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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Petrol Tank Fit
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<blockquote data-quote="davidd" data-source="post: 55169" data-attributes="member: 1177"><p>Well, you make a very compelling argument that they are original by having two tanks with the same front mounts. Also, they seem well thought out. I do not have much experience with the very early tanks without the steady tabs and the pump mounts. I have owned the small carb cut-out tanks, but they had the other two items. So, assuming it is original to the earliest of the post-war tanks and it is correct, also assuming nothing looks bent, it would seem that the fit is off for some other reason.</p><p></p><p>I wonder if the tightness going over the oil tank is not a result of the two halves of the tank "clam shelling" inward a bit. You may not want to put up with the fix of stretching outward slightly and just put up with the bother of the tight installation.</p><p></p><p>This still would not account for the tank being too high and too far forward. Is it possible that these early tanks were more "custom" fitted than the later tanks. In other words, if you don't put in the rear bolts and you don't care about the oil hole, can you get the front bolt hole centered? It does not look like this will work. It looks like the tank may not go low enough. If so, I think I would cut the mounts off and re-weld them. I know this does not sound good, but I once painted a D tank before I realized the rear mounting tab was missing. I welded it on with no damage to the paint outside the little pocket. These early mounts of yours are not welded to the seam except for two spots, so most of the welding is on the tunnel which will never show. This can all be done with damp rags and stitch welding. If this is a correct original item it is certainly worth preserving, even if it needs some adjustment.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 55169, member: 1177"] Well, you make a very compelling argument that they are original by having two tanks with the same front mounts. Also, they seem well thought out. I do not have much experience with the very early tanks without the steady tabs and the pump mounts. I have owned the small carb cut-out tanks, but they had the other two items. So, assuming it is original to the earliest of the post-war tanks and it is correct, also assuming nothing looks bent, it would seem that the fit is off for some other reason. I wonder if the tightness going over the oil tank is not a result of the two halves of the tank "clam shelling" inward a bit. You may not want to put up with the fix of stretching outward slightly and just put up with the bother of the tight installation. This still would not account for the tank being too high and too far forward. Is it possible that these early tanks were more "custom" fitted than the later tanks. In other words, if you don't put in the rear bolts and you don't care about the oil hole, can you get the front bolt hole centered? It does not look like this will work. It looks like the tank may not go low enough. If so, I think I would cut the mounts off and re-weld them. I know this does not sound good, but I once painted a D tank before I realized the rear mounting tab was missing. I welded it on with no damage to the paint outside the little pocket. These early mounts of yours are not welded to the seam except for two spots, so most of the welding is on the tunnel which will never show. This can all be done with damp rags and stitch welding. If this is a correct original item it is certainly worth preserving, even if it needs some adjustment. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Petrol Tank Fit
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