the 44 and 50 may look similar but they aren't. the 44 is a bored and maybe stroked version of an older 39cc model while the 50 is a totally new design. echo has now added a bit more displacement to the original 50 too. and i'm not 100% sure but the above mentioned 39cc might also be a bored/stroked version of a 36cc...to lazy to look the info up though

the 44 also has a 12mm crank while the 50 is 15mm



dave