Hi Marvic, It is an unusual Briggs, most of it looks like the original Briggs 3 HP that I had on my Scott Bonnar except for the petrol tank set-up..(mine was part of the carby set-up) Maybe one of our forum members may be able to shed some light on it... Thanks for posting the pic.
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