I'm also confused about what part you are talking about. Honda didn't make it easy on the FT, as there are 3 relay/solenoids. The part that is traditionally referred to as a "solenoid" is labeled "starter relay switch" in the manual, and the starter solenoid is the part that locks in the starter gear. The solenoid relay switches the solenoid. Confused yet? Both the starter relay switch and the solenoid relay would be easy to find substitute parts for, but the "starter solenoid" might be a challenge.
A picture would help...