Rodrigo Alvarez

Tinkering as a way of life

Category: Head works

K75 Restoration: Engine Rebuild & Final drive maintenance

Taking advantage of the christmas holidays I’ve been working hard on the engine. Having the head removed, it makes sense to check the state of other components, such as the piston rings, connecting rods and bore tolerances. I should replace the big-end conrod bearing shells, which are worn but have not reached their service limit,

K75 Restoration: Valve Job

After careful disassembly, the problem has become more obvious (if possible). The valves themselves, have their stems in tolerance (Inlet: 6.960 – 6.975 mm ;Exhaust: 6.945 – 6.960mm), but the problem relies with the mating surface of the seats. I used the optical measuring machine at ICAI to take a few reference points to compare,