I go faster with carbon fibre reed valves

“Yes, the engine runs better with carbon fibre reed valves. The key aspect is the stiffness of the material, because, for the same thickness, carbon reed valves are more rigid and, therefore, can be much thinner and lighter to move. Another advantage is better adhesion to their housing, which results in a virtually airtight seal when the piston descends. This gives better engine efficiency. The only problem is that they are more expensive than those made of fibreglass. Warning: the advantage in terms of time is a just a few hundredths...”.