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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #11  
Old 4 Days Ago
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Originally Posted by John Harper View Post
Doesn't that clear line get stiff and discolored? My buddy got some for his dirt bike and it got stiff and brown within weeks and was leaking from the carb connection. I just use 1/4" regular black fuel line on my bike. Maybe tygon is different?

John
Are you sure it was Tygon he used? I've seen people use vinyl tubing thinking it's the same thing and that crap hardens within weeks, as you've said. Mine have lasted years and have remained flexible. Tygon feels more like surgical tubing if anything... although surgical tubing isn't fuel safe, AFAIK.
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  #12  
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Originally Posted by Diogenes415 View Post
Are you sure it was Tygon he used? I've seen people use vinyl tubing thinking it's the same thing and that crap hardens within weeks, as you've said. Mine have lasted years and have remained flexible. Tygon feels more like surgical tubing if anything... although surgical tubing isn't fuel safe, AFAIK.
Ok, I'll look into it.

John
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Originally Posted by John Harper View Post
Ok, I'll look into it.

John
It's sold in black, grey, clear and yellow translucent, maybe even more colors nowadays. I've been working off of the same 50' roll I bought over 20 years ago.

Tygon fuel line at Summit Racing.
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What ever you use i would put it inside a length of armaflex tubing to protect it from the heat of the heads/barrels. And as already suggested, go to a car accessory shop, Harley prices are crazy for these items.
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Thanks all

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My buddy bought a foot of grey 1/4" fuel line for his two 2007 Yamaha XT 225s. I think it is probably Tygon. I changed both bikes lines plus small inline filters. One bike had some 3/16" line from my scrap box, and the other, the blue line we tried previously. It leaked on the other bike so I used 3/16" line. That issue is still a problem with the Tygon. Yamaha says it should be 1/4" ID line to be used. Identical bikes.

Seems to fit a bit looser than I would like (1/4" fittings) compared to my regular 1/4" line, and one of his petcock fittings seems a bit smaller than the other (and leaked again!), so I had to go back to some old 3/16" line from petcock to his inline filter. I'm not sure he's got the right clamps, either. Maybe we can find a bit smaller diameter on Ebay.

He paid $6 for a foot of this stuff. I think my regular black fuel line still works for me.

John
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The main issue with Tygon for me is that it is not particularly heat resistant even the LP110 speced for fuel lines. Similarly with "black rubber hoses,"
Some are much better at handling ethanol and heat than others. It is best to check the SAE spec to be be sure before installing it between Harley cylinders.
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