Fuel Line Options Dual Amals

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swooshdave

swooshdave

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Fuel Line Options Dual Amals

This the pre-MkIII assembly. Seems like a lot of parts. I think, from what I can tell, not many bikes still use this contraption.

Fuel Line Options Dual Amals

I have the T fittings and could make it that way.

Fuel Line Options Dual Amals

This is the MkIII assembly. That is how I first mockup up my carbs, except I think I have Triumph banjos, which may have an angle instead of 180º fittings.

Fuel Line Options Dual Amals


Which fuel lines are you using?
 
swooshdave The H type is the one that cam on my 74 when I bought it in 75 It will have a new one when Im done rebuilding it Phil
 
Mine has the original 'H' set-up. Yellowed and brittle as hell. Can't believe DPO never replaced it. Well it was sitting for thirty years so that may explain why.

Will be using the latter type configuration.....when I finally get to the carbs!
 
Blimey, didn't know you could buy them made up. I use black fuel hose, looks neat. Use the latter configuration, but did originally have the H type.
 
Anglophile said:
Mine has the original 'H' set-up. Yellowed and brittle as hell. Can't believe DPO never replaced it. Well it was sitting for thirty years so that may explain why.

Will be using the latter type configuration.....when I finally get to the carbs!
Click to expand...

I literally had to cut the old lines apart using a Dremel.

Fuel Line Options Dual Amals
 
Norton-Villier said:
Dave Did you try a heat gun Im going to try it on my old one Phil
Click to expand...

I was afraid of melting the plastic fittings. I ground away the old hose very, very carefully and when it was almost through I pried it the rest of the way off.
 
The 750 models used the 'H' set-up with plastic 'Tees'. This was changed to the double banjo for the 850's, I believe in '74. The problem with the 'H' set up is the cross over is quite close to the back of the cylinder.

I make up my fuel lines with polyurethane tubing. This tubing discolors as badly as the old vinyl, but it does not get hard and brittle. I also try to use metal 'T's and metal banjo's when I can find them. The old style monobloc carb banjos were usually metal, but sometimes need to be drilled out to fit the concentrics.
 
The closeness to the cylinder is only an issue if a head gasket blows out at it weak spot where the oil drain hole is, then jets of combusting gas directly hits the fuel line and will cut it to spill flame in about 30 sec. I remembered this about 15 sec into Trixie Combat's blow out and a few more to get stopped with just seconds to spare. Replaced back gasket and repaired clear factory fuel hose by silicon and heat shrink as still held fuel. New clear hose kit by factory number goes on this season.

hobot
 
Hi Dave
I think Ron is right that the change was due to the possibility that a blown head gasket might heat things up enough to cause some unwelcome fireworks outside of what goes on in the engine at the 28 degree spark BTDC.
Don't Quote me but I think IMHO this was the reason.
May be more knowledgeable folks confirming this???
CNN
 
Ron L said:
I make up my fuel lines with polyurethane tubing. This tubing discolors as badly as the old vinyl, but it does not get hard and brittle.
Click to expand...

On my Bultacos I've used Tygon, great stuff, won't harden and is translucent so you can see the fuel.

Fuel Line Options Dual Amals


Wakula Racing Tygon

With the banjos I have I don't think I can do the newer style setup. I might try the H style until I can find the right banjos.
 
L.A.B. said:
swooshdave said:
With the banjos I have I don't think I can do the newer style setup. I might try the H style until I can find the right banjos.
Click to expand...

Yes, the 150°double banjos are for Triumphs.

The 180°double banjo for 1/4" pipe is Amal part 376/419
Fuel Line Options Dual Amals


http://www.amalcarb.co.uk/default.aspx
Click to expand...
Before I bastardized my bike with the Mikuni TM, I liked the way the 150's tucked in and pointed to the petcocks, and the 5/16" pipe. 376/139
 
I was fortunate to have an A-N new asembly in a box of bits which came with mine - fitted perfectly and hasn't gone brittle or opaque in over 2 months of hard use ;)

Fuel Line Options Dual Amals
 
I'm still dismayed by the costs of the fuel line assemblies but those fittings are more expensive than you would think. The banjos are about $10ea from Amal and the ones that go to the petcocks have to be at least that much. There's $40 right there before hose and crimping. No wonder they are $50+ for the whole thing.
 
Mine had metal T's, plastic carb fittings and metal tap fittings. I cut the brass clamps off with a pair of side cutters, cut the line with a utility knife and pulled the fittings off. I guess I'll set mine up as the original H for now.

Fuel Line Options Dual Amals


Dave
69S
 
Dave,

I was lucky to have the original bango's and fuel tap fittings, I just bought the thick clear tubing and crimp ferrules from my local brit bike shop. And made the latter style set up like you displayed. You can crimp the ferrules nicely, by cuting the appropriate sized nut in half and puting in a vice to make the crimp, with the two little swagged bits. Done carefully looks just right and tube and 6 ferrules was not that expensive.

Cheers Richard
 
stockie1 said:
Dave,

I was lucky to have the original bango's and fuel tap fittings, I just bought the thick clear tubing and crimp ferrules from my local brit bike shop. And made the latter style set up like you displayed. You can crimp the ferrules nicely, by cuting the appropriate sized nut in half and puting in a vice to make the crimp, with the two little swagged bits. Done carefully looks just right and tube and 6 ferrules was not that expensive.

Cheers Richard
Click to expand...

Good tips!
 
I used the RGM complete clear set on my Amals and they fit perfectly.Part# 065192, even with overseas shipping they were the cheapest.
 
speirmoor said:
I used the RGM complete clear set on my Amals and they fit perfectly.Part# 065192, even with overseas shipping they were the cheapest.
Click to expand...

Wow, $31. Anyone know what fuel line they use?
 
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