2k-2/2k-3 Questions

F

F_G

New member
A couple of questions for you kukosan experts out there.

1. Is there a difference in flywheel weight between a 2k-2 and 2k-3 ignition?

2. What is the difference?

This seems completely backwards to me, but if what everyone is saying is true with a 2k-2 wires exiting at 10 o'clock and a 2k-3 exiting at 2 o'clock, it appears my '08 300 has a 2k-2 and my son's '09 250 has a 2k-3. Can they be swapped? He's looking for little more snap and less snap would never hurt me, plus I'm looking for a little more lighting capacity. Anyway, what does everyone think?

Thanks
 
Not an expert here, but all my reading here says - Yes they can be swapped. I'm not sure what the weight difference is.

I have the 2k-2 and have wondered what going to the 2k-3 would be like. If one fell into my lap like you, I'd probbaly give it a try.
 
I did the swap on me XC300. Turning it into an EC300.
I noticed very little difference in snap or flywheel mass.
But, if you listen to my GF. I am an insensitive slug.
Incapable of sensing even a major change in attitude. ;)
Jeff
 
The ignitions are interchangeable and will definitely give a different feel to the power of the bike. The heavier (and milder) ignition has wires that come out of the motor at 2 o'clock. In my experience it will soften the hit more than the lighter ignition with a 10 oz. flywheel weight.
I'm a slow "C" rider and I prefer the heavier ignition on my 300 for the tight trails I ride. On the 250 I'm happy with either ignition as long as the lighter one has a flywheel weight added. Faster riders probably prefer the lighter ignition on both the 250 and 300 and add weight to suit riding conditions. - Ken
 
Here is a tech article discussing the effects of flywheel mass (moment of inertia).
http://www.gasgasrider.org/html/flywheel_effect.html

F_G,

Like Ken mentions, you can add a flywheel weight to your existing 2K-2. The nut is removed and a new nut with integrated weight is installed. Your 2K-2 ignition remains as-is (i.e, no flywheel puller is needed).

A 10 to 14oz weight makes a noticeable difference in my opinion. However, my '07 EC250 has the 2K-3 and it "lugs" down very low without stalling compared to my old '01 XC250 with 2K-2 + 10oz weight.
 
Can anyone tell me what the difference in weight is between the 2 ignitions?

I like my 300 just fine, I don't feel the need for more flywheel effect, it's my son that would like a little more snap for his 250. I would like a little more lighting capacity, if a little more flywheel weight is the cost, then so be it, lighter flywheel for him, more electrical juice for me. If I can kill 2 birds with one stone it's a win/win situation.

2k-2 flywheel weight?
2k-3 flywheel weight?

Isn't it a bit odd that GasGas would put a 2k-2 on an EC300 and a 2k-3 on an EC250 Racing?
 
I can't give you specifics but I have had the flywheels off of both my bikes and there is a big differance between the two. Use a Kawasaki KX flywheel puller and swap them out, it's very simple if you have air tools. The stators will have to be swapped also.
My bike responds much like a MX bike, my kids is very smooth without the "jumpiness" as he describes.
If I remember correct there is 35 watts with 2K2 and 60 with the 2K3.
 
There is actually very little difference in weight between the 2 flywheels And I mean VERY little. I have the weights of both but I'm away from home at the moment so I can't get em. The big difference is the mass of the 2K3 is carried further out giving it more flywheel effect. You can add more weight to the 2K2 so it's much heavier than the 2K3 but you still end up with the wimpy lighting output. If you are carefull you can also remove weight from the 2k3 but you need to know what you are doing. I think a 2K2 on a 300 just might be a bit much.
 
Could a person add more flywheel weight to a 2k-3 ? Or maybe not enough room? I'm a four stroke rider and want to change over to the ec250 or ec300. The more flywheel effect would probly help me.
 
Flybars, if you get an EC you would probably really enjoy it if your trying to stay close to 4-stroke feel (if it's a 2K3). There really is quite a differance in the performance (or at least feel) between the two, at least the two my son and I own. My son dislikes mine having grown up on 4-strokes and I like the light flywheel effect of mine even having ridden XR's and trials bikes for most of my past.

Thanks SKIDAD for better explaining the differance between the flywheels. The diameter is also what makes it necessary to also change the stators when making the swap.
 
Sounds like swapping the ignitions out on our 2 bikes will have the desired effect both of us are looking for.
 
SpeedyManiac said:
No you won't. 05+ bikes all have the leads for the hi/low ignition (it's the CDI, not stator stuff) so you're fine.
Click to expand...
Thanks Steve.

What do you think of my idea of switching the ignitions? Derik is looking for a little more snap, think this might help?
 
It will definitely help. I've ridden both ignitions - both of my bikes have the 2k-2 right now and they definitely have lots of snap! They're still plenty tractable, but the 2k-2 revs a lot freer. That said, I'm adding a flywheel weight, and may go for the 2k-3 ignition when I get a 2010 bike. Been riding trials a lot, and want a more tractable motor.
 
The 2K-2 with the 12 - 14oz is perfect on a 250 in mixed woods terrain. I also have a 10oz and use it for sand sometimes. Revs nice and still hard to stall, I can lug it up trials like hills with minimal clutch. I match this with a G2 throttle and you can tune response to whatever you want.

What Ud Luz is refering to about loosing the map select is that the newer bikes use a different connector/harness system between the stator and CDI. Part of the harness is wired to the stator. So, if you use an older stator with a newer bike it will fit and work, but the harness will have to be adapted. No big deal.
 
GMP said:
The 2K-2 with the 12 - 14oz is perfect on a 250 in mixed woods terrain. I also have a 10oz and use it for sand sometimes. Revs nice and still hard to stall, I can lug it up trials like hills with minimal clutch. I match this with a G2 throttle and you can tune response to whatever you want.

What Ud Luz is refering to about loosing the map select is that the newer bikes use a different connector/harness system between the stator and CDI. Part of the harness is wired to the stator. So, if you use an older stator with a newer bike it will fit and work, but the harness will have to be adapted. No big deal.
Click to expand...
But I'm guessing between an '08 and an '09 it would be plug and play?
 
Correct, Frank. Your guy's ignitions will swap over just fine.

By the way, I tried a 10oz flywheel weight this weekend on my 250. Jury is still out. Yes, it helped hook up on the rocks with a S12, but I ran a trials tire during the race, so I think the weight was pointless.
 
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