My Cool 750 Commando

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My Cool 750 Commando
 
hobot, isn't duck plucking a one-way street? (thranslation - isn't the duck bill a one-way valve, whereas Needing requested a 2-way valve?)
 
needing said:
Frame tube fuel tank two-way vent valve criteria:
1a. Must allow air to escape when frame tube is filling from below, but
1b. Must not allow fuel surge to escape under heavy braking, and
2. Must allow air to enter as fuel is consumed from the frame tube, and
3. Must seal the fuel from escaping if, omnipresent hail Norton save us and protect us 'being' forbid, my bike is ever on its side on the ground, and
4. Small and compact enough to fit in the LH cup holder where the speedo went.
Click to expand...
Would you be willing to weld two small bungs to the inside tunnel of your tank; one up by the steering head, and one somewhere at the back, accessible near the petcocks? If so, you could have a vent line at the top of the frame connected to the new bung via a short piece of rubber line, then do the same at the back of the frame and tank. Using my x-ray vision, I can see that, with the backbone sloped, it would find its level at the same as the tank, thus giving you the added volume without any valving and/or open, slit tubing.

My Cool 750 Commando


There's no concern about having the top fitting being above the "water line" at any time, since, even if it's underneath fuel during a full-tank scenerio, it'd still function to let the backbone find its own level.

Nathan
 
I cam imagine Comnoz talking about this thread at his New Year celebration..............
My Cool 750 Commando
 
41°C on the Saturday and I needed to fit a fancy LED globe so emptied the headlight shell and stuffed the bits and gauge module (not shown) into a 'black' box.

My Cool 750 Commando
 
Purchase complete.
Engineering machine shop not required.
Shop bought part (65-3823) to improve Norton Commando clutch centre retention efficacy.
Force is applied to a wider area of the clutch centre than the original nut options.
This pressure reduces rocking on main shaft that the original nut options permit.
Enjoy.
 
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