i had the k2 and the k7 and they were both nice bikes plenty of power in the 70s and reliable i got 80,000 klm from the k2 and it didnt miss a beat.The k7 i didnt keep for personal reasons but it never gave me trouble either.
The only gripe i had with it was the handling, it was top heavy so when you went to a corner to hard it felt like it was tipping over which can be scary sometimes. It also was an easy bike to scrape.