The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => Frame => Topic started by: Peter Gee on 18.09. 2018 06:21
-
I wonder what this thing is for. And it has slots, spacers, various types of fancy washers...when all it does is tie two sides of the tank together? I count 11 parts to the "assembly" in the list. Why the spacers? Spacing what?
Is this necessary on a 59 A7SS and if so, why?
Thanks
-
I think maybe stops the seams vibrating apart- you can leave them out and see how long the tank lasts, then you be able to let everyone know *dunno*
-
Any tank with a deep saddle will suffer vibration and fatigue, especially if you hit a resonant frequency. BSA and Velocette tank splits are often a result of leaving off the bridge piece.
-
BSA wouldn't have wasted money fitting it if the bike didn't need it. OIFs were another range of bikes that riders used to ask the same question or couldn't be arsed to replace it, and then found out the hard way when the (tricky to repair) tunnel fractures started to appear..
-
Is as it states, a "Tank STIFFENER", tank will split with full loads of fuel going over bumps, gutters etc.
Easy to bolt back on and let it do its job, It wont gain you anything leaving it off and cost you nothing to put it on
-
Uh, I don't know about everybody else, but I can't see what Peter's holding up. I think the spacers may be to adjust the standoff distance of the stiffener from the tank. This may be necessary for the stiffener to work its way through or under the tank bumper dangle-down (what else would you call it?) based on the exact vertical position of the tank. My stiffener passes through the lower hole of the dangle-down.
(You should have thought of at least three jokes by now.)
Richard L.
-
Well it depends.
If you suffer from crutch lice leave it off, apparently petrol soaked undies does wonders for this condition.
-
G'day Peter.
Don't leave home without it. Years back I was testing a bike with a short ride around the block. Saved about 2 minutes by leaving it off. Yep the tank started leaking.
Cheers.
-
I read Pete's post and immediately took action!
-
I read Pete's post and immediately took action!
I hope that is not a metric spanner!
I lost the strap for my tank so I just cut a piece of mild steel strip and drilled a couple of holes in the ends.
-
its not metric anymore...
-
Hi Guy,
Looking at the photo you posted it looks like the tank buffer rubbers are missing *????* *????*
these fit into the gadget with the round holes above the tank strap
John
-
Am i the only one who has done lots of miles with never a strap? Have fitted an Indian tank (gulp) and am now nervous. Looks like I'll be being creative next time i get the tank off. I suppose a massive,superstrong elastic band is not suitable?(joke)
-
Jim, you maybe don't even need to remove the tank
-
Spend enough time on my knees praying to the god of BSA, Will be happier with it empty and up on a bench.
-
Am i the only one who has done lots of miles with never a strap? Have fitted an Indian tank (gulp) and am now nervous. Looks like I'll be being creative next time i get the tank off. I suppose a massive,superstrong elastic band is not suitable?(joke)
Hi Jamie
I have an Indian tank and the PO never fitted the strap - although he never rode it after restoring it. The first one to ride it on the road was me and I soon noticed a serious vibration (rattle) from the tank especially when full.
There were no rubber buffers fitted either.
The problem with my Indian tank was that the tunnel was wider than standard so the buffers were not long enough and did not secure the tank. I also found after ordering a new tank strap that the studs were further apart than standard so I made a new strap to suit.
That improved matters but it was still not right.
I ended up by padding out the frame tube by using a couple of pieces of 2 1/2" radiator hose split along its length and taped on. Also a piece of foam rubber taped over the rubber buffers.
It seems to have done the trick and there is no loud vibration at about 2500 - 3000 RPM.
I would definitely not use your bike without the strap of the tank will split in no time flat.
Jim
-
Hi Guy,
Looking at the photo you posted it looks like the tank buffer rubbers are missing *????* *????*
these fit into the gadget with the round holes above the tank strap
John
Hi Guy,
Looking at the photo you posted it looks like the tank buffer rubbers are missing *????* *????*
these fit into the gadget with the round holes above the tank strap
John
There are couple of tank rubbers just above the thing your describing, although I see you point. My tank doesn't vibrate when riding..as far as I can tell anyway. I'll take a picture next time I take the tank off and show you what's there...
Guy
-
G'day BJ.
I made one from 1" x 1/4" alloy (I luv alloy) and slotted the holes so I only need to loosen the nuts. Does that tell you how often I have the tank off *ex*
Cheers
-
I made one from 1" x 1/4" alloy (I luv alloy) and slotted the holes so I only need to loosen the nuts.
You beauty! I'm nicking that idea.
-
Hi Jim(lawnmowerman). Yes to copious amounts of padding under and to the side of Indian tank which is looser than original on mine but not by much. Have never had a problem with vibration though, my tank feels nicely isolated from engine vibe. I managed to get some tough plasticated foam(?) sheet from a building site years ago. This was used in the expansion joints of huge concrete slabs and has been used on many places on the bike. I will fit a strap at some point, like the idea of Muskrats slot.
*conf2* *bright idea* *good3*
-
...like the idea of Muskrats slot.
Steady on!
-
Am blushing!
Thank you for making me laugh out loud!
*dribble* *yeah* *beer*
-
Its that silly centre bolt fastening that causes the issue. Why the hell the design brains at BSA didnt simply locate the tank on the two rubber buffers at the front and tie it down at the back with an elastic strap like the Italian bikes do has got me guessing.