What year tank is this? - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 6 (permalink) Old 11-30-2012, 07:56 PM Thread Starter
Grand Prix 125
Main Motorcycle: t140
Join Date: Sep 2012
Location: belleville
Posts: 30
What year tank is this?

Im working on a '76 OIF bike. I bought a tank mount kit in pic.
I thought when I would tighten the nut the rubber cone would expand and hold the tank, but it doesnt.
So either Im doing something wrong, or I have the wrong parts for the wrong tank. there are no holes in the bottom of tank.

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post #2 of 6 (permalink) Old 11-30-2012, 08:46 PM
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Main Motorcycle: Triumph TR7
Join Date: Feb 2012
Location: Norwich, England
Posts: 4,174
Other Motorcycle: T140
Extra Motorcycle: Most of another T140
Hmmm, looks like you've got an earlier tank. The 1976 tank did not have a seam along the centre - I'm npot sure when these were phased out but I think around 1972. The fastening kit you've got looks right. Problem is, the tank you're using seems not to have any flange at the bottom of the mounting hole/tube. This is basically a washer welded into the bottom of the tube, onto which the rubber part crushes and expands when the nut is screwed down. You could use this tank if you want (as long as it fits in every other respect, which I imagine it will), as long as you get a washer welded in the right place to make the fitting method work.
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post #3 of 6 (permalink) Old 11-30-2012, 09:39 PM Thread Starter
Grand Prix 125
Main Motorcycle: t140
Join Date: Sep 2012
Location: belleville
Posts: 30
Thanks John, that sounds like an eazy solution.
Actually the bike is titled as a 73, but it has disk brakes and a 5 speed.
So it looks like I have a mix of various models.
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post #4 of 6 (permalink) Old 11-30-2012, 09:55 PM
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Main Motorcycle: 72 Bonneville T120RV
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Join Date: Aug 2010
Location: Canada
Posts: 10,937
The tank mounting kit for your tank is different. That one you posted is for a T140. The beading holder for a T120 is on the top of the tank part number 83-13318 not on the bottom like the T140's. Yours is a T120 tank. Tri Cor England should have the parts you need. Get the original part numbers from the parts book here (1972) http://classicbike.biz/ and convert to new numbers if you can't find the complete kit. Or try British Only.

Last edited by triumpt120rv; 11-30-2012 at 09:58 PM.
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post #5 of 6 (permalink) Old 11-30-2012, 10:13 PM Thread Starter
Grand Prix 125
Main Motorcycle: t140
Join Date: Sep 2012
Location: belleville
Posts: 30
yep thats the tank, thanks rv.
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post #6 of 6 (permalink) Old 12-01-2012, 08:04 AM
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Grand Prix 500
Main Motorcycle: Triumph TR7V
Join Date: Oct 2008
Location: Newbury, UK
Posts: 134
Other Motorcycle: BSA B40 SS90
This is fitting you require for the tank.
I have the same tank fitted to my 1977 TR7 without any problems. I have used the T140 fittings shown in your picture but have added a spacer, washer and nut to hold the bolt in place and ensure the rubber expands in the tank tube - seems to work fine and stops the bolt spinning round.
I did not fit the original as I could not get hold of any of the chrome covers for the central seam at the time and it looks odd without them.
This tank does have the advantage of a reasonable fuel capacity whilst still retaining the US spec look.
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