JF-17 engine are all overhaul by Pakistan and China themselves. They are specially tailor for JF-17. More than 90% of the parts are able to fabricate without Russia involved. Therefore the engine service availability are much higher compare to RMAF. The Malaysian totally depend on Russian is a mistake. China imported the AL-31 FN engine in the past from Russia but overhaul are 100% conduct by AVIC without Russian assist.The main issue with the JF17 is the Russian engine as the Malaysians have had cronic problems with the Russian engines fitted in the MiG29s which are now completely grounded. Hate to say this but the Tejas may stand a better chance with its American built engine. My bet is on the Korean jet to win this tender.