Apico Performance+ clutch kits offer the complete solution as with our Factory Racing kits, with the added benefit of having aramid fibre papers on the friction plates. This enables them to work at higher temperatures and makes them more durable than standard giving an overall better performance. These products are specifically developed for motocross and enduro bikes. PERFORMANCE + CLUTCH SPRINGS - (X6 SPRINGS) HONDA CRF450R 13-20 CRF450X 19-25 CRF450L 19-25 CRF450RX 17-20