My experience with large glow engines and small gassers is confined to a ST2300 and a CRRC pro GF26i. On paper the large tiger has more HP but in my opinion the 26 cc gasser beats it hands down. It delivers the power at lower rpm and moved my 11 pounds Extra with more authority. I think the OS 160 is a better engine than the ST3200, judging from its price, both are rated at 3.7 HP but deliver their peak power at different rpms, the OS having the advantage (9000 vs 1200 if I remember well).