As to the 2qm15 starter And Cylinoid I just read an add for a New cylinoid for I think it was 34.oo plus shipping, it states it was used on a long list of manufacturers. I was doing a Yanmar parts search. There is also a company that sells starters & Alternators. I have a catalog somewhere. I have seen new complete yanmar starters but they were like 800.oo.
Parts are out there but I paid 80.oo to get my cylinoid rebuilt. so be carefull with used bilge Iron.