They do not make my Italion motor I use any more. Some used complete motor bikes can be found for their motor. The motor you posted is a Chinese clone. Going to these particular engines is a bit expensive. You get a way better performing engine. They are motor cross noisy. Keeps me and traffic clear of each other.
Yet I suggest a American made aftermarket clutch even for that Clone. ''Tomar'' https://www.google.com/search?q=Toma...+clutch+ktm+50
They are about 400 dollers for the clutch . Style clutch works like a dream come true tho!