Hi to Grumpy and CyberJack,
I have a feeling that the Imperial may have been fitted with what was called the Victa Power Unit....available in 125cc and 160 cc Series 70 engines....See the brochure that follows....
cheers

Attachments
Victa_2_stroke_Info.pdf (1.25 MB, 57 downloads)

Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member.
Kindest Regards, Darryl grin