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Clutch arm spring mod

59K views 107 replies 43 participants last post by  topdec  
#1 ·
This is becoming a popular mod in the wake of the clutch issues so I thought I'd give it it's own thread encase folk are doing a search for it.

The idea is that the spring helps return the clutch arm positively and eliminates any chance of the plates slipping AS LONG AS YOU HAVE THE CORRECT FREE PLAY IN YOUR CABLE.

It goes on down at the motor end of the clutch cable between the cable mount and the clutch arm. You cut the rubber boot off the exposed part of the cable and thread the spring on. It's a bit fiddly and you may want to give yourself more slack in the cable while you do this.

Spears Racing are doing a spring for this job now at the very reasonable price of $4.99. Scroll right down to the bottom of this page to see the listing: https://www.spearsenterprises.com/ex400.html

I just had a rumage through the random spring box at work and found one about the right diameter. Needs to be able to slip over an 8mm thread.
Unfortunately I cut mine down a little short and found the spring didnt have enough tension on it to make a good difference. So I added an extra lock nut to take up some space and apply more pressure. You can do this by cutting a slot in an 8mm nut with a hack saw just wide enough to slip over the cable. (see 2nd pic). When you tighten the two nuts against each other make sure the slot is to the back and unseen so the job doesn't look too Heath Robinson. :biggrin:





Clutch action feels nice and 'snappy' now and it's good to have a bit more pull to it as it's ridiculously light in std form.
 
#4 ·
I thought the same thing when I ordered mine. But with all the clutch issues I’ve read about I went for it.
I noticed on mine before I put the spring in place, the clutch arm on the trans wouldn’t go all the way back.. Didn’t matter how sloppy I adjusted the clutch lever. The spring pretty much took care of the problem.
I am thinking about tightening it up a little more by doing something like Kiwi did..
over all though, you will notice when you shift and let the lever back out, the clutch grabs better..
How it came from the factory wasn’t fully engaging.. Kinda scary :surprise::surprise:
 
#17 ·
For the sake of $8 postage I would just get the Spears one.
But otherwise you want a spring that has an ID of at least 8mm to slip over the adjusting thread and around 50mm in length. Remember a spring too long can be cut down and slightly short you just add another adjusting nut as I did.
 
#19 ·
Spears shipping is Fedex Express. Fast but not cheap.

Ninja 400r sells a clutch lever spring also, but has a longer pitch. May or may not have a firmer pull compared to the Spears.
 
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#25 · (Edited)
Don't think I've noticed any issues with mine but like other's I might as well order one now it won't hurt to add it and could help if future issues arise I guess?


Edit: If anyone else that gets one wants to take more pics of them going through installing it on there bike that would be awesome. I'm gonna end up having a stack of stuff to put on my bike once riding season comes around in about 2.5 months...
 
#26 ·
Interesting to read the feed back on the Spring....after 40 years in business , we truly understand the cost of goods, went to Home depot and tried several springs, we have a Spring MFG that has been doing our units for decades, so with that we went to them and had them draw us up something that first was made of stainless steel (not a coated zinc spring) next was the purpose and the diameter once this was done we had poundage or pull in the direction of travel and release. Once we were happy with the spring we had to do a few hundred to keep the cost to the point were we could make it right for the end user.

I see a lot of you are so quick to want to run out and to purchase a different spring for less $$$ I get it and welcome it.....our unit is purpose designed and built by engineers...

we are going to lesson the cost of shipping, this is sold in a "per item" one off will now ship for $5.00, this will cover the cost of the envelope, and will not be sent via priority mail, it will be sent first class, and that from the postal it will be between $2.75/$3.50 plus the cost of the envelope.

we are just trying to make items that will make you experience better and not allow you to have any issues with your Kawasaki Ninja 400 (Commuter motorcycle)

again Thank you for the Feed back........Gregg Spears
 
#37 ·
#38 · (Edited)
So I got mine in the mail today (Thanks again Spears Racing! Also thanks for the mint, and stickers.) dropped the girls off at girl scouts came up and pulled the bike out from it's storage spot in the garage for winter. Snapped a few pics of the process I was solo and my garage isn't the brightest and it's in the middle of a winter rain downpour.... But i thought I would share the pics since I was asking for some and other's are also.

On the right side of the bike, there's the rubber boot cut it off. ( I used my carry knife but you can use a razor etc)
Slide one end of the spring on to the cable.
I found it easiest to put my left hand/fingers just on the back side of the cable on the end near the rear of the bike.
Then thread the spring on.
Don't let the spring just flip over the back side which is why I use my left hand to prevent that.
You want it to actually twist and thread on.
And your done new spring mod installed.


Edit: Spears or anyone else want to use these pictures elsewhere feel free too.
 

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#41 ·
Done

I installed the spring I got from Spears Racing, nice touch with the candy and stickers, Mr. Spears! I have a 6x12 trailer I need to fill with stickers! I will be honest, it took me longer than 5 minutes to install. I followed the instructions from Kiwi and the awesome pics from TiggLe and I got the job done. That rubber boot was pretty much just covering the cable not doing anything else. The spring will do a much better job no doubt. Ok guys what’s next, what else needs to be done on these aweomse 400s!!!
 

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#47 ·
I could feel the pull being tighter. But it's not a huge change in the actual pull. Return felt snappy and re-assured me that it will fully release. I never had any of the issues that some have had with there clutch I did this mod just as a pre-caution. I also haven't gotten to take my bike out and ride since adding the spring as I'm in NE Ohio and well it's winter.
 
#52 ·
HotBodies

Must be referring to the spring from HotBodies, which does fit over the rubber boot. Its 19.95 and probably has to be installed the hard way. I prefer cheaper and easier. Even if I didn’t have the Spears one, that’s still the one I would get.:wink:
 
#55 ·
Must be referring to the spring from HotBodies, which does fit over the rubber boot. Its 19.95 and probably has to be installed the hard way. I prefer cheaper and easier. Even if I didn’t have the Spears one, that’s still the one I would get.
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But couldn’t this make the clutch cable wear down faster without the boot protecting it from elements?