I’ve had a few questions recently around whether Yamaha BP-1 pedals can be used with an SK50-D keyboard.
From the surface, BP-1 and BP-2 pedals look identical. For the most part, they probably are.
However, there is a wiring difference between the two which makes the BP-1 pedals incompatible with the Yamaha SK50D.
Hunt down the user manuals for Yamaha YC45D organ and Yamaha SK50D keyboard.
If you look at a Yamaha YC organ series (25D, 45D for example), look for the pin outs for the BP-1 pedals on the back of the keyboard. Then look at the pin outs for the SK50D BP-2 pedal pin out.
They do not match in configuration or pin count. These connectors aren’t exact common place anymore, so trying to locate a replacement connector to convert the BP-1 pedals would be a hunt in its own right.
Because the pin outs are different, you’d have to reverse engineer the BP-1 and BP-2 pedal wiring to understand how a BP-1 pedal would have to be re-wired to work in a BP-2 configuration, if even possible.
So after the above blurb, are the BP-1 and BP-2 pedals interchangeable between keyboards? No. Please refer to the user manuals to see which pedals are recommended for the keyboard you have.