RE: .20 engine for Warbird Combat?
Eeesh! I'm a little behind the curve. Just checked that web site and K&B doesn't make the .20 size any more. They do have the .18 though. And the Fuji engine? They want $175 for it!! Little much for me! MDS makes an .18, might be worth a shot.
I think I'll go with the MVVS if I have to have a .21 Around $80 without a muffler. And the Magnum for a .25 size. Around $60 with muffler.
That's my .02