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Rear fastening for slimline fuel tank

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Rear fastening for slimline fuel tank

Posted by Chas Goupillot at February 12. 2017

Hi all,

The rear of the petrol tank on my Mercury, as purchased, was secured by a thick elastic band looped over a small bracket at the bottom rear of the tank and looped under a bracket on the frame.

The bracket on the frame is drilled as if to take some kind of fitting.

I am not happy with the current set-up but can't find any pictures showing alternatives.

Not too bothered about originality, but ease of fitting and improved security would be nice!

Any thoughts would be appreciated,

Best regards,

Chas

Re: Rear fastening for slimline fuel tank

Posted by robert_tuck at February 12. 2017

Frame fitting ? o;d coil mounting?.  I use elastic tent ties from the camping /caravan shop,

Re: Rear fastening for slimline fuel tank

Posted by Gordon Johnston at February 12. 2017

I use a Hoover drive band.

Re: Rear fastening for slimline fuel tank

Posted by robert_tuck at February 12. 2017

Previously Gordon Johnston wrote:

I use a Hoover drive band.

This could be the start of a really usefull thread!, What other non Norton parts have members incorporated into their bikes?. Fibre plumbing washers seal the slider/damper bolts. Clingfilm seals the seat foam under that new cover. Duct tape will work as a rim tape.

Re: Rear fastening for slimline fuel tank

Posted by thane_gillies at February 13. 2017

The original fastener was a large thick o-ring. I get replacements from a local hydraulic repair shop and use two at a time for extra strength.

Re: Rear fastening for slimline fuel tank

Posted by steve_adkins at February 13. 2017

Gentlemen,

 

Any idea what size 'O' ring (s)? Currently using bungee cord for ute / pick up cover tie downs, works fine and its black too but probably similar to the camping option? Also doubled up with a reef knot!

 

Thanks

 

Steve

Re: Rear fastening for slimline fuel tank

Posted by Fritz Wettstein at February 13. 2017

AN have the o-ring part # NM16237.

I have done it this way:

Fritz

Attachments

Re: Rear fastening for slimline fuel tank

Posted by anna jeannette Dixon at February 13. 2017

hello the O-ring of slimline tanks is 1.1/4 inch in diameter  and fits on a bobbin under the rear of the tank the bobbin is fitted the a down looking bracket in the mid way of rear cross tube  looking forward  and there should be two rubbers for the rear of the tank to sit on , yours anna j 

Re: Rear fastening for slimline fuel tank

Posted by Chas Goupillot at February 13. 2017

Thanks Anna,

That's the information I was looking for, just need to source a bobbin now. That should do away with some of the sharp edges which seem detrimental to the life of a rubber band.

Thanks to all for suggestion for replacement rubber bands.

Best regards,

 

Chas

Re: Rear fastening for slimline fuel tank

Posted by David Cooper at February 13. 2017

Any chance of a picture, Anna? Mine is like Fritz. ..but like Robert I use a Hoover drive band 'O' ring and no need for the twist. Been there for years and never worried about it.

Re: Rear fastening for slimline fuel tank

Posted by john_evans1 at February 13. 2017

I find the O ring from old car oil filters work fine.If too big,just arrange them in a figure 8. Never had one fail.They are black and unobtrusive. Best of all they are free!

Re: Rear fastening for slimline fuel tank

Posted by anna jeannette Dixon at February 14. 2017
Previously Chas Goupillot wrote:

Thanks Anna,

That's the information I was looking for, just need to source a bobbin now. That should do away with some of the sharp edges which seem detrimental to the life of a rubber band.

Thanks to all for suggestion for replacement rubber bands.

Best regards,

 

Chas

Hello Sorry I have No photo capabilities As yet   On my computer   I have tried a few things but the computer does not what to upload them    but from the head stock move aft to the rear of the frame  where the oil tank and battery box are situated and there is a tube across the frame  welded in  in the mid way the should a bracket  looking downward that  were the bobbing fit there should a domed head bolt holding in in place  is only 1/2 inch in diameter and is curved wasted in the middle  for the rubber band to fit in it,  that has much has i can say  yours   anna j  

Re: Rear fastening for slimline fuel tank

Posted by anna jeannette Dixon at February 14. 2017
Previously Chas Goupillot wrote:

Thanks Anna,

That's the information I was looking for, just need to source a bobbin now. That should do away with some of the sharp edges which seem detrimental to the life of a rubber band.

