Not all that fast, and lost power as it heated up.
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CBX overheated the 2 middle cylinders and couldn’t turn because of the engine width... The Suzuki GS1000E was far better.
The GS1000 Suzukis were great at the time. I sold my Yamaha XS1100 to get a GS1100SE (one with the small fairing). A really great machine but not as fast as I thought it would be. The fact that they ruled drag racing for years says a lot about the strength of the GS engines.