According to my 2005 H2 Owners and Shop Manuals, the BF2D was (is?) offered in four types:
SA - short shaft, throttle lever
SHA - short shaft, throttle grip on tiller, but w/o centrifugal clutch
SCHA - short shaft, throttle grip, with centrifugal clutch
LCHA - long shaft, throttle grip, with centrifugal clutch
Don't know about prior/subsequent model years ...
Talbot, FWIW, there's a really easy way to tell if the motor does or doesn't have a clutch: with motor off (obviously!) just grab the prop and turn it. If it moves easily, it has a clutch. If you feel resistance (the compression in the cylinder), then it does not.
When I got mine 2 years ago, it would not idle low enough to disengage the clutch. I replaced the carb with a new one from boats.net, and adjusted the throttle linkage so that the motor would both start and idle at the lowest throttle setting. She's purred like a kitten ever since! ;-P