Thanks to all for suggestion for replacement rubber bands.

Best regards,

 

Chas

Hello Sorry I have No photo capabilities As yet   On my computer   I have tried a few things but the computer does not what to upload them    but from the head stock move aft to the rear of the frame  where the oil tank and battery box are situated and there is a tube across the frame  welded in  in the mid way the should a bracket  looking downward that  were the bobbing fit there should a domed head bolt holding in in place  is only 1/2 inch in diameter and is curved wasted in the middle  for the rubber band to fit in it,  that has much has i can say  yours   anna j  

Re: Rear fastening for slimline fuel tank

Posted by David Cooper at February 15. 2017

Thanks for the description, Anna. My 1963 had the two spikes but no  bobbin and as far as  I know there is no bolt hole to carry one. Was this a design change I wonder? The spikes hold the seat so they'd save money by using them for two purposes.

Re: Rear fastening for slimline fuel tank

Posted by terry_odlin at February 15. 2017

HI, all, my 1963 650ss has the 2 prongs on the frame crossmember underneath and at the rear of the fuel tank, pointing rearward, these locate and hold the front of the dual seat in position, fitting into rubber D shaped bobbins that are fitted into metal clips that are part of the underside of the seat base. The 1/4" rubber ring simply fits round the two prongs and over the clip at the rear of the tank.

Hope this helps. Terry

Re: Rear fastening for slimline fuel tank

Posted by anna jeannette Dixon at February 15. 2017

Hello  All well My Norton Manxman 650 is not like this at all  it has centre bobbing  the forward side of the two prongs  on A-shaped bracket  the tank has a centre hook fitting  rear of the tank  2.1/2 gallon tank  two bolts fit in the under- side at the front of the tank  5/16 Whitworth thread  the seat fits more forward than a dominator  one does, in bright red with white piping around the top edge the seat fit up to the two prongs  on its rubbers mounts the rear of the seat has a white Screw knob fitting to hold the rear of the seat in place has I dumped the  silly Dzus fitting  So I have now fitted a nice White Knob  with a 1/4 Whitworth screw fitting plate under side of the rear mudguard , and I fitted a Kawasaki ZZR 600 chrome side stand  by making my own stainless steel brackets  which bolt around the rear engine plates and the bottom frame tube  so it's going nowhere  I was not going to pay out £130  for a Norton side stand    next up I make my own out of stainless steel tube  along with a set of stainless steel engine plates  there easier to clean  and will not rust ,  I do ride my Norton Manxman 650 in the rain at times  so a few improvements will not go a miss                       Yours Anna J 

Re: Rear fastening for slimline fuel tank

Posted by michael_jobson at February 16. 2017

Some interesting theories here regarding the rear tank fixings on a Slimline Dommie. I will assume that the Mercury has a coil mounting like a 1961 Dominator. The two prongs are inserted into rubber bungs that are fitted into two clips welded to the seat base. The prongs are also used to locate the rubber ring that goes over the flat hook on the rear of the tank. So far so good. If the frame rail has a bracket welded to it with a hole through it then the hole is nothing to do with the seat mounting. It is to receive a P clip, which fits between the two small side cheeks on the bracket, that holds the ignition coil. The coil is mounted so that it lays across the frame not fore and aft along the main frame tubes like a Commando. HTH. The Manxman with a small US tank? I have no idea how that lot goes together.

Re: Rear fastening for slimline fuel tank

Posted by malcolm_parker at February 16. 2017

I presented my Atlas for MOT with the tank secured at the back with a Hoover Belt.

The very thorough examiner took hold of the tank, wobbled it, and made a comment about it not being very secure.

Since then I have adopted a (fairly substantial) black plastic-tie, which goes over the tank bracket, round the seat securing prongs, and under the frame bracket. I just cut and replace.

It is very secure.

Re: Rear fastening for slimline fuel tank

Posted by anna jeannette Dixon at February 16. 2017
Previously michael_jobson wrote:

Some interesting theories here regarding the rear tank fixings on a Slimline Dommie. I will assume that the Mercury has a coil mounting like a 1961 Dominator. The two prongs are inserted into rubber bungs that are fitted into two clips welded to the seat base. The prongs are also used to locate the rubber ring that goes over the flat hook on the rear of the tank. So far so good. If the frame rail has a bracket welded to it with a hole through it then the hole is nothing to do with the seat mounting. It is to receive a P clip, which fits between the two small side cheeks on the bracket, that holds the ignition coil. The coil is mounted so that it lays across the frame not fore and aft along the main frame tubes like a Commando. HTH. The Manxman with a small US tank? I have no idea how that lot goes together.

Hello well for a start The Manxman does not have coil ignition the centre bracket is on the small cross tube that's welded in  athart of the frame  this centre bracket looks downward  and is fitted with a round bobbin on one end so the round rubber band fits over it at that end and the other end  fits over a hook bracket on the back of the tank 
 yours anna j

Re: Rear fastening for slimline fuel tank

Posted by michael_jobson at February 17. 2017

I am not going to prolong this discussion beyond this Anna and so this my final contribution, BUT the original question posed to the gathered throng by Chas was related specifically to a Norton Mercury, which I believe IS a coil ignition machine. Hence my reply.

Your comments about the magnificent (tongue in cheek at this point) Manxman are perhaps interesting to some but not at all relevant to the original question. Perhaps if you had answered the question that was actually asked, rather than the one you would prefer to have been asked, then your reply might have some relevance.

Have yourself a nice Nortoning day.

Re: Rear fastening for slimline fuel tank

Posted by Gordon Johnston at February 17. 2017

Interesting MoT experience Malcolm. The whole point of the rubber loop rear mounting is to allow some movement. If the tank is rigidly mounted, vibration fractures will surely follow.

Re: Rear fastening for slimline fuel tank

Posted by Chas Goupillot at February 17. 2017

Hi All,

Thanks to all contributors to what has turned out to be quite a comprehensive thread!

The fittings on my Mercury are pretty much as described by Anna.

I have sourced a nice chrome bobbin from my box-o'-bits and will bolt this to the bracket. This will give me a tidier set-up and the option to use rubber bands or tie-wraps.

For me the original question has been answered, so thanks again for all contributions,

Best regards & ride safe,

Chas

Re: Rear fastening for slimline fuel tank

Posted by Chas Goupillot at February 17. 2017

Hi All,

Thanks to all contributors to what has turned out to be quite a comprehensive thread!

The fittings on my Mercury are pretty much as described by Anna.

I have sourced a nice chrome bobbin from my box-o'-bits and will bolt this to the bracket. This will give me a tidier set-up and the option to use rubber bands or tie-wraps.

For me the original question has been answered, so thanks again for all contributions,

Best regards & ride safe,

Chas

Re: Rear fastening for slimline fuel tank

Posted by alex_arthur at May 26. 2017

Hi, this thread is not current, but as I have been researching the same issue - how the rear of the tank is restrained - in anticipation of commencing rebuild of a currently very non standard 650SS, I thought that the following may be of interest.  Both Roy Bacon's 'Norton Restoration' and the Dominator 'Gold Portfolio' show pictures of the rear tank restraint system, though the pictures are used in other publications too.  One picture is of a deluxe and the other of a standard bike and both can be seen to have a coil mounted on the frame cross member bracket that hangs down at an angle behind the carbs on the bike's centreline.  In both cases a rubber band is mounted around the bracket (apparently before the coil is installed) and up around the back of the cross tube to the bracket on the back of the tank.  The seat locator prongs are definitely not part of the intended restraint. Equally, there is no evidence of a 'bobbin', though I would agree that it would be a neater method of attachment if one could be found to fit.  Scouring the various published factory parts lists for the period gives no hint of a bobbin, and they all call up the same parts for the Dommies in this area. Hope this helps someone in the future...

