I need to do more hunting as the Yinxiang contact I found, Jinhau Kaichen Trading CO, LTD, have replied and want to sell entire engines by a minimum of 50 units and at nearly £1,500 an engine, then add shipping and customs makes it crazy pricing. Not a viable option, but I have not given up yet as there will be suppliers and factories rather than a trading company. I just have to dig deeper. Hopefully the realisation of the size of the market available will nudge one of these factories/suppliers to start selling parts, they will make good money doing so.
A very different experience to the Hangkai manufacturer Taizhou Gongda Motors, who I have dealt with and purchased from, they where very helpful and keen to sell the parts that were very hard to source in the UK for their Hangkai outboards. I cannot rate Taizhou Gongda Motors high enough, a very good company with very high quality products.