[Visk636]

I was wondering if it is possible to get a lighter flywheel for the 2013+ 636's. A friend of mine suggested I add it to the long list of things I am already doing to my 636. He was not sure if it is possible with our engine and neither am I (he is a Ducati guy). Just curious if anyone else thinks its even worth doing and/or has done it? How light is too light? Where they bought it from and the difficulty level of installation.

 

[Cb750r]

Pretty much the only way to do this is a lighter stator, I know the old (05-06) had the race kit stator available. maybe Get a race shop to lighten and balance your crank, but I doubt these newer 600s have a lot of fat to carve off. APE doesnt even list the ZX6R in its catalog of engine parts.

 

[Visk636]

Thanks I was hoping someone would tell me its not doable or worth it lol I have spent a fair bit of coin already and I know myself if its an option I would probably do it and my wife and wallet would be upset with me lol

 

[riverszzr]

No such thing as a lighter stator, not really anyways........ and that is simply static weight not rotating mass.......... but you could get one that has less winds and thus less electrical output, less parasitic losses etc........

The flywheels are generally easily lightened by a competent machine shop.....

benefits are quicker reving and less engine braking......... will you really notice....

when it is a stand alone item, the majority of people notice something....... but not everyone

 

[Visk636]

No such thing as a lighter stator, not really anyways........ and that is simply static weight not rotating mass.......... but you could get one that has less winds and thus less electrical output, less parasitic losses etc........

The flywheels are generally easily lightened by a competent machine shop.....

benefits are quicker reving and less engine braking......... will you really notice....

when it is a stand alone item, the majority of people notice something....... but not everyone

Thanks for the reply. I have decided against it...doesn't seem like its really worth the trouble for what I use the bike for

 

[Cb750r]

Incase you have some cash burning a hole in your pocket: https://bdkraceeng.co.uk/tc/products.php?244&sid=jsqffdcqf0mjb8682ppa7l4l97

 

[Visk636]

Incase you have some cash burning a hole in your pocket: https://bdkraceeng.co.uk/tc/products.php?244&sid=jsqffdcqf0mjb8682ppa7l4l97

Lol thanks.

 

[mmattockx]

benefits are quicker reving and less engine braking......... will you really notice....

Should be more engine braking, not less.

Incase you have some cash burning a hole in your pocket: https://bdkraceeng.co.uk/tc/products.php?244&sid=jsqffdcqf0mjb8682ppa7l4l97

I stopped reading when they claimed a 3hp gain on a standard engine. Less crank weight makes no difference to the output at all. Sure, it will spin up faster but that is not at all the same as making more power. And no one can seriously believe they reduce the electrical load by 3hp. That is 2235W, which equates to a 186A current draw at 12V.


Mark

 

[riverszzr]

Should be more engine braking, not less.




I stopped reading when they claimed a 3hp gain on a standard engine. Less crank weight makes no difference to the output at all. Sure, it will spin up faster but that is not at all the same as making more power. And no one can seriously believe they reduce the electrical load by 3hp. That is 2235W, which equates to a 186A current draw at 12V.


Mark

Less flywheel mass, or less mass in the crank/rods/pistons etc is always going to be less engine braking! always!!!

and that race generator set up............ it has less electrical output than stock and a lighter flywheel etc so it will indeed show more hp at the wheel due to less parasitic losses from the stator/flywheel losses...........
I have installed numerous of the 03/04 race stator/flywheel and the 05/06 units and ran them on the dyno......... it is nearly always about 1.8-2.6hp for the range with only that change! most being closer to the top end than the bottom end

There have been tons of other bikes that I have set up as total loss that have been in the 5hp-6hp arena, so yes......... it may surprise you but the parasitic losses of the stator/flywheel is actually substantial.....

I run a race stator assembly on my own street bike, I can't run high beams continuously for hours without discharging the battery, same goes for my heated grips- very limited run times which is fine since I turn them on and off routinely every 10-15 minutes because they get too hot and my hands start to sweat............... but it provides just enough electrical output to keep the battery fully charged even with all street lights installed and working for normal riding I do
I would not have gone that route sans..... I had it laying around and I needed a new stator after a crash (which broke the stator cover and stator) about 10 years ago.......... it has worked fine for 10 years.....

 

[mmattockx]

Less flywheel mass, or less mass in the crank/rods/pistons etc is always going to be less engine braking! always!!!

