SOHC.co.uk Forums > CB500/550
CB550 Tuning Advice
McCabe-Thiele (Ted):
--- Quote from: florence on October 15, 2026, 01:00:56 PM ---
I would rather find a UV and Ethanol resilient hose.
--- End quote ---
I used 303 Aerospace Protector Spray to stop uV degradation of a Hot Tub Vinyl Cover when we had one. It worked well. Used it for 10 years, it does not dry it acts as an effective barrier. Not cheap, lasts ages, effective.
You could just spray the hose where it's exposed to light.
Sesman:
NeilW.
Just for clarity, you tried two suppliers: Honda classics and planet silicon, receiving the same unsuitable product?
Neilw:
--- Quote from: Sesman on October 15, 2026, 04:01:55 PM ---NeilW.
Just for clarity, you tried two suppliers: Honda classics and Planet Silicon, receiving the same unsuitable product?
--- End quote ---
Yes, the same; they look identical. I'm just not prepared to take the chance; when the new one arrives, I'll cut the existing ones up to see where the issue is. It could also be the little 3.5/7.5 hoses that connect 2 carbs together (I got these from Planet Silicon too). I definitely need to see which hose(s) are responsible.
I should say that I haven't tried the Honda Classics one; I'm too scared!
Oddjob:
It won't be the connecting tubes, they move air only unless the bike goes over. They are just there to ensure equal pressures in the float chambers.
This is what I found on EBay. Viton lined.
https://www.ebay.co.uk/itm/260815755996?_trkparms=amclksrc%3DITM%26aid%3D777008%26algo%3DPERSONAL.TOPIC%26ao%3D1%26asc%3D20250417133222%26meid%3D31ec5560b8bf43c8aaee0c7a4ec92eb4%26pid%3D102727%26rk%3D1%26rkt%3D1%26mehot%3Dnone%26itm%3D260815755996%26pmt%3D1%26noa%3D1%26pg%3D4375194%26algv%3DWatchlistVariantWithPSItemDR_BP&_trksid=p4375194.c102727.m162921
Neilw:
--- Quote from: Oddjob on October 15, 2026, 04:44:08 PM ---It won't be the connecting tubes, they move air only unless the bike goes over. They are just there to ensure equal pressures in the float chambers.
This is what I found on EBay. Viton lined.
https://www.ebay.co.uk/itm/260815755996?_trkparms=amclksrc%3DITM%26aid%3D777008%26algo%3DPERSONAL.TOPIC%26ao%3D1%26asc%3D20250417133222%26meid%3D31ec5560b8bf43c8aaee0c7a4ec92eb4%26pid%3D102727%26rk%3D1%26rkt%3D1%26mehot%3Dnone%26itm%3D260815755996%26pmt%3D1%26noa%3D1%26pg%3D4375194%26algv%3DWatchlistVariantWithPSItemDR_BP&_trksid=p4375194.c102727.m162921
--- End quote ---
Looks like the same as i have ordered, mine was a bit cheaper - but same stuff.
Good to know about the connecting tubes. Thank you.
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