4 stroke Magnum engines
Well Longaly,
I have 5 of them if that is any indication of anything. As far as I can tell, they run about the same as the OS 4 strokes excepting the OS 70 and some of the pumped, supercharged, & fuel injected versions of the OS's.
I have 2 Magnum/ASP61's one ASP65, one ASP91, and one ASP120. They all run just fine. This is saying that the ASP/Magnum/SC engines are all identical if you are comparing the same years made. I also have an old style ASP40 and an old 108 Red Head 2 cycle engine.
The Magnum61 doesn't always hold it's own with the Saito 56 and the Saito 100 has about the same power as the Magnum120 FS. But I also know that my ASP91 is stronger than my Saito 80.
Jim