Jack Night bottom end

[Ruairidh Dunford]

My experience of lightening flywheels to that extent is that that they break up causing major problems - I rarely lighten them these days but, if I do, I simply take a little off the outside edge.

I have some pictures somewhere of a lightened cover plate that was about to fail when the flywheel beat it - I don't lighten them any more either, but I am not a 'speed' man.