Hi , tryed serching for the answer to this but im feeling lazy and cant be bothered to trawl through post after post.

What length/stroke steering damper should i use?

Think its 140mm

see thread here:

viewtopic.php?f=22&t=15540&start=0

i think you'll find its either a 130 or 140 (mm)...either is fine as a norm

also check the for sale section Abormoto has a sprint one for sale with bracket

140mm, highly recommended to get the reverse-fitting kit from Rick O...