Contrast spring Derbi Variant Start (pedals) silver TJT

A suitable contrast spring is very important to get the most out of the engine's performance. The harder the spring, the higher the engine speed at which it operates.

Silver-coloured model (hard / competition)

The manufacturer TJT offers two hardness levels:

• Sport (white) for simple setups with little more than a variator and an exhaust
• Racing (silver) for setups with cylinder, carburettor, exhaust, etc.