Had my 6.2 lb flywheel machined removing 2 lbs by Armen. The more I ride it the more I'm liking it. My bike already somewhat on the twitchy side now even more twitchy. When I first installed it , I could barely notice the difference. By the way R & R of flywheel is easy. It revs quicker seems right where you need it to. Not huge noticeable difference but I like it. On a out of the hole run I feel it rev quicker , until powerband mellows then normal feeling and at a freeway speed snap she takes off for passing. Keep in mind my engine has several mods. Im not sure but  it might be more noticeable on a stock engine . After many rides I like it ! When my bike comes apart for paint and seat then I will install my even lighter flywheel at 3.75 . I'm sure I will like it too ! I love R & D and tuning , there is not much more H/P
left to find in my engine unless I use a bigger cam. But If I find more H/P with my tuning & lighter flywheels you can bet I will be posting it !

Thank You Armen !

Great question, It's seems the same but I wasn't testing for that , a lighter flywheel you might be losing some compression braking I would think. Maybe Armen has that answer. I am shooting for the quickest out of the hole starts with tuning and lighter flywheels. It just started raining again here otherwise I would go try it !

Hey Ruttly,
Glad you are happy with the mod!
I shaved about 2 lbs off the flywheel, because that is how much I take off the Ducati flywheels, and that seems to give a noticeable improvement with no down side. There are some super light aluminum flywheels out there for the Ducs that make the bikes too twitchy for many folks.
I knocked a bit more weight off the second flywheel I did for you. Interesting to see how it feels.
It should provide a bit more/quicker engine braking as there isn't as much inertia carrying the crank revs.
I know Dave has put together a tool kit for doing the swap.
Not rocket surgery, but it takes some time, skill, and tools.
-Armen

Ruttly asked:
"Would a heavier stock bike benefit more from a lighter flywheel than a modified 310 lb bike like mine ? Would it be more noticeable ?"

It really depends on how sensitive the rider is. On the Ducs that have used my lighter flywheels, the folks who are hyper sensitive will not only notice the difference in how quickly the motor revs up, but they may even notice that the bike is easier to change direction.

Huh?

A story:
Years ago when the brilliant John Britten built his all conquering twin, one of his racer/test riders was Andrew Stroud. One day, while testing at the track, Stroud came in and said to Britten "Lighten the crank so it'll turn quicker."
"Huh?" says Britten.
Stroud replied, "I went through the same set of 'S' turns in 4th, then 5th, then 6th gears. At the same speed. The bike turned easier in the higher gear."
Explanation:
With the crank rotating in the same direction as the wheels, the heavy crank had a lot of gyroscopic effect, and was hard to change direction. Lower gear meant the crank was spinning faster, so more gyroscopic effect. A lighter crank would mean less gyro effect at higher RPMs, so easier to change direction.

I'm in awe of guys like that.

Contrast that to the fact that many of the times when a student brings in their bike for my motorcycle maintenance class, the bike has less than 10 PSI of tire pressure. I ask them if they rode the bike to class, and did they notice any odd-say for example that the bike handled like a drunk pig on a water bed?
"No, it's fine" is always the answer.

Long answer to a short question. Depends on how good you are.

JOG , You crack my up , lmfao

That is if it ever stops raining here in CA !!!

Armen , Some clarification please , is a drunken pig an actual intoxified swine or just a fat chick picked up at the local bar ?

I guess both could have a adverse affect on a waterbed !