New Rider
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Posts: 29
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Joined: Mar 26, 2014 3:24:33 GMT -5
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Post by zoom on Apr 28, 2014 13:55:47 GMT -5
undid 3 bolts from my intake manifold, turned out that the 4th bolt was shaped like a ufo, the top of the bolt was a perfect cylinder. Is this normal at the scooter factory that they put in these for a laugh sometimes? I managed to unscrew the ufo bolt by pressing the manifold up onto it to grip it clockwise and then turn back anticlockwise. very confused, what it is? other than antitheft reasons, i dunno why they had that there.  it was one of these:  |
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Post by earlwb on Apr 28, 2014 14:30:12 GMT -5
I think that when the engine was being assembled the bolt head got stripped off by the air wrench. Likely a worn socket tool. The bolt head was likely defective to some extent as well which would contribute to it. They aren't deliberately putting in anti-theft bolts or screws yet, as far as I know. But if you could unscrew it by using the manifold piece then it was a defective bolt and it wasn't screwed in tight in the first place.
The factory has the assemblers use air wrenches as much as possible and they preset the torque settings for the bolts or screws being used at that point on the assembly line.
The variator nut and clutch nut are the ones that they really torque down on hard though.
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New Rider
Currently Offline
Posts: 29
Likes: 3
Joined: Mar 26, 2014 3:24:33 GMT -5
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Post by zoom on Apr 28, 2014 18:13:41 GMT -5
Thanks that's very informative indeed. It was so perfectly rounded i didn't know what kind of machine could make that kind of wear mark on it.
Info on the variator nut is very interesting, i found a video that says that you can stuff soft rope into the spark plug hole in order to block the cylinder from coming all the way up, which blocks the variator from going all the way round. nice one!
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Post by earlwb on Apr 29, 2014 10:59:26 GMT -5
I fabricated my own DIY variator wrench tool for holding the variator or the clutch still so I could loosen the nut. The rope method works on the variator but the clutch is a different issue. A long breaker bar is a requirement in any case. Do use the six point sockets, don't use the finer toothed sockets, as the nut is made from softer steel and the six point socket grips the flats and not the points that are easy to round off. Actually for all of the bolts on the scooters it is wise to use the six point sockets on all of them.
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