Yanmar Diesel YSE8 hand starting chain and handle

[RNWats]

I've just acquired a 17ft sailboat with an inboard Yanmar YSE8 diesel engine. The unit has a hand turned manual starting shaft, normally connected to the main motor drive with a roller chain. Unfortunately the chain on mine is missing, so I was hoping to at least find out the type of chain, get a part number or be able to locate a replacement one.
Worst case I will have to get the callipers out, measure the roller pitch, and try to find a matching type.
Any advice would be appreciated.

 

[Tranona]

This is the best source for parts and information on old Yanmars yanmar.com/global/dealerlocator/gb/213046/