Transmission · Gearbox
Ref. OP800
This OPUS 6-speed racing gearbox is designed for Derbi Euro 2 and Euro 3-4 engines (D50B0, EBE, EBS). Machined from a special heat-treated steel, it has a polished tribofinish that reduces internal friction, smooths gear changes and extends the life of the precisely CNC-cut gears.
The kit includes a complete primary shaft, a complete secondary shaft and twelve cut and polished gears, with optimised tooth alignment and micron-controlled tolerances. It is compatible with the original or reinforced clutch; the use of 75W90 gear oil (or racing equivalent) and C4 bearings is recommended.
Designed for 50 to 80 cc track builds, supermoto or shifter karting, this gearbox is intended for engines running above 16,500 rpm, for riders seeking performance and reliability.