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Post by jeff84 on Nov 27, 2018 22:17:28 GMT -5
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Post by oldgeek on Nov 27, 2018 22:19:28 GMT -5
Too Much POWA
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Post by SMALL CC TEK on Nov 27, 2018 23:28:57 GMT -5
POOF goes the belt and contra ! LLOL
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Post by jeff84 on Nov 27, 2018 23:56:48 GMT -5
didnt really hurt the belt. just made the back wheel lock up
i replaced the spring and am hoping it dont happen again. just wish i knew why it happened in the first place.
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Post by oldgeek on Nov 28, 2018 0:04:36 GMT -5
TBH I have never seen that before. I have noticed contra springs wound in both directions. IMO the one you destroyed is wound in the wrong direction. It looks like it may have got hung up and unwound?
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Post by jeff84 on Nov 28, 2018 0:22:09 GMT -5
i just thought it was odd. like you said i have never seen it before. it happened just as i came off the throttle after cruizing at wot for a bit. hopefully it can be chalked up to a fluke and it never happens again.
what makes it worse is i left it on the sife of the road for a bit and some jackass thought it was free for the taking. luckily i live in a small town and was able to track it down.
the lock on the seat is now broke so i cant get in there and my glovebox got pryed open even though it wasnt even locked.
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Post by gsx600racer on Nov 28, 2018 0:41:12 GMT -5
My only guess would be if the spring diameter was a tad too big and did not fit properly. The rotational forces cause the spring to slowly unwind itself or maybe the spring temper was too soft.
Crazy stuff tho.
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Post by oldgeek on Nov 28, 2018 7:50:36 GMT -5
i just thought it was odd. like you said i have never seen it before. it happened just as i came off the throttle after cruizing at wot for a bit. hopefully it can be chalked up to a fluke and it never happens again. what makes it worse is i left it on the sife of the road for a bit and some jackass thought it was free for the taking. luckily i live in a small town and was able to track it down. the lock on the seat is now broke so i cant get in there and my glovebox got pryed open even though it wasnt even locked. WTF....people! I would have to break his "seat lock" and pry his "glovebox" open!
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Post by FrankenMech on Nov 28, 2018 10:45:00 GMT -5
I have seen many springs fracture for a variety of reasons, -stuff happens.
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Post by snaker on Nov 28, 2018 12:11:31 GMT -5
That gy6 setup is what I refer to as bad engineering design by using a compression spring where a combination compression / torsion spring should be used. This design is what should be used. This can handle the compression action (lateral movement of the moveable sheave) and the torsion action (rotational movement of the moveable sheave). Hard to say what the cause of this was. I noticed the end of the spring in your first photo looks like it was put to a grinder. Had to of been some heavy digging/ binding there. As mentioned, defective spring, wrong spring dimensions, coil binding. Is there a chance that the Torque Sensing pins were missing ,broken? Were both of the spring cups in place?
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Post by snaker on Nov 28, 2018 12:38:00 GMT -5
TBH I have never seen that before. I have noticed contra springs wound in both directions. IMO the one you destroyed is wound in the wrong direction. It looks like it may have got hung up and unwound?
This is a photo I took while looking things over on my setup. I removed the contra spring and reassembled. The two white paint dots align when the sheaves are closed completely. The photo is at full open. I don't think there is enough rotation for opposite spring wind to be a problem if all else is proper. But if the spring was sort of catching and releasing it might have been ratcheting itself open as GXS mentioned.
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Post by jeff84 on Nov 28, 2018 13:20:39 GMT -5
whatever the problem it developed over time, this setup was run almost daily for 2000 miles or so. perhaps the spring did become soft over time. I swapped back in the stock spring for now. that was I believe a 1500 polini spring that failed.
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Post by FrankenMech on Nov 28, 2018 21:04:04 GMT -5
I have heard some discussions on using bearings to prevent torsional spring windup from influencing contra action. The ends of the contra springs are ground flat to prevent them from digging in like lockwashers.
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Post by Happypancake! on Nov 28, 2018 21:08:00 GMT -5
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Post by snaker on Nov 28, 2018 22:35:25 GMT -5
That is something that does address the design deficiency. If the pulley manufacturer included something like it in the stock configuration along with a properly sized spring I would call it reasonable. But the aftermarket stuff is something of a bandaid fix IMO. It takes up space meant for the spring. I looked these products up before and have never seen any mention of mfgs, vendors or customers doing any measurements or testing to see if there is even room available without causing coil bind with various springs. As mentioned it adds preload and makes whatever spring that is in there act like a completely different spring.
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