RE: Will it work properly???
Yes it will work great, Heliproz even sells packages with the Futaba gyro. I have some of the 401's on all JR. You will need to take an xacto knife and cut the little raised ridge off of the plugs on the gyro so they will fit into the JR receiver because JR doesn't have the slot for them. Heliproz said you get a better gyro for the money spent with Futaba.