Walking through the paddock at a roadrace last weekend, I noticed a squad of CB160/175s
stripped down for racing. One had an oil cooler
plumbed into the righthand engine cover, homemade, really cool(pun). Owner said the stock oil pump had the power to send the oil into and out of the cooler.
Anyone here tried that?
Cheers!  
ps: not as clean as this one, but same idea. Lines came out of front of cover to/from cooler.
https://www.ebay.com/itm/173153236743
cooler was flat type.

This has been discussed previously - and the conclusion was that for most folks the cooler just isn't required.....or even beneficial.  The Savage engine is capable of keeping cool in any weather the rider can tolerate.

The racing world where engines are run at full and highly modified - is very different from the world where a Savage is ridden.  Most Savage are ridden well within their ability to stay cool.

The one exception is DragBikeMike.  He has modified his oil system substantially, and he has overdrive gears on his pump, an oil cooler, and additional plumbing that directs an oil supply to the higher gears in his transmission.  His engine was making so much power that it over stressed the transmission and the gears were failing.