Apparently the GB350 sells a lot in Asia ,
If a Yamaha SR500 with a BIG fuel tank , Tubeless Tires , and Belt Drive got too the the market place would it sell ?
Air/oil cooled vs Liquid cooled . I might be "Old School" ?

The GB350 Single makes it's best HP at 5500 RPM , That says it all !!

The RE 350-J Engine makes it's best at 6100 RPM for comparison.
Ridding local , I don't need more power , but I know : In the mountains of the NC. those long up-hill runs suck-up a lot of power !
I have a buddy who used to tease me about having "Half a Harley" with the Savage !

I'd reply with "with half the weight , it's OK"

.................
Remember the days when a 1200cc/74ci Harley made under 50HP and heat wasn't a problem ? It seems those old bike rode around just fine !