Have you tried betamotor.com for the service manual? I have a 2016 250 4t racing and found the service manual on there. It was the first page to come up following a search on google. Although my engine and frame numbers match the v5, my engine appears to have been built a lot earlier. My cylinder is stamped 2004. My clutch cover is stamped 2010. So there is every chance that there have been no changes over the years.