Found this written about it!
Eddie Lawson won the AMA Super Bike Championship in '81, so Kawasaki made this bike to commemorate the victory. It is based on the Z1000J2, but with a KR Kerker 4-1 pipe, rear shocks with separate resorvoirs, an oil cooler (from the GPZ1100), a different head angle (from 27.5 to 29.0 degrees, adding 0.6 inched of trail), 34mm CV Mikunis, rear wheel up from 2.15 to 2.50 inches, and modified brakes and head. Sticker on tank commemorates '82 AMA victory and has Eddie Lawson signature. Unique to the ELR is the tank filler cap, which on some very rare models has a black colored tumbler in addition to the black cap. Black aluminum footrest mounts and a black grab bar for a surprisingly good passenger comfort. A white Kerker sticker was included which dealers or owners typically put on the tank or fork bottoms. The racing version is referred to as the S-1 and has twin-plug heads, an aluminum fuel tank, different brakes, triangulated braced swingarm, and a host of other modifications (no Champion stickers).
