Crankshaft Derbi Variant Start 3 C.44 90 connecting rod RB Racing

Crankshaft C.44 90 connecting rod RB Racing for Derbi Variant Start 3.

If you are looking to get the most out of your Derbi Variant Start 3 engine, this long-stroke RB Racing Crankshaft is the component that will make the difference in your racing build. We are stepping up to the next level: a high-performance crankshaft manufactured to withstand the stress of the most demanding cylinders on the market.

The first thing that stands out is its 44 stroke configuration combined with a 90 mm machined connecting rod made from a forged block. By extending the connecting rod to 90 mm, we reduce the piston’s angle of inclination, which drastically decreases lateral friction against the cylinder liner. This results in an engine that revs more freely, reduces wear, and pulls with brutal force at high rpm.

With webs measuring 74 mm in diameter, this crankshaft increases pre-compression in the crankcase, achieving excellent gas charging speed. Keep in mind that, due to the 74 mm web diameter, it is necessary to bore or mill the original crankcases of your Derbi Variant Start 3. Its weight of 1335 grams is perfectly calculated to provide the necessary inertia on the track, stabilizing the engine at high rpm and preventing the annoying vibrations that destroy the bearings.

Technical specifications

• Stroke: 44 mm
• Connecting rod length: 90 mm (machined)
• Web diameter: 74 mm
• Total weight: 1335 grams