Hi there,
TZR, TZRR and TZM are Yamaha 2-stroker sportsbikes. I think TZR and
TZRR are no longer in production. They are 125cc bikes. Think TZR
was made in Malaysia and TZRR from Italy? (Similar to the Honda
NSR125 and NSR150SP).
TZM is a 150cc bike and is made in Malaysia.
Among the 3, TZM looks the best IMO.
KRR is actually made by Kawasaki, a 150cc sportsbike.
Hope this helps.