RE: Moki vs Mark
Terry
The 'Mark' badge was/is used to by one US importer or other; probably to allow selling more engines. It will run on 0-5% nitro fuel only.
The Mark is identical to Moki; like the Como is identical to Super Tigre and like Magnum are identical to ASP. The engines are made by the same factory, on the same production line.
The lower compression Dave Patrick engines were badged 'Moki'.