I was wondering if its worth it, to have the flywheel lightened ?

Can you feel a better acceleration at all ?

Are there any other benefits ?

I like when an engine goes down in rpm very fast but does the flywheel make a noticeable difference here ?
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Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom

There's not much you can lighten a stock flywheel by, and the gain is very little to be honest. However, every little gain soon ads up, but don't expect to feel anything.

The advantage with taking even a few grams off a flywheel though is magnified a great deal at the crank. Someone much cleverer than me would have a formula for it all, but having that lump hanging off the end of the crank doesn't do the bearing any favours.
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Andy.
NSR-WORLD.COM

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if you're considering the effects of flywheel lightening at the level Andy is talking about, the rotational inertia is reduced a bit, but that also impacts on crank bearing life as that inertia also reduces the sudden change in speed at the ends of each stroke. The change in speed in worn bearings can cause skidding of the roller elements and that in turn accelerates bearing wear.

Would you notice or know this? Probably not. I also think there is a low chance of this occurring as you are not trimming not much mass but the bearing boffins don't like this when I talk to them.

The difference is 1-2hp extra from the top end with a bit of overev but you lose a fraction in midrange . I think I could hear the revs drop quicker or else I was bluffing myself .

Lighten the flywheel with caution. In the interests of not being hit by an exploding flywheel, make sure you leave a nice radius if every corner. A sharp inside corner WILL crack.

You can cut a fair bit away, but as the material gets thinner, the likelihood of cracks and fatigue increases.

It does give a top end gain, but to be honest, if it's a street bike then stick with the standard part for security.