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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Petrol Tank Bolts
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<blockquote data-quote="kettlrj" data-source="post: 106754" data-attributes="member: 1455"><p>I have machined my own front tank bolts with a little extra length on the plain diameter, an extra 1/8" of thread length and a 1/8" long plain lead in (diameter of thread root). These feed into the UFM thread very easily having been centralised by the lead-in diameter. I am running with an Indian made tank after my ex Argentinian tank gave up and started to leak around the rear mounting. The Indian tank came with the rear mounting pad incorrectly made and quite weak. I cut this out and fabricated a new one out of 4mm plate which gives greater strength to the back of the tank. This allows me to mount the rear of the tank on two anti-vibration mounts (the type with a central rubber element and a stud at either end). This lifts up the rear of the tank and means that the cross tube cannot be fitted. This is not a problem with the stronger rear mounting pad. I think that the original mounting using the two rubber pads is too stiff and is the cause of leaks in this area. The A/V mounts provide more flexibility and do not stress the tank so much. Time will tell if I am right.</p><p>Regards Richard.</p></blockquote><p></p>
[QUOTE="kettlrj, post: 106754, member: 1455"] I have machined my own front tank bolts with a little extra length on the plain diameter, an extra 1/8" of thread length and a 1/8" long plain lead in (diameter of thread root). These feed into the UFM thread very easily having been centralised by the lead-in diameter. I am running with an Indian made tank after my ex Argentinian tank gave up and started to leak around the rear mounting. The Indian tank came with the rear mounting pad incorrectly made and quite weak. I cut this out and fabricated a new one out of 4mm plate which gives greater strength to the back of the tank. This allows me to mount the rear of the tank on two anti-vibration mounts (the type with a central rubber element and a stud at either end). This lifts up the rear of the tank and means that the cross tube cannot be fitted. This is not a problem with the stronger rear mounting pad. I think that the original mounting using the two rubber pads is too stiff and is the cause of leaks in this area. The A/V mounts provide more flexibility and do not stress the tank so much. Time will tell if I am right. Regards Richard. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Petrol Tank Bolts
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