I'd be surprised if that engine was original to the 109. From a 1x8/9 series Owner's Manual:
From a 1x6/7 series Owner's Manual:
And further proof, this is an early "prototype" Owners Manual that had the 1x6/7 series model numbering but had the Wide Frame images.
From a 1x6/7 series Owner's Manual:
And further proof, this is an early "prototype" Owners Manual that had the 1x6/7 series model numbering but had the Wide Frame images.