My 90 engine is finally finished.
Last week I recieved the titanium valve spring retainers for my 90 motor so it was time to mount them and finish the cylinderhead.
Back when I compared SS50 valvesprings with S90 springs, I must have made a mistake somewhere, as the inner diameter of the outer springs differs.
This meant that the springs had to be "helped" a little bit to fit the retainers, but that all worked out.
Fitted together with PM/rocky valve spring set to cope with the high lift camshaft of unknown origin. As original springs would bottom out at this high lift and wouldn't give enough pressure for a high revving engine with this cam.
Further modifications of my engine include:
Lightened valves and rockers.
High lift camshaft.
Ported head with matching intake manifold.
Kei-hin CR29 carb. (the real old model)
53mm piston kit in alloy cylinder.
No rotor on cranckshaft anymore.
Close ratio 4th gear
all combined to form this picture: