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fastback longrange tank mounting

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fastback longrange tank mounting

Posted by richard_woolnough at October 07. 2017

O.K I have the 'tins' back from paint, I have just dry mounted the tailpiece, the seat doesn't fit it well so will have to sort it out, the tank I have not tried yet but I do not know  quite what I need to mount it on the frame, cotton reel supports at the front I think but is there not a large rubber piece that sits under it and on the frame? any advice will be gratefully received. kind regards

Re: fastback longrange tank mounting

Posted by john_holmes at October 07. 2017

Cotton reels on front but be prepared to add one of the rubber washers in addition depending on getting the height right. There are 2 rubber pads in the over frame recess the part numbers can be got from the Andover Norton page for the tanks, use the ones for the Interpol tank which is the same tank but with a radio cutout..

 

https://andover-norton.co.uk/en/shop-drawing/190/fuel-tanks

Re: fastback longrange tank mounting

Posted by richard_woolnough at October 09. 2017

thans John, I have just noticed the tank still has it's cotton reels but I have mailed Andover for the bits required, however the damn seat won't fit, the seat came from Ken with the tank but it will not sit in the curvature of the tail fairing, looking at it it appears to be to shallow at the curve, I have taken the cover off and will try to add a little to the bend, the old fastback seat sits in O.K. I don't want to butcher it if I can help it. on another note I assume the tail fairing sits under the mounting stud and against the suspension bracket

kind regards

Re: fastback longrange tank mounting

Posted by richard_woolnough at October 09. 2017

more simple queries from me again, firstly are there small perhaps rubber feet which  fit in the bottom of the spacing squares under the seat then sit on the frame members? and I'm afraid I am gonna have to butcher the original seat by cuting off the forward ears because as mentioned the replacement just will not sit correctly the retaining 'ears' are at least 1" forward of the retaining studs if it does, .any suggestions or advice will be welcome, phew I though a 'modern' bike would be easy! kind regards

Re: fastback longrange tank mounting

Posted by john_holmes at October 10. 2017

I sent a different way, I took an Interstate seat and ground the welds off the mounting ears to release them and the bolted them some 2 inch back to move the seat forward. No Fastback rear fairing to worry about but not a Fastback look either. The seat has 8 rubber pads to protect the frame/mudguard and spread the load.

Re: fastback longrange tank mounting

Posted by alex_arthur at October 10. 2017

I have contemplated changing my Commando to the fastback arrangement but in my research I have seen more than one seat that wouldn't fit.  In one case I watched a new seat being brought from the stores to a potential customer's bike and the owner then attempting to fit it.  The curve of the seat rear section didn't match the glass tailpiece and the mounting tongues were in the wrong place to allow the seat to be moved fore/aft to make it fit where it touched.  If the seat is disassembled it may be possible to re-manufacture the parts (I am in the process of doing exactly that for my Dommie to get the correct fit) so that they better match the bike.

Re: fastback longrange tank mounting

Posted by david_evans at October 10. 2017

The Fastback Long range seat does not have the ears that go either side of the back of the tank, if that's what we are talking about here. I also had to cut the mounting "forks" off my standard fastback tank and move them back about 20mm to get the seat back far enough to clear the back of the tank.

Re: fastback longrange tank mounting

Posted by richard_woolnough at October 10. 2017

sorry David you are confusing me, do you mean the ears on the seat?, I don't have any ears on my tank, anyway the seat appears to have two receptacles for rubber feet behind the ears, I think I will obtain some thick rubber and try to make some buttons for the seat to sit on against the frame., I  won't do anything untli the bits from Andover arrive, however am I right in assuming the rear fairing fits adjacent to the suspension mounts? and having compared the curvature of both seats the non forward eared one certainly has a different and further back curvature by at  least an 1" kind regards

Re: fastback longrange tank mounting

Posted by john_holmes at October 10. 2017

The mounting ears I was referring to are the ones that engage with the alloy seat retaining knobs.

Re: fastback longrange tank mounting

Posted by richard_woolnough at October 11. 2017

Hello John, yes these are what I was also referring to, unfortunately the rear upward curvature  begins an inch or so behind these on the cut seat I could cut and reweld the 'ears' but the shape at the rear of the seat would still be wrong

'nother point ther  appears to be only one place each side that a rubber buffer, thats a more correct  term I think, could be accomodated there are  no brackets  forward, however the front of the seat is very close to the top of the oil tank so I will try to place some kind of buffer here and maybe a few from here to the rearmost one.

Kind regards

Re: fastback longrange tank mounting

Posted by richard_woolnough at October 13. 2017

hi guys, well I have cut the seat and it does sit better, I shall use the cover off the incorrect one I think,

I am puzzled though to how the tail  fairing fits, it seems to stand off a tad from the top suspension mountings, should there be a small washer/distance piece between the fairing 'ear' and the frame pse? kind regards

Re: fastback longrange tank mounting

Posted by david_evans at October 13. 2017

The fibreglass should sit next to the frame. It does seem alien to clamp your top suspension mounts onto a piece of fibreglass. If a washer would make the ear sit better I would use one if there is enough length on the screw.

Re: fastback longrange tank mounting

Posted by richard_woolnough at October 13. 2017

thanks for that David, I have placed a washer between the ears and the frame also a fibre one between the 'ear' and the retaining bolt, popped it all back together, rear number plate etc,  but havn't really connected any wires as the painter wants the tank and tail piece back to 'nib off,' damn nuisance really but the bike having slumbered for in excess of 20 yrs a  few more weeks/months won't hurt I'm sure. kind regards

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