother Mike's Kawasaki Z900 off him ,
when I first got it was reluctant to go much over 6000 Rpm .
Changed Oil , Spark Plugs , and found the Air Cleaner to be full of Dirt , Sorted all out and Bike started performing as it should, not a Great Handler .
Gusseted the Frame , Went to a mix of 50% 20W-40 Motor oil & 50% ATF for the Forks , which stiffened the front up a bit. Put Mulholland Rear Shocks on , a lot Better but found the Front Fork angle was wrong ( insufficient Rake , Factory design fault).)\
So when you really tried to lay it down , it would try to come up ,
countered this by when laying it down hold the steering stiff slightly counter steered. Any of you Ladies reading this , can obviously explain how this works to the Men you know!
On a Bumpy Bend , I would just about lift myself up putting more weight on the inside footpeg
which would keep the Bike tracking true.( effectively lower the centre of Gravity)
Met a Mechanic who used to work on Production Race Bike,s and showed me a few tricks they used to bend the Rules, fit Two Inlet Cam sprockets , changing the Cam overlap which made it pull like a Tractor from 500 rpm to 11000 Rpm.
BTW the Honda 900F dodge they Pulled was to replace the Pistons with items from the Honda 6 , same Bore , Higher Compression!
Herman a Friend of Mine, was Part Owner of The Bike Hospital and had a Custom sprayed , Tank , Side-Covers and Tailpiece , which he swapped me , and I fitted a Full Fairing.
One of the Guys at Kawasaki's race team was looking for 900 Barrels , in order to put in 998 cc Moriwaki pistons ( standard 1000 Barrels were actually 1016cc) Swapped me a Brand new Set for mine , Bike was even quicker.
I loved going on Breakfast Runs and would race anything that moved , In retrospect , what a strange Father of 3?
When the Honda 6 came out it was about the fastest thing you could get up to then but My Kawa would easily stay with it. Man that Honda's Motor was Smooth