SOHC.co.uk Forums > CB500/550
Judge my CB550F2 1977 idling
McCabe-Thiele (Ted):
--- Quote from: alexdecker on August 09, 2026, 05:21:49 PM ---This is the direct link to the boots!
https://www.ebay.de/itm/361837356740
--- End quote ---
Ok so have you checked old against new,
Oddjob:
Any chance you fitted them back to front? Easy done
alexdecker:
I've used the right boots for the intake. They are easy to differentiate, as they have the lips that go into the airbox. Unfortunately I can't measure them up against the old ones, as I chucked them when the new ones was installed in a pre-mature celebratory moment of relief of finally having done this task, as un- and reinstalling the carbs is such a pita! 🙁
Oddjob:
Forgot to mention, the inner 2 are sort of handed. The originals have a small tab which sticks out of the part that goes into the plenum chamber. These fit between 2 bumps on the chamber, it's to ensure you get the correct orientation. They face inwards towards each other. Plus you can remove the boots in situ. Just unbolt the airbox and slide in backwards. You can then refit them with a little difficulty but it is doable.
alexdecker:
Okay, this story is slowly unfolding to a grim nightmare. Got the boots fixed on all 4 intakes and exhausts, but now 2 & 3 are not firing at all.
Here is what I have done so far:
* When I had the carburetor out, I cleaned it, before putting it in with new boots (just carb cleaner, but had the top lid off and the float bowls)
* I replaced the points with new original Honda points
* I then set cam chain, valves (kept them to the looser side of around 0,08 mm intake and 0.1 mm exhaust). I then set timing.
Measured the coils and they measure a 3.2 ohm resistance each. The points are getting power. The timing is dead on. I got spark on all the plugs.
What on earth could cause 2 & 3 to just set out all of a sudden?
- Alex
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