Downloaded the parts manual with thanks, joined the YTOG, but no service manual for the YM180D, what I really need is the manual stick shift transmission service info, it seems the 180d has buried shift forks, so looks like ill have to split the reactor that seems quite involved, this would have been easy if the trany access plate accessed tops of shift forks or equivalent model design, this seems to be unique at the moment but grey or JD 650/750 might be the same but haven't verified yet.
Found some close to YM180D service manuals on YTOG YM195 and 650/750 but have not had a chance to check to see if there equivalent, anyone knows model equivalents better?