I have the Service Manual for the 169. The 186/169 both use a 0.9L 3Cyl. How did they get the 2Hp. Eng. Piston Cyl. size is my guess but everything else looks the same. Your welcome to it but it's "Huge" and to big of a file for TBN. to download it. You can PM. me or "Personal message" on here an E-mail address and I can send it to you that way.