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1978 Honda CB550 Supersport - My first retro bike rolling restoration!
woody928:
Thanks Ken, very helpful as ever.
Julie has saved the day for the second time now :)
The fuel line sizing seems confusing as ever I already had some 5.5mm and 3.2mm here and the 5.5mm is perfect for the fuel hose from the Petcock lines however the connecting hose between carbs 1-2 and 3-4 is clearly a smaller diameter, the 3.2mm fits but is way too tight and the 5.5mm is too loose. I've ordered some 4mm now as well as it is what the old stuff appears to measure at and I think would be more appropriate. I'm keeping my fingers crossed.
Understandable on the BZP finish, I'm very aware that no meaningful cleaning will be possible as soon as these are reassembled and fitted back up. I'm not to fussed though, at the end of the day, all of my toys are there to be used, not to win show and shine competitions ;)
--- Quote from: K2-K6 on June 15, 2020, 07:35:49 PM ---Yes as you describe, the o-ring keeps them in place and prevents any unmetered fuel from bypassing the jet orifice. The burr area is ordinarily not touching much so plays no real part in their accuracy unless so severely impaired they'd not locate perpendicular to the casting.
If you struggle for any particular stainless bolts, AHC on the old A30 in Camberley will usually hold stock of most items individually. You can park in the road adjacent to there as it's restricted out front of shop.
--- End quote ---
Thanks for confirming, I've had a further inspection this evening and this is the only jet showing damage thankfully. Frustratingly someone really has previously battered it though, however it doesn't look like it will effect how it seats. I think with new seals fitted it should fit back up ok and seal however I'd welcome any further input?
Pictures below showing the worst of it:
IMG_8151 by Mark Woodrow, on Flickr
IMG_8152 by Mark Woodrow, on Flickr
Thanks for the heads up, that's much appreciated. I've gone for one of these Mega Packs from Mr Megapack so will post up what turns up later this week all being well.
--- Quote from: Rob62 on June 16, 2020, 09:33:32 AM ---Proper job cornish IPA aldi special......my current tipple of choice 8)
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Hahaha its not bad for the sunny weather we've had of late 8) Certainly not a session beer though!
--- Quote from: sye on June 16, 2020, 12:47:08 PM ---Take a look here for #98 main jet:
https://www.dimecitycycles.com/vintage-cafe-racer-caferacer-bobber-brat-chopper-custom-motorcycle-carburetor-parts-keihin-cv-secondary-jet-98-026-051.html
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Thanks, that's much appreciated. I was hoping for a UK supplier though as I want these put back together this weekend all being well. The US seems to have all the good stuff, just like when I'm looking for parts for my 240z ::)
woody928:
Ahh my mistake and ignorance showing through, I was referring to the air vent pipes that connect in-between the carbs. I'm assuming that should be 3.5mm pipe then? Typically I have 3.2mm pipe already and will soon have 4mm pipe as well.
As long as it's not going to have any operational impact then that will have to do for now. I would imagine that ordering a replacement set from the US at a later date to replace all of them so that they are matching would be the solution. It could be that I rejet later with an exhaust change anyway.
s7paul:
I've just bought some hose to replace my old split and age-hardened original engine breather. Finding that the OEM item is discontinued, I got some of this:
https://www.carbuilder.com/uk/low-pressure-fuel-vent-drain-hose-10mm-id
Fits perfectly, and is a bit more flexible than the original.
motty:
By all means use that jet "for now" but I would be purchasing one to have in the spares box ready for the next time the carbs come apart
Sent from my Moto E (4) Plus using Tapatalk
K2-K6:
--- Quote from: motty on June 18, 2020, 08:40:13 AM ---By all means use that jet "for now" but I would be purchasing one to have in the spares box ready for the next time the carbs come apart
Sent from my Moto E (4) Plus using Tapatalk
--- End quote ---
I'd like to support the contra view, in that the jet is really just cosmetically damaged and dressed off with a file will perform as original. The seal and bore being the critical performance elements.
As it's part of the original set ( more of us are holding the view that original brass in good condition is hard to match with replacements) and these running best with accurate fuel metering, I feel it's advantageous to keep an original.
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