All except for the K&B .61 engine that weighs 17 oz.
and honks pretty good. They are great in any .40-46
size plane, especially with an O.S., or a Magnum
carb. Been runnin' 'em for over 30 years, and got a
new one ( hoarded ) going in an Aresti.
This one is in a .40 size Ultra Stick ( love 'em ).
Magnum .46 carb....there is no better running "sport
engine" set-up than this .( trust me ).
Dave.