Hi WCE ,Paul and Jack
It also looks to me that with the 1960 Turner models ,instead of having an option of recoil or impulse starter on the same
model ,Turner had 4 BIM for the impulse starter model and 4BM for the recoil starter model.
Yes WCE your Turner has the starter drum for the Surestart impulse starter, the 4BIM Turner has a starter drum similar
to a Victa full crank 2 stroke.
Hmm does the I in BIM stand for Impulse ( B series Impuse Motor) (4BM 4 stroke B series Motor) ??(M could stand for Mower)
Cheers
Max.