DT 250/400 tank

Leslie

Leslie

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Hi I am fitting a 76 DT 250/400 tank to my tracker, The tunnel of the tank is too narrow, has anyone got around this problem, as i have seen plenty on the forums with the DT tank conversion, I thought about spreading the tank, but the fear of creasing the steel is putting me off.
 

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As far as I know, it requires major surgery: cutting out, widening and re-welding the tunnel. That's the only thing that stopped me from doing it as I think the result is GORGEOUS!
 
Downeaster said:
As far as I know, it requires major surgery: cutting out, widening and re-welding the tunnel. That's the only thing that stopped me from doing it as I think the result is GORGEOUS!
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Downeaster you are correct, the tank is with my local fabricator, he is cutting and i will try it before it is welded up and painted. I will only be riding it in the summer with short trips into Derbyshire & Lincolnshire.
 
Would the tunnel fit over the backbone if the cup mounting style wasn’t on the tank or frame? Thinking along the lines of mounting tabs welded on the tank to bolt to top of the backbone perhaps.
 
Leslie said:
Downeaster you are correct, the tank is with my local fabricator, he is cutting and i will try it before it is welded up and painted. I will only be riding it in the summer with short trips into Derbyshire & Lincolnshire.
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I expect it will be short trips. My DT400 used to run onto reserve before 60 miles. Mind you, that was a thirsty stinkwheel and petrol was cheap in the '70s.

And your tank will have a reduced volume; will look luvverly but bike will be a bit of a forecourt Queen?
 
willis said:
Would the tunnel fit over the backbone if the cup mounting style wasn’t on the tank or frame? Thinking along the lines of mounting tabs welded on the tank to bolt to top of the backbone perhaps.
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Willis I have had to cut the tank, 12mm/1/2" app each side of the bottom of the tank, also I am going to have to get a smaller petcock
 

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it fits perfect now and the position doesn't effect the steering, just the DT petrol tap is too long, I will be looking for a shorter petcock.
 

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British bikes often have smaller, simpler taps. I bought a petcock for the RE Bullet from Feked - and they have a few styles.
 
Raymond said:
I expect it will be short trips. My DT400 used to run onto reserve before 60 miles. Mind you, that was a thirsty stinkwheel and petrol was cheap in the '70s.

And your tank will have a reduced volume; will look luvverly but bike will be a bit of a forecourt Queen?
Click to expand...
Raymond I live central to several bike meets, plus Donnington Cadwell & Mallory, not to mention Matlock possibly the best bike meet in the UK.
 

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