Nikki, I think the only chart that is valid is the cr80 one.
okkx'er, the yz80 and the yz85 are very different motors:
ALL New for 2002!
Engine:
The industry’s mightiest mini gets an all-new lightweight, liquid-cooled two-stroke engine’s capacity increased from 83 to 85cc (bore x stroke = 47.5 x 47.8mm) to deliver even harder-hitting, moto-winning power throughout the RPM range.
Crankcase features reshaped scavenging port for reduced horsepower loss and improved mid-range and top-end output.
Crankcase reed valve induction and 28mm Keihin flat-slide carburetor ensures seamless throttle response across the powerband, while all-new, aluminum carb body helps reduce weight.
New-design digital CD ignition system puts out a more precise spark and monitors engine speed to ensure optimal timing for quicker, stronger response during hard acceleration.
Smooth-shifting, 6-speed transmission features new-design main and drive axles, while all-new, heavy-duty, multi-plate clutch delivers maximum hook-up for outstanding acceleration and corner-exiting power.
All-new, involute spline set-up in clutch means smoother shifting under power with greater durability at competition-level usage.
All-new clutch cover features a sub-cover for easy access during maintenance.
Gearbox features a new-design shift shaft for smoother shifting feel with no spring friction.
All-new, lightweight radiator has larger cores and more louvers, while retooled water pump features a cast aluminum (vs. resin) impeller to ensure maximum cooling efficiency — and minimal horsepower loss.
New, lightweight exhaust system design with a reshaped tapered section helps create a broader powerband with stronger low-end punch.
New airbox design with reshaped filter ensures greater air cleaning performance and easier maintenance.
Primary kickstarting features a reshaped lever with a sealed pivot to keep out water and mud, enhancing durability.