Morning, Mick.

I think I almost certainly used a spring from an earlier Meteor in my Hawk many moons ago, and don't have the specifications, but it did suit the Hawk.

I don't currently have a Hawk, but I understand how sleeving an over-sized transfer port can improve efficiency. I tried it on the 335, but that was before I discovered the bulge in the cylinder wall, which was effectively reducing the compression stroke to a fraction of what it should be, so the sleeving was to no avail. I really must get around to trying to cure that.

Cheers,

Jim