Originally Posted by
Humminbird_Greg
If you are going to put the standard CSi transducer that comes with the 899ci HD Si unit on the trolling motor, I would exchange it for the XTM-9-Si-180-T which was made for trolling motor mounting and can take a little more punishment before breaking. It also has another layer of RF shielding to help with trilling motor interference in case you have it. You will have to contact the Humminbird Customer Service folks (1-800-633-1468) to set this up. Just don't open any hardware bags or uncoil the transducer before you send them off.
If you bought the transom and trolling motor versions of the HDSi transducer, then yes you can just swap the mounts between the HDSi transducers as they are the same except that one comes with transom mounting hardware and one comes with trolling motor mounted hardware - but you cannot swap mounting hardware with the CSi transducer as the HDSi and CSi transducers use different mounting hardware.