Hi Mark, and a warm welcome to the forum. grin It's great to have you onboard.
Re your question, could you please post a pic of your machine and in particular the engine, as from memory, the 16" Victa Imperial used a Series 70; 125cc, 2 Stroke engine, and I wish to confirm this, by the photo.
If it is, then it requires 2 Stroke oil mixed with the petrol to the correct ratio. Also "Aerostart" is not recommended, as it strips the oil film from the cylinder barrel and can damage the engine, with continued use. wink
Once again Mark, :welcome:
cheers2


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