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  1. #21 Re: Benelli BJ600GS - lessons learned 
    C-Moto Not-so-Noob
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    Quote Originally Posted by SammyDV View Post
    750km: One screw and its bolt at the sprocket (back wheel) slip.
    Wheel was dismantled and sprocket detached today. The bolt is secured by two nuts (front and back of the sprocket). Problem was part of the bolt's winding was filled with hard glue and "dirt". This produced enough resistance and even with an impact wrench the screw stopped a few turns too early.
    Seems to be that at the factory the glue was added but hardened already before the screw was attached. Hence a Quality Control issue...

    Below some photos of the socket and wheel.
    Sprocket_Inside.jpg
    Sprocket_Outside.jpg
    Wheel_JerkDamper.jpg
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  2. #22 Re: Benelli BJ600GS - lessons learned 
    Duc's and Cat's 998S's Avatar
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    What you are talking about is called the Cush-drive.
    The heads of the allen-bolts fit exactly in the rubbers of the cush-drive, allowing for some shock absorption.
    Consequently, these bolts only face shear-forces, no pushing or pulling.
    The fact that the nut was not up to spec is not good, but could have caused very little damage.
    Perhaps that offers some peace of mind
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  3. #23 Re: Benelli BJ600GS - lessons learned 
    Senior C-Moto Guru Zorge's Avatar
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    Did you check the state of these five pieces of rubber?

    No hidden cracks or deformation?
    Ask me nothing - I DO NOT speak english. Really...
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  4. #24 Re: Benelli BJ600GS - lessons learned 
    Life Is Good! ChinaV's Avatar
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    That does not look like a very robust cush drive. The casting of the spokes on the rims looks very thin as well. Not that both of these things aren't good designs, I just feel that it requires top notch materials for either design to perform well. Time will tell.

    Cheers!
    ChinaV
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  5. #25 Re: Benelli BJ600GS - lessons learned 
    Senior C-Moto Guru ZMC888's Avatar
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    I wouldn't get so upset just because someone in the factory mistakenly gave the loctite 243 a bit too long to dry before they attached a bolt. I mean they are a actually using Loctite!
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  6. #26 Re: Benelli BJ600GS - lessons learned 
    Duc's and Cat's 998S's Avatar
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    Sweet
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  7. #27 Re: Benelli BJ600GS - lessons learned 
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    Quote Originally Posted by 998S View Post
    Consequently, these bolts only face shear-forces, no pushing or pulling.
    The fact that the nut was not up to spec is not good, but could have caused very little damage.
    Besides that they also hold the sprocket in place.

    Several designs are used in the industry, see attached drawing. Here a slipping screw could have been because of a broken bolt (#13).
    honda-xl185s-1982-usa-rear-wheel_mediumhu0118f7z11_9d58.jpg

    If the design is known better analysis could be possible before dismantling. X-ray eyes would be helpful too. Hindsight is 20/20.
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  8. #28 Re: Benelli BJ600GS - lessons learned 
    Duc's and Cat's 998S's Avatar
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    Quote Originally Posted by SammyDV View Post
    Besides that they also hold the sprocket in place.
    No, they don't.
    The sprocket carrier is loose from the wheel.

    If you take the wheel out, you can lift the sprocket carrier (only need to overcome some friction of the bolts in the rubber).

    The whole assembly is held together by the axle, the swingarm and spacers on each side of the wheel / carrier.
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  9. #29 Re: Benelli BJ600GS - lessons learned 
    C-Moto Not-so-Noob
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    Quote Originally Posted by 998S View Post
    No, they don't.
    The sprocket carrier is loose from the wheel.
    Want to see you driving with the screws detached...
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  10. #30 Re: Benelli BJ600GS - lessons learned 
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    Quote Originally Posted by ZMC888 View Post
    I wouldn't get so upset...
    That's not the point, isn't it? Or don't you get it? But maybe you are not interested in reading a field report. Or maybe it is just the wrong forum. If at all that's what could make me upset, wasting time and energy for...
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