125 2 stroke oem vs hd clutch springs

djp48
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djp48
2004 kx 125. V-force reeds, Athena 125cc cylinder and head, pc pipe/ silencer, keihin air stryker 38mm.
The bike runs pretty good.
I installed an ebc clutch plate set with HD springs. All part of a kit.
The clutch pull isn't to bad, but lighter would be better.
Do you all think hd springs are necessary?
What do you prefer?
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murph783
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murph783 11/7/2021 3:14pm
11/7/2021 3:14pm
Were you previously having issues with the stock ones?
djp48
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djp48 11/7/2021 3:37pm
11/7/2021 3:37pm Edited Date/Time 11/7/2021 3:44pm
I bought the bike from a friend who has a few pounds on me and he never mentioned any issue.
The reason I ask is I'm putting together a return order and was debating on sending the new oem springs back that I bought not realizing the clutch plates I bought came with springs.
What's the purpose of hd springs? Can you make enough power that the clutch wont hold with stock springs? Heavier rider?
I'm guessing your going to suggest giving them a try so I'll probably hang on to them.
davidgrip
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davidgrip 11/7/2021 4:52pm
11/7/2021 4:52pm
djp48 wrote:
I bought the bike from a friend who has a few pounds on me and he never mentioned any issue. The reason I ask is I'm...
I bought the bike from a friend who has a few pounds on me and he never mentioned any issue.
The reason I ask is I'm putting together a return order and was debating on sending the new oem springs back that I bought not realizing the clutch plates I bought came with springs.
What's the purpose of hd springs? Can you make enough power that the clutch wont hold with stock springs? Heavier rider?
I'm guessing your going to suggest giving them a try so I'll probably hang on to them.
04 KX125. Pro Circuit Springs, 16 KX450F OEM Perch and lever. HD springs are used for clutch longevity. I pull with my index finger only, and have no issues with the stiffer pull. The best tip is no/less clutch. Amazing bike. I am also running a 52 rear, and 116 link Sunstar sprocket and chain. This setup will reduce your need for the clutch.



djp48
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djp48 11/8/2021 5:43am
11/8/2021 5:43am Edited Date/Time 11/8/2021 5:48am
Looks like that 450 perch and lever give some extra leverage.
I have asv shorty levers, new cable, everything's lubed and use my middle and or index fingers. The pull isn't bad just in a self debate about whether the hd springs are necessary.
I understand the clutch longevity if the stock springs wouldn't hold. I'm going to be back in there for clutch hub and pressure plate replacement. I might throw the stock springs in and see what it does.
I'm also running a 52 rear although I never thought of the extra links in the chain. I'll have to think about that as I get more seat time.

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sandman768
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sandman768 11/8/2021 12:51pm
11/8/2021 12:51pm
You can alternate the stock & aftermarket springs to lighten the pull but still get benefits of slightly better clamping pressure.
Polishhammer 11/8/2021 1:17pm
11/8/2021 1:17pm
The HD springs won’t hurt anything. I would use them as riding 125s usually requires a lot of clutch work when riding them
Falcon
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Falcon 11/8/2021 1:46pm
11/8/2021 1:46pm
I think heavier clutch springs are unwarranted on a 125. You should get full hookup with the stock ones even with some modifications to the engine. If you feel like you are getting clutch slip in high-power situations like going uphill through mud, or full power at the base of a jump while bottomed out, then go for it. Otherwise, enjoy the lighter pull of stock.

You can also run 3 stock and 3 HD springs if you want. Stagger them for equal pull.
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djp48
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djp48 11/9/2021 4:00am
11/9/2021 4:00am Edited Date/Time 11/9/2021 4:05am
I think Falcon is dead on.
If your a heavier guy, maybe a larger bore/ extrem mods creating more torque or your experiencing some sort of a holding issue with stock springs you may need to use heavier spring or experiment with a staggered setup.
If your clutch is not slipping un-intentionally than the only thing you are really accomplishing is premature rider fatigue.
The thing about staggering springs on my kx125 is there are only 5 springs. No way for an even stagger. May not cause any negative side effects, but?
I'm going to start by throwing the oem springs back in and see what it do.
Falcon
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Falcon 11/11/2021 8:29am
11/11/2021 8:29am
^You definitely shouldn't run mix-matched springs in a 5-spring setup, then. It's pretty unlikely, but possible that you could wear the plates unevenly. This would result in shuddering and uneven power delivery.

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