Common misconceptions here:
Heavier flywheel will not increase torque nor reduce HP.
At any specific RPM the same amount of Torque and HP will be produced, regardless of the weight of the rotating parts.
Acceleration is what is affected by the weight of the parts. Heavier parts change RPMs slower. Lighter ones faster.
So, if you want a plonker, use a heavy flywheel. Better low and steady RPM manners. Want a snappier bike, but maybe buzzier, and twitchy (RPM wise), then use a lighter flywheel.
There are always trade-offs. When we were racing a Bultaco 250 2 stroke in 250 GP AHRMA, the rider insisted on a heavy flywheel, no matter how loud I protested. We were at Daytona, and he chopped the throttle at high rpm. Even with the heavy flywheel, the revs dropped pretty quickly. The tonnage on the end of the crank was too much for the flimsy crank and snapped the end off.
As I was taking it apart, Keving Cameron (tech editor of Cycle Magazine, and as near to God as there is in the bike biz). I held up the flywheel and broken end of crank and started to say "Hey Kevin, what do you think?" when he looked at me like I was six kinds of idiot and said "You have to ask?".
Next round we had a lighter flywheel.
Having said that, I doubt the Savage would have similar issues.
But it would rev up and down faster. Exacerbated by higher compression and more displacement.
-Armen

quicker with the light..