G'day RD.
The ci sleeve was cast in originally. To replace it needs to be bored out and new sleeve shrunk in.
https://www.bsaunitsingles.com/item.wws?cpubcode=BSA&sku=CL-B4
I doubt if a simple bore job will remove that gouge. A 2nd hand barrel may be cheaper. https://tinyurl.com/5azfsjfw
Cheers
Thanks Musky, my barrel is the later square type but well spotted. The gouge looks worse in the pic than it is, a rebore will either remove it completely or at least reduce it to being “negligible” (but I could be wrong). PESltd in the UK offer a new liner service should that become necessary, and could do that for $$$
during my planned visit to UK in April, if I take the barrel with me (they also offer a 475cc conversion
).
I will take some pics of the barrel, the head gasket arrangement is a bit unusual and affects the “plate” method of supporting it during a rebore.
