rgv mike wrote:Hi Paul, Are the cranks rebuildable?

Yes and no! In common with NF5 and NX5 cranks the NSR cranks were designed as a consumable part so Honda never sold rebuild kits but they are rebuildable to a point. The big end pin is integral to the crank web so it is dependent on this being in usable condition and also the con rods being serviceable, the original main bearings are manufactured by Koyo and several people have managed to source these in the past. The centre main bearing has an integral seal on the MC21 and the outer crank seals are standard NSR parts still available from Honda.

have never had an F3 crank in my hand but I believe they are a cross between the NF5 and Roadbike and have the larger "tin" covered flywheels like the NF5, the NF5 con rods and the double taper for the NF5 flywheel. But as I have never seen one in the flesh please don't take this as gospel.