Aluminium Engine Kit ZX10R C1H-C2H Ninja 04-05 All the bolts to replace originals on side engine casings including clutch covers, water pump housing, alternator cover and sprocket covers where applicable. Kits are easy to use - remove one bolt at a time, and replace with an identical length Pro-Bolt! Primarily M6 threads with a 5mm Allen key drive. Our bolts are made from 7075 aluminium which is an incredible 60% lighter than your originals. With 7 colours to choose from your machine really will stand out from the crowd. Also included in the kit are pro-lube, and relevant Allen keys. Instructions provided for torque settings.