vennu Posted April 1, 2015 Report Share Posted April 1, 2015 Hello!! I just bought my first trials bike and its most fun toy i ever owned. But the problem is that my chain jumped when i was riding in the woods and tangled around the front sprocket and broke off the nipple in front off the sprocket. I´m wondering if my only option is to split the engine case and extract the broken nipple or is there any other solution for this problem. Best regards Verneri from Finland Quote Link to comment Share on other sites More sharing options...
bilks Posted April 1, 2015 Report Share Posted April 1, 2015 You could try draining the transmission fluid and hope it comes out with the oil. Quote Link to comment Share on other sites More sharing options...
crazybond700 Posted April 1, 2015 Report Share Posted April 1, 2015 Yeah, thats a little bit weak design. You can try flushing it and see if the magneto catches it. Otherwise you need to open it... Not that much work, but riding is more fun! lol Quote Link to comment Share on other sites More sharing options...
vennu Posted April 2, 2015 Author Report Share Posted April 2, 2015 I´ve been trying to get the broken peace down into the gearbox with sticks, shaking and blowing air with a compressor in the hole with both oil-drain and oil-screw open to get maximum air flow and to not blow any seals, but no it only moves back and forth. How can I get the broken nipple down the gearbox or is it designed so that the broken peace can´t fall down the gear box and destroy anything? Best regards Verneri Quote Link to comment Share on other sites More sharing options...
aussiechris Posted April 2, 2015 Report Share Posted April 2, 2015 If that broken nipple has gone inside then it should still be contained within the hollow transmission primary shaft. The left hand bearing of that shaft surrounds the breather. The clutch is attached to the right hand end and the clutch retaining screw has a small hole to allow breathing but would be too small to allow that nipple to escape. You could try the following: Remove the clutch cover, then remove the small allen screw in the centre of the clutch (it's either 4mm or 5mm internal hex but I can't remember). Then you should have access to the nipple inside the hollow shaft. But I still don't know if you will get it out through the screw hole. Otherwise you can either leave it in there or you'll need to split the engine to remove it from the left side of the primary shaft. These pics show the left end of the shaft and the bearing it sits in (the hole is where your nipple belongs). Unfortunately, I don't have any good shots of the clutch end. Chris Brisbane Australia. Quote Link to comment Share on other sites More sharing options...
crazybond700 Posted April 2, 2015 Report Share Posted April 2, 2015 Chris is right yes, offcoarse. The breather is breathing through the clutch bold, and so has fallen inside the shaft. I think you will need to disassamble to take it out. Quote Link to comment Share on other sites More sharing options...
vennu Posted April 2, 2015 Author Report Share Posted April 2, 2015 So the broken breather can't fall down into the transmisson and brake something? I will try to remove that broken breather by following aussichriss advice. What have you replaced that breather with ,a new one? Thanks for fast replies and good advice!! Regards Verneri Finland Quote Link to comment Share on other sites More sharing options...
crazybond700 Posted April 2, 2015 Report Share Posted April 2, 2015 (edited) No, its inside the left tube on the picture above. The other end of that tube is where your clutch is mounted on. /offtopic from where in finland are you? Edited April 2, 2015 by crazybond700 Quote Link to comment Share on other sites More sharing options...
aussiechris Posted April 2, 2015 Report Share Posted April 2, 2015 I forgot to mention - after removing the clutch retaining bolt, you can remove the whole clutch in one piece to gain better access. However, having thought about it, I seriously doubt you will be able to recover the broken part from inside the shaft. The clutch bolt is listed as M5x20 meaning it's a 5mm outside diameter bolt. That means the hole you have to work through is only 4.2mm and I think the broken part of the nipple will be larger than that. Check the hole diameter where the nipple goes and you'll have your answer. Don't sue me if something goes wrong, but I can't see how the part would ever escape into the transmission and do any harm so I would be tempted to leave it in there. Are you sure that it has gone inside and didn't just get torn out? Just replace with another nipple. Genuine part number is MIT50010012 - should cost about 5 Euro. All the best, Chris. Quote Link to comment Share on other sites More sharing options...
vennu Posted April 2, 2015 Author Report Share Posted April 2, 2015 I got a idea how to get the nippel out without splitting the enginecases, I will tell you if it worked out. //I'm from the other side of Finlands longest bridge. https://youtu.be/CckLkhnrF14 Here is a short video of how the nature is here on this island. Quote Link to comment Share on other sites More sharing options...
steve_earle Posted April 3, 2015 Report Share Posted April 3, 2015 If it stays in the shaft it will do no harm, If I remember correct the nipples are alloy so a magnet won't work. I'd leave it then wait till you have to do a strip down and then retrieve it then. Quote Link to comment Share on other sites More sharing options...
biffsgasgas Posted April 4, 2015 Report Share Posted April 4, 2015 If it stays in the shaft it will do no harm, If I remember correct the nipples are alloy so a magnet won't work. I'd leave it then wait till you have to do a strip down and then retrieve it then. I agree. The tube won't do any harm. If it's still in the case then why not pull it out rather than push it in? Small hook that fits inside the I'd of the tube will work. Biff Quote Link to comment Share on other sites More sharing options...
crazybond700 Posted April 6, 2015 Report Share Posted April 6, 2015 I got a idea how to get the nippel out without splitting the enginecases, I will tell you if it worked out. //I'm from the other side of Finlands longest bridge. https://youtu.be/CckLkhnrF14 Here is a short video of how the nature is here on this island. Beautifull!! Havent been there, only the eastside up untill the very north and back again trough suomussalmi Quote Link to comment Share on other sites More sharing options...
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