Re: Rear fastening for slimline fuel tank

Posted by anna jeannette Dixon at May 27. 2017
Previously alex_arthur wrote:

Hi, this thread is not current, but as I have been researching the same issue - how the rear of the tank is restrained - in anticipation of commencing rebuild of a currently very non standard 650SS, I thought that the following may be of interest.  Both Roy Bacon's 'Norton Restoration' and the Dominator 'Gold Portfolio' show pictures of the rear tank restraint system, though the pictures are used in other publications too.  One picture is of a deluxe and the other of a standard bike and both can be seen to have a coil mounted on the frame cross member bracket that hangs down at an angle behind the carbs on the bike's centreline.  In both cases a rubber band is mounted around the bracket (apparently before the coil is installed) and up around the back of the cross tube to the bracket on the back of the tank.  The seat locator prongs are definitely not part of the intended restraint. Equally, there is no evidence of a 'bobbin', though I would agree that it would be a neater method of attachment if one could be found to fit.  Scouring the various published factory parts lists for the period gives no hint of a bobbin, and they all call up the same parts for the Dommies in this area. Hope this helps someone in the future...

Hello well the 650 Manxman has a bobbing shaped for the rubber O-ring to fit nice on to and  Roy Bacon does not have all the  Information  you my need  he reserves his self  to   British market Norton's  when Lots Of Norton's were exported with different fitting to the Home market Norton's  so you not find them in Roy Bacons Books,  For instance, My Manxman 650 has a breather fitting on top of the inlet valve tappet cover  via a special banjo fitting  I do believe  the 650 needs better engine breathing which will help it run better,                 yours   Anna j

Re: Rear fastening for slimline fuel tank

Posted by anna jeannette Dixon at May 27. 2017
Previously alex_arthur wrote:

Hi, this thread is not current, but as I have been researching the same issue - how the rear of the tank is restrained - in anticipation of commencing rebuild of a currently very non standard 650SS, I thought that the following may be of interest.  Both Roy Bacon's 'Norton Restoration' and the Dominator 'Gold Portfolio' show pictures of the rear tank restraint system, though the pictures are used in other publications too.  One picture is of a deluxe and the other of a standard bike and both can be seen to have a coil mounted on the frame cross member bracket that hangs down at an angle behind the carbs on the bike's centreline.  In both cases a rubber band is mounted around the bracket (apparently before the coil is installed) and up around the back of the cross tube to the bracket on the back of the tank.  The seat locator prongs are definitely not part of the intended restraint. Equally, there is no evidence of a 'bobbin', though I would agree that it would be a neater method of attachment if one could be found to fit.  Scouring the various published factory parts lists for the period gives no hint of a bobbin, and they all call up the same parts for the Dommies in this area. Hope this helps someone in the future...

Hello well the 650 Manxman has a bobbing shaped for the rubber O-ring to fit nice on to,  and  Roy Bacon does not have all the  Information  you my need  he reserves his self  to   British market Norton's  when Lots Of Norton's were exported with different fitting to the Home market Norton's  so you not find them in Roy Bacons Books,  For instance, My Manxman 650 has a breather fitting on top of the inlet valve tappet cover  via a special banjo fitting  I do believe  the 650 needs better engine breathing which will help it run better,                 yours   Anna j

Re: Rear fastening for slimline fuel tank

Posted by anna jeannette Dixon at May 27. 2017

Hello, this website posted this twice again !!!  

Re: Rear fastening for slimline fuel tank

Posted by howard_robinson at May 30. 2017

These threads are becoming a mockery.... How does a thread on Mercury tank fastenings become another lesson on how not to upload messages about Manxman folklore ??  I would have gladly paid extra to eliminate this diatribe - as would many members, I'm certain.  Stupidly, morbid curiosity causes me to read the inputs from her.  I can't take it for much longer..........Regards, Howard Robinson

Re: Rear fastening for slimline fuel tank

Posted by Gordon Johnston at May 30. 2017

You actually read them? Masochism indeed.

Re: Rear fastening for slimline fuel tank

Posted by david_draper at May 30. 2017

My 650SS, which I have owned since 1964, only ever had a rubber band like a Hoover drive belt that fitted over the bracket that points downward and over the hook on the tank. I suspect the bracket is there to carry the ignition coil on bikes that don't have a mag. There is no bobbin (please note the spelling).

On a similar front, can nobody punctuate these days? In 95% of cases, adding just an s to the end of a noun makes that noun plaural. Please note, no apostophe. 's at the end of a noun denotes posession . (eg Dave's Norton Dominator.)

My word, I feel better after that little rant.

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