Supreme Tool & Machine Rotax-Style Valves

To keep the valves working in unison, these Rotax-style valves use exhaust pressure to open and close the exhaust ports rather than cables that require adjustments.

Opening RPM can be tuned with an exterior adjuster. A pop-up indicator simulates valve action so tuners can synchronize and adjust the valve opening on a jackstand. The kit includes alteration of stock valves to fit the new valve assembly. Kits for Suzuki 800 and 900cc engines sell for $225 each. Supreme Tool & Machine, 248/673-8408;

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