SOHC.co.uk Forums > CB500/550
CB550 Tuning Advice
Neilw:
--- Quote from: Sesman on October 14, 2026, 11:35:58 AM ---Mmm. So I sourced some hose from Honda Classics and it’s arrived very promptly. It’s marked AFS NT 006 DIN 73379 Type C1 NBR. If I’m not mistaken this is a nitrile specification. I appreciate not all specifications are equal, but it will be interesting to see if this is any more resilient to deterioration than the shite I purchased from another supplier.
Here goes nothing, but I can’t help thinking a viton specification tube will remove all doubt regarding hose break down creating crumb deposits in the fuel line.
--- End quote ---
I've purchased the same stuff, based on the description on the website which states
"Fuel Line Tube Pipe of 5.5mm Bore (10mm outer diameter) for this model and many others with 5.5mm bore fuel line fitting. This tube is the latest Ethanol Resistant rubber material suitable for all types of E5/E10 fuel. "
Hmmm if it says "DIN 73379 Type C1" on it, then according to Chat GBT it's not going to be good enough.
Recommends - FKM / Viton (or DIN 73379 Type E) Highly Recommended. FKM is fully immune to ethanol degradation and outlasts NBR by decades.
Or
DIN 73379 Type 2E or 3E (if using NBR) If you stick to NBR, ensure it is rated for E10/E85 fuels (bio-fuel resistant). Standard older C1 NBR will fail.
Oddjob:
I looked it up.
AFS NT 006 DIN 73379 Type C1 NBR fuel hose is not highly ethanol-resistant. While it is rated as compatible with standard commercial unleaded petrol containing up to 10% ethanol (E10), it is not suitable for high-ethanol blends like E85 or E100.
So seems to be OK ish with todays fuel BUT maybe not so much with any future fuel as there are rumours the ethanol content will be increased in line with the rest of the world, namely America where I believe it's much higher. They do seem to making it out to be viton in their description, what else would you think?
Neilw:
--- Quote from: Sesman on October 14, 2026, 11:35:58 AM ---Mmm. So I sourced some hose from Honda Classics and it’s arrived very promptly. It’s marked AFS NT 006 DIN 73379 Type C1 NBR. If I’m not mistaken this is a nitrile specification. I appreciate not all specifications are equal, but it will be interesting to see if this is any more resilient to deterioration than the shite I purchased from another supplier.
Here goes nothing, but I can’t help thinking a viton specification tube will remove all doubt regarding hose break down creating crumb deposits in the fuel line.
--- End quote ---
I've just received mine and its marked up the same. It's exactly the same tube i was using that has shed into the carbs, right down to the lettering. i'm going to send mine back and try to find something that guarantees it's safe and won't shed. Modern bikes must use something
Oddjob:
If you can find some marked DIN 73379 Type 3E that’s lined with FKM which is viton and 100% ethanol resistant.
McCabe-Thiele (Ted):
Gates Barricade petrol pipe is ethanol resistant to E85.
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