Question(s) about clutch springs
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Question(s) about clutch springs

This is a discussion on Question(s) about clutch springs within the Grom Performance forums, part of the Honda Grom Garage category; Hey everybody, just bought a 2015 Grom from a buddy of mine. Had about 300 miles on it at the time, sitting around 400 miles ...

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Thread: Question(s) about clutch springs

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    Question(s) about clutch springs

    Hey everybody, just bought a 2015 Grom from a buddy of mine. Had about 300 miles on it at the time, sitting around 400 miles now. This is my first Grom and my first time on the forum by the way, so apologies in advance if I'm asking stupid questions. My plan is mostly going to be for wheelies and stunting. It came with a 13t sprocket, and I have a 14t ready to go. After doing some research, I figured my next mod should be to upgrade the clutch springs and possibly the plate(and the oil pump but finding info on that was pretty straightforward).

    So here's what I'm trying to figure out. Would you guys recommend 15%, 30%, or 60% stiffer springs? Believe me, I found plenty of info on all of these, but my bike is BONE stock except for the front sprocket. Is there any reason going too stiff would mess anything up or cause any unnecessary wear and tear when less stiffness should do the trick? This is the only thing I wasn't able to specifically find while searching, recommendations for a completely stock bike. Any and all help is appreciated, look forward to talking to you all.

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    Stock springs should be strong enough to handle stock power. I don't think it hurts anything to put stiffer springs in though. Just makes the clutch lever stiffer to pull. I have the stock plate with 50% springs. I don't think the billet plate is necessary.

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    The only thing stiff springs are going to wear is your hand. LOL

    Most Grom stunters recommend 60% stiffer springs. I have not felt how stiff that is at the lever. But with 60% springs most people recommend that aftermarket plate because it can break. There are no guarantees that it will break, but it's cheap insurance and you might as well replace it when you have the clutch apart to replace the springs.

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    It's kind of like driving a mustang. If you have a stock motor, the stock clutch is fine. If you put twin turbos in it, you need a stronger clutch. Can you put the heavy duty clutch on the stock mustang? Yeah, but it won't really make it any faster.

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    Stock Grom clutch is weak! I have never felt such a weak clutch. I have heard it slip on quick shifts at high RPMs on a stock motor (with an RS2 pipe), and forget about good (easy) wheelies. The Grom needs stiffer springs unless you just want to toot around town (who does that?). I have 60% and a billet clutch lifter plate. I agree with others that you should replace the plate if you put in stiffer springs. It is pretty cheap to do and is easy to undo if you don't like it.

    Now don't go doing long wheelies with a new clutch if you don't also upgrade the oil pump. Oh, and you might as well replace the engine side clutch cover to upgrade the oil filter and remove the spinner. Oh, and...
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    Quote Originally Posted by S1930 View Post
    Stock Grom clutch is weak! I have never felt such a weak clutch. I have heard it slip on quick shifts at high RPMs on a stock motor (with an RS2 pipe), and forget about good (easy) wheelies. The Grom needs stiffer springs unless you just want to toot around town (who does that?). I have 60% and a billet clutch lifter plate. I agree with others that you should replace the plate if you put in stiffer springs. It is pretty cheap to do and is easy to undo if you don't like it.

    Now don't go doing long wheelies with a new clutch if you don't also upgrade the oil pump. Oh, and you might as well replace the engine side clutch cover to upgrade the oil filter and remove the spinner. Oh, and...
    The stock clutch shouldn't be slipping with just a pipe. Are you sure it's adjusted properly?

    I sometimes notice the clutch seems like it's slipping when I release the lever too slowly during fast shifts. Other than that it's fine. It'll even work clutching up wheelies. I'm on the stock displacement motor, but I have the Yoshi RS-2, Dinger Built mid length intake, and the Dynojet PV3.

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    Quote Originally Posted by 50-50 View Post
    The stock clutch shouldn't be slipping with just a pipe. Are you sure it's adjusted properly?

    I sometimes notice the clutch seems like it's slipping when I release the lever too slowly during fast shifts. Other than that it's fine. It'll even work clutching up wheelies. I'm on the stock displacement motor, but I have the Yoshi RS-2, Dinger Built mid length intake, and the Dynojet PV3.
    Yeah, both of my Groms are adjusted correctly, but one slips more than the other. I can pull the clutch with the stock springs with my pinky, they are so weak. Yes, my stock clutches bring up wheelies, just not that easily since it is so weak. Mine only slip when shifting very quickly (dumping the clutch) at high speed and RPMs and very low speed at high RPMs. It sounds like Groms vary from bike to bike when it comes to performance, including the clutch. The springs are certainly the weak part, and that is probably by design due to the intended market. Easy fix with replacing the springs and lifter plate.

    My Ducati has the opposite issue. That race clutch is so strong that I had to install a bigger slave. That clutch just about snaps your neck when you release it. The quick shifter helps a ton, especially with the Ducati Power Launch!
    Last edited by S1930; 10-31-2019 at 02:25 PM.
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    Quote Originally Posted by S1930 View Post
    Yeah, both of my Groms are adjusted correctly, but one slips more than the other. I can pull the clutch with the stock springs with my pinky, they are so weak. Yes, my stock clutches bring up wheelies, just not that easily since it is so weak. Mine only slip when shifting very quickly (dumping the clutch) at high speed and RPMs and very low speed at high RPMs. It sounds like Groms vary from bike to bike when it comes to performance, including the clutch. The springs are certainly the weak part, and that is probably by design due to the intended market. Easy fix with replacing the springs and lifter plate.

    My Ducati has the opposite issue. That race clutch is so strong that I had to install a bigger slave. That clutch just about snaps your neck when you release it. The quick shifter helps a ton, especially with the Ducati Power Launch!
    Interesting.

    Yes, the Grom clutch pull is laughably light. When I get on my Buell it feels like I'm doing hand exercises.

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    60% springs for wheelies. It's not as bad as these guys make it out to be. I run all 6 60% stiffer springs, the clutch lever didn't get to be heavy until I added another steel plate to the clutch pack. A child could still comfortably ride it with all 60% springs installed.

    If you really want to stunt it, especially if you wanna ride streets, you need every last bit of pop when you drop that clutch. The pack isn't gonna slow down for you to pop 1st and shift 2nd cause you don't have the bite to pick up 2nd. No lower than 14t sprocket up front. If it's a lot bike only, different story.

    Sent from my SAMSUNG-SM-G935A using Tapatalk
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    Thank you all so much. Looks like I'll be going with 60% springs and a plate based on your recommendations.

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