SOHC.co.uk Forums > CB500/550

Hanging Idle and poor throttle response.

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Sesman:
All. I think the difficulty getting a wire through is due to the significant step in the drilling. The step is present on both sides of the jet. The .38 or .4mm drilling is very short relative to the length of the jet (28mm).

Iv’e now inspected several old original, new original and new pattern pilot jets and arrived at the same conclusion….it’s a drilling only. I’m not convinced any kind of engineering intervention within the jet is required to effect correct running…..I’ve proven this empirically.  Unless somebody can demonstrate it’s possible to pass a .3mm wire past the mythical spider in a .38mm jet it doesn’t exist. In my mind at least.

Show me the spiders web….

My visual observations to date have simply observed the refractive effects at the internal drilling step. Try viewing the end again with a wire inserted….you will see what I mean.

Laverdaroo:
Ka Pow!

I'm in no position to question on things I know nowt about but I've found this really interesting from the off. In my addled head I couldnt fathom the manufacturing process involved in the making of the jet to allow the web to be present. It simply didnt compute for Honda to manufacture such a fiddly scenario, no mtter what technology they held at the time. I'm not sure you could do it now tbh, happy to be enlightened though.
At the end of the day, this has been a really good use of brain cells to conclude an issue/topic/myth or however you want to lable it. This is what the forum's for and just emphesises what a great thing it is to be involved in.


Disclaimer: I dont get any form of commission from SOHC and not a 'crawly bum lick' either, just highlighting what we already know ;);D

Bryanj:
Wasnt Honda that made them, they bought in carbs from Keihn who made for lots of manufacturers

philward:
Just read this whole thread and with my none Honda engineering background, my logic says this debate hinges around how the spidery web structure could be manufactured - if it could, then there can then be a debate as to its use - if that structure could not be engineered, then the discussion ends? Original post where the bike runs well after clean out seems to be the proof of the pudding in the absence of this?

Sent from my moto g(50) using Tapatalk

Sesman:
Incidentally, to close this out. I replaced all four pilot jets with new replacements…..it didn’t change a thing and the bike performs just like it did after the clean…..perfectly. I can now go on to check sync the vacuum, but to be fair it seems fine. It might quiet the clutch down a little, but as it’s a 500 I’m doubtful.

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