The Z900RS is built primarily with aluminum. Aluminum is soft. If you over-tighten the engine mount bolts or the axle pinch bolts, you will strip the threads. Helicoils are expensive.
2.3 to 2.4 liters including the reserve tank. Spark Plugs: NGK CR9EIA-9 (Iridium). Chain Slack: 25–35 mm (1.0–1.4 inches). Tire Pressure: 36 psi (front) / 42 psi (rear). Service Manual Contents & Chapters Kawasaki Z900rs Service Manual
: Genuine printed manuals can be purchased directly from the Kawasaki Owner Center or authorized dealers (MSRP ~$185). The Z900RS is built primarily with aluminum
Covers Wheels/Tires, Brakes, Suspension, Steering, Frame, and complete Wiring Diagrams. Helicoils are expensive
The service manual provides a torque value for every single nut and bolt on the bike. Whether you are installing rear-set pegs, a fender eliminator, or just swapping the sprockets, you torque it to factory spec. No more, no less.
You can guess how to change spark plugs. You should not guess at these three procedures without the manual.