Fins in Liquid Cooled Engines

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Bajaj Avenger is liquid cooled and contain fins.  the fins again may decrease its heat transfer rate and all
Avenger has fins and it is both air and liquid cooled
According to fins theory ,  i actually couldnt understand what will happen if fins are present in liquid cooled engines...and why avenger is having fins while rest of liquid cooled  bikes doesnt have...
any body knws ...comment it


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