I am looking to replace a Mustang 50 in a Byro-Drive 4-bladed prop drive system with a BT50 and was told that the -SA was nearly identical. However, this model doesn't seem to be sold anymore. What are the differences between the SA and the SB or EI version (other than the obvious electronic ignition on the EI version).

Also, can I order a replacement cylinder in gray, or paint the blue with a high temp paint? The bright blue looks cool in a Pitts or Extra, but no so much in a scaled out warbird.

Thank.

The main difference between the Fuji-Imvac BT-50A and BT-50B is the carburetor. The BT-50B has a carb with a larger bore for more power.

The engine only has the one color choice for the cylinders. You're on your own if you decide to paint it differently.