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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Petrol Tank Bolts
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<blockquote data-quote="greg brillus" data-source="post: 106725" data-attributes="member: 597"><p>A couple of observations, The bolts should be done up tight, or else they will vibrate loose .......... the shoulder or step on the bolt is very narrow, sometimes these seem to have carved their way part way down the threaded hole. This makes tightening the bolts a problem as it compresses the rubber mount too much. One easy way to fix this is to simply replace the correct part F 81 with the slightly longer FT 84 footrest hanger pivot bolt, and shim as required using slightly thicker washers under the head. Sometimes on some tanks the forward mounting lugs are too close together, and bending them apart is none too easy........You can linish down part of the larger section of the rubber mounts FT 80 so the smaller diameter part of the rubber passes through the tank mount more so. It is not desirable to overload these mounts, and it is worth simply modifying the rubber mounts to allow this............. Equally as important is the rear mount, if this is overloaded you will end up with cracks and fuel leaks from this area. A correctly mounted tank is one that can be grabbed from either side and the tank moved about so as to compress the rubbers, but also that does not mechanically touch on anything very rigid, such as some parts of the upper frame member, or many instances where the tank undersides are resting on the top of a crash bar. This will cause bad vibrations through the bike and can easily wear through the welded seam along the length of the outer base of the tank.............. Again resulting in a fuel leak.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 106725, member: 597"] A couple of observations, The bolts should be done up tight, or else they will vibrate loose .......... the shoulder or step on the bolt is very narrow, sometimes these seem to have carved their way part way down the threaded hole. This makes tightening the bolts a problem as it compresses the rubber mount too much. One easy way to fix this is to simply replace the correct part F 81 with the slightly longer FT 84 footrest hanger pivot bolt, and shim as required using slightly thicker washers under the head. Sometimes on some tanks the forward mounting lugs are too close together, and bending them apart is none too easy........You can linish down part of the larger section of the rubber mounts FT 80 so the smaller diameter part of the rubber passes through the tank mount more so. It is not desirable to overload these mounts, and it is worth simply modifying the rubber mounts to allow this............. Equally as important is the rear mount, if this is overloaded you will end up with cracks and fuel leaks from this area. A correctly mounted tank is one that can be grabbed from either side and the tank moved about so as to compress the rubbers, but also that does not mechanically touch on anything very rigid, such as some parts of the upper frame member, or many instances where the tank undersides are resting on the top of a crash bar. This will cause bad vibrations through the bike and can easily wear through the welded seam along the length of the outer base of the tank.............. Again resulting in a fuel leak. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Petrol Tank Bolts
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