Hello everyone. Can anyone speak to the performance difference between light and super light?

I'm looking at my wish list of upgrades and the flywheel mod @Armen and crew have created is one I'd like to tackle soon. Is there any testimony as to the observable difference between the light and super light flywheels? I see a few folks posted in the marketplace that the light upgrade was tested and works well from the stock. Is the difference to the super light from the light pretty noticeable, or is it negligible and mostly to serve weight reduction?

LOL, well that's a no brainer then!


Thanks @Armen. I wasn't sure if it was done for the extreme weight reduction riders or if there was a noticeable difference between the light and super light. I saw Dave's comment on the light "prototype" in the marketplace post. But didn't see any mention of the super light.

So DBM and Dave tried both of them and found the super light to have even better throttle response and get all the chicks?

@DragBikeMike that is exactly the information I was looking for!  Specifically this part, "Is it worth it if you are already running a lightened flywheel?  I don't know.  But if you have a stock wheel, I wouldn't hold back.  Take it all the way down to 3.000"."

I did try searching on "flywheel" before I posted. I must have not done it correctly.

Tyvm for the link.

So, there you have it-positive reviews form everyone who has done it, and incoherent babble from someone who hasn't.

When I installed the prototype “medium” sized flywheel - my seat of the pants dyno didn’t notice any change either. The good news is that my 0-60 time dropped from 5.5 seconds to 5.0.

The fact that you can’t feel a difference is likely a good thing, as the engine hasn’t developed any bad quirks after the swap.

Armen wrote on 06/10/20 at 13:20:27:


I cant figure out wish to answer but I think I got that was me?

In anycase.. im a formar race mecanics.. amatheur but anyway.. and to that kind of mecanical enginer.. lowest grade!

In anycase, my brother that was the driver/ownwer.. what ever, bout a lighter flyweel to his car,, everone other seems to have done this!

The performace of his car didnt get that much beter.. mayby he wasnt that good driver?

In anycase, as a near to mecanical enginer, I study whats and reding a lot.. its almoste about get a swifter gear shift.. not about the overall performance of the car!

Lower inertia in the engin make it to drop revs faster.. to get in another gear! Thats very importante on a racing track!

Are you going to put this bike on a racing track?

Im kind of experianced on that to, but cars,, cut alla weigt down, cut anything that nots importante down,, make the driver lose at least 10 pound!

Its about the inertia of the car/bike, thats much importante both for the overall performance, braking and curb handeling!

IE.. its big thumper, it need some engine inertia, and balance axcells, to go smothly on normal riding.

One can get a lot of more performance on this bike if the driver lose 10 pounds!

IE I altso could need to lose 10 pounds, but merely becuse of old age and healt reasons!

Its a big thumper.. low weight bike, low HP.. high torque engin, it sutes my fine.

To the defend of this bike and the engin, its a cruiser bike.

Soo I have kind of problem to put in fift gear. almoste doing a double stroke.

And I have answered that to in another tread,, higer speed, leaning more backward on my whole body, my leaft foot folows,. it get a bit uncomfortably.. only a bit!

I thoght that you alredy boght you a LS 650 or a S40?
In any case I bought my a LS 650 for about 2000 dollars!
And the flyweel thing.. im alredy put out my stanse about this bike,it needs the flyweel if  one like to drive it as a normal bike.

And to that, there is a lot of  treads anyhow to make this bike to  anything tha§t it was not though to be!

Soo im still pretend  to  go in a defend of this bike,, its a big thumper, its kind of  cruiser bike!!

If one dont love that, buy any other bike!

And to that.. if one get stuck on this bike, there are several mods to do, if one want to, but sinceerly.. culdnt one buye another bike on the first case!

Soo telling the trought, its a cheap bike to owne/to buy!
Its a big thumper.. kind of a half Hareley.. its a beginners´cruiser!

I dont need a Harley anyhow.. i dont hate them, some of my friends own one, its the same coste as my house!
Other friends drive Dukati Diavlo, another bought him a new Triumph  Truxton.. dont care!

Before Armen started machining flywheels, the issue was sometimes discussed on the forum.  I was on the side of "caution", as I believed the big thumper needed a lot of rotating mass - why would Suzuki put in a big flywheel if it wasn't needed?

Now I am pretty well convinced that the flywheel really isn't necessary for everyone.  If you are a new rider just learning to get a bike moving from a stop without stalling the engine I believe the extra mass may help you avoid stalling the bike.  If you are someone who rides over rough roads in first gear at low engine rpm.......I suspect you will get some benefit from the flywheel.  If you live in an area with sub-zero temperatures the flywheel mass may even help you to get the bike started (when the battery is a bit weak, the oil is thick as molasses and the fuel doesn't like to vaporize).

For those of us who have been riding for years and obtained the ability to use a clutch, ride in warm weather and ride smooth pavement - the stock flywheel really isn't necessary.  With the stock flywheel removed there is still a large amount of rotating mass to keep the engine operating smoothly.  The crankshaft is heavy, the magnetic rotor on the left side of the crankshaft is heavy, the counter balancer is heavy and rotates at twice the engine speed.......there is plenty of rotating mass!  I suspect Suzuki installed this flywheel to make the bike easier to ride and more "cruisier".........most cruiser motorcycles lack the ability accelerate at a blinding pace.  The Suzuki DR650 engine has better performance and does not include this extra flywheel.

Everyone who has installed the lighter flywheel has not detected any negative affects from the change.  The engine still runs smooth, the engine does not start any harder, the steadiness of the cruise is not affected - the only change has been the ability of the engine to gain rpm a bit faster.  While the overall change in acceleration is not drastic, it is a useful tool for those who want a bit better acceleration.