Thierry,
I agree with you fully. I had have no leaking engine ( with 150T km on it) with original set up. I only put new k7200 Turbo instead original and Brian raryl8 muffler and problems start after 50 km on it!
Oil start leaks between head and cylinders so it finally finished with engine rebuilds with re surface heads & cylinders top. I didn't add flame rings as I don't like increase power and torque more. New dilavar head studs is on place too. My opinion is that every increasing of P&T should be make with respect as above.
My personal experience and my money...