Bullshit. Newton says different. A lighter crank accelerates and decelerates faster than a heavier one, which translates into stronger acceleration on the gas and stronger engine braking off the gas. It is why a heavier flywheel smooths everything an engine does, both on and off the gas. Flywheel weights are used regularly on offroad bikes to tame the power delivery and they also reduce engine braking to a very noticeable degree.

I have installed numerous of the 03/04 race stator/flywheel and the 05/06 units and ran them on the dyno......... it is nearly always about 1.8-2.6hp for the range with only that change! most being closer to the top end than the bottom end

Only on an inertial dyno. Use an eddy current or water brake dyno that measures steady state power and there will be no difference due to the lower weight. If the race stator makes less power then you should see a bit of a gain there.

There have been tons of other bikes that I have set up as total loss that have been in the 5hp-6hp arena, so yes......... it may surprise you but the parasitic losses of the stator/flywheel is actually substantial.....

On an inertial dyno or steady state? There can't be that much drag from the electrical generation, the stator would melt if it was that inefficient.


Mark

 

[riverszzr]

Bullshit. Newton says different. A lighter crank accelerates and decelerates faster than a heavier one, which translates into stronger acceleration on the gas and stronger engine braking off the gas. It is why a heavier flywheel smooths everything an engine does, both on and off the gas. Flywheel weights are used regularly on offroad bikes to tame the power delivery and they also reduce engine braking to a very noticeable degree.




Only on an inertial dyno. Use an eddy current or water brake dyno that measures steady state power and there will be no difference due to the lower weight. If the race stator makes less power then you should see a bit of a gain there.




On an inertial dyno or steady state? There can't be that much drag from the electrical generation, the stator would melt if it was that inefficient.


Mark

You are wrong on all counts............ but hey go ahead and keep your head buried in the sand and believe what you don't know and what you haven't personally tested........... it is your right to be stupid and uneducated

 

[mmattockx]

You are wrong on all counts............

I did some more reading and apparently I am wrong on this. And I'm man enough to admit it.


Mark

 

[Sher]

Greatings!
From where can I get a race stator for a 09 bike?
Thanks!

Less flywheel mass, or less mass in the crank/rods/pistons etc is always going to be less engine braking! always!!!

and that race generator set up............ it has less electrical output than stock and a lighter flywheel etc so it will indeed show more hp at the wheel due to less parasitic losses from the stator/flywheel losses...........
I have installed numerous of the 03/04 race stator/flywheel and the 05/06 units and ran them on the dyno......... it is nearly always about 1.8-2.6hp for the range with only that change! most being closer to the top end than the bottom end

There have been tons of other bikes that I have set up as total loss that have been in the 5hp-6hp arena, so yes......... it may surprise you but the parasitic losses of the stator/flywheel is actually substantial.....

I run a race stator assembly on my own street bike, I can't run high beams continuously for hours without discharging the battery, same goes for my heated grips- very limited run times which is fine since I turn them on and off routinely every 10-15 minutes because they get too hot and my hands start to sweat............... but it provides just enough electrical output to keep the battery fully charged even with all street lights installed and working for normal riding I do
I would not have gone that route sans..... I had it laying around and I needed a new stator after a crash (which broke the stator cover and stator) about 10 years ago.......... it has worked fine for 10 years.....

 

[Scumbag]

I did some more reading and apparently I am wrong on this. And I'm man enough to admit it.


Mark

I can understand how you got this backwards coming from an off-road background. We always add weight to tame engines. As I was reading through the thread I was agreeing with you. Then I read rivers post and was thinking “how can he get that backwards”. Then I actually thought it through and was like. Ahh. Yea that is correct. It’s why heavier flywheels tame off-road bikes lol.

 

[riverszzr]

Greatings!
From where can I get a race stator for a 09 bike?
Thanks!

You would literally have to call any and all race shops who were racing that era of bike and see if they have one.Ma Kaw used to sell them, but will not have any around anylonger i am positive of that

 

[Sher]

Thank you very much!
Other option is to take the rotor to a lathe shop and machine half on the outside metal on it.
Also I have seen that the rotor is the same for all 09-23 years and the stator is the same for 09-12 and 21-23 years. Basically most of the parts on 09-12 fill wit 21-23 bikes....
All the best!

 

[Sher]

For the moment I managed to machine the rotor on the outside and the weight loss was 225 grams. Another 50grams will be saved by changing the washer and the bolt. I think it's decent

 

[Scumbag]

Well 19-23 is same bike so would fit that also