I believe all Tigers came with Rotax engines, but not all Rotax engines came in Tigers or even in trikes. I think the KTM80mx, which was the basis for the Tiger 80, was even a Rotax designed engine.
Nicholson 500x (Project)
Nicholson 185s
Nicholson 110 (That takes an atc70 tank)
Ascott 500 head/350x (Project)
Homebuilt Racer Chromoly Suspension 110 (Ragin Runt)
PK Racing Suspension 70
A+ Inc Suspension 70
AWS Aluminum 90 frame
Hi Performance ATC Suspension frame rd350
Hi Performance ATC Suspension frame 90