Light Flywheels Again.

[koko64]

The 580gm alloy flywheel was tested tonight. Pretty much in the Goldilocks zone for me.

[LowercaseJake]

Ooh look here, another option for 98+ carby 900's and 750:

https://www.desmo-racing.com/en/aluminium-racing-fly-wheel-kit-ducati-740gr-xml-245_534-3183.html

And for you Desmoquattro guys this seems like an excellent price for a package deal:

https://www.desmo-racing.com/en/aluminium-racing-fly-wheel-kit-ducati-740gr-xml-245_534-3183.html

The /Desmoduo has a "kit" as well, it's exactly 100 euro cheaper.

[koko64]

Just be wary of alloy spline type flywheels.

[koko64]

After changing flywheels back and forth about 5 or 6 times I sacrificed the thrill of sheer acceleration for smoothness and tractability. With the lighter flywheels I was needing a slipper clutch due to my riding style changing with age. Formerly I was a point and shoot rider with the throttle pinned and front wheel aloft on corner exits, but now I ride a smoother corner speed style running momentum through a series of esses in a higher gear and riding the torque curve rather than the higher rev range. I ended up with a full 1.9kg stock flywheel! As I do not want to run a slipper clutch on the street a heavier flywheel suited this purpose. Plenty of testing gave me an honest outcome suited to a change in riding style that has crept up over the years. So I've turned a full circle. My arthritic hands also appreciated the smoothness of the stock flywheel .

I would use the pie tin 234gm flywheel for the track and the 580gm and 900+gm flywheels for aggressive street riding or track work. The stocker and machined stocker work well for the street. I played around with gearing and also note the interaction between flywheel weight and carburettor type. CV carbs give a bit more margin in the wet and low traction conditions when lighter flywheels are used. Flatslides give extra response to overcome the initial sluggishness of heavier flywheels, while the extra flywheel weight helps traction with flatslides while on the gas while leaned over. I remember needing to wait to pick the bike up before gassing it hard with a light flywheel/flatslides combination. I know people who have high sided with that combination. Every combination was a trade off. The Kamna 580gm flywheel is great and I really liked it, but I need a slipper clutch to use it.

Gearing options are a preference and 15/41 worked well with the heavier flywheels but I could run as low as a 39 rear sprocket with their smoothness and inertia reducing transmission snatch. I would recommend a 15/41  or more with the lighter wheels if you can't tolerate low speed snatchiness and don't want to manually slip the clutch.
Clearly personal preference and riding style will determine your choice of flywheel.  My riding style and needs have changed over time.
The three other flywheels are not wasted with various other projects and customer needs in the pipeline. I may sell the Gixxer in the future and build a short manifold motor for a Supersport track bike for my sixties and the pie tin may just have a home.