RE: OS 40 MAX H
The Max H series engines will surprise you. I run a H-80 and it will spin a Rev-Up series (2) 16x4-1/2 like no-bodys business. Run good fuel with castor oil and it will keep running a long time.
The strap-on mufflers work great as well.
correction, was 16x6 went out and looked at it 16 x 4-1/2....