From Rotary Recycle site---
Part of the Suzuki press release of 1974
Bold added
Question:  Anyone have an idea what the CEM coating is?
On another site 80,000 miles + was quoted for longevity.
Jim Brewer

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FOR RELEASE AFTER SEPTEMBER 15, 1974
The Suzuki RE-5 rotary-engined touring motorcycle is the ultimate
achievement in motorcycle design, engineering and workmanship. The RE-5
is powered by a unique liquid-cooled NSU-Wankle type 497cc Suzuki rotary
engine specially designed and improved for motorcycle application by
Suzuki Motor Company Ltd.

In the short period of just three years Suzuki engineers were able to
design and apply the basic efficiencies of the NSU-Wankle engine to a
sophisticated yet simple 62-horsepower motorcycle powerplant.

The rotary engine's fundamental operating smoothness is a natural asset
for a touring motorcycle. Suzuki's new Mikuni 18-32 HHD two-stage
carburetor and unique port valve system prevent exhaust gasses from
mixing with the incoming fuel charge, for cleaner and more complete
combustion. And Suzuki's use of CEM, a special new hardness coating,
protects the rotor housing from wear for long engine life.

The Suzuki RE-5's self adjusting three element apex seals seek and hold
the exact tolerances along the inner rotor housing for efficient engine
operation. Suzuki's smooth and powerful rotary engine is mounted solidly
on a double downtube frame. No rubber bushings are required for the
RE-5 to deliver virtually vibration free performance

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