I assume these are restricted for learners. Can they be given a bit more oomph easily?
Everything I read (after posting this without thinking) is that the only way to make it faster is to put in a bigger engine - and that is not the point. Never mind eh?google search for vincentcrabtree xr200 throws up a downloadable pdf file that is on this site but cannot get it from the address. Also have some assorted files downloaded some years ago from ???
PM me with an email address & I will send you the files.
Years ago I put a 185 crank head barrel piston into a monoshock 6 speed 125 cases sold it to a guy that did LDT he used it for many years.
Met a guy at a local VMCC meet who had done a similar thing more recently.
I think there are some 200 options now as 185's are a bit collectable (expensive!)
If it must remain 125 I have a copy of a US (I think) magazine article on a racing 125.