RE: sc.25 engine!!
SC engine are good and easy to handle, strong engine.
SC, ASP and Magnum are same engine and maked in same factory in China. These engines has true ABC while the OS engine are maked in cheap material as ABN who are peeling of and cost more than SC,ASP and Magnum.
The engine likes 10-15 % nitro for best reliable idling.
Jens Eirik