SOHC.co.uk Forums > CB500/550

Refurbing Carbs - In what condition should you replace the jets

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Neilw:
I'm tearing down the carbs of my 1978 CB550 F2, i've already cracked one of the Float bowls trying to get the drain screw out and lost a spring, which NurseJulie has very kindly donated a replacement.

I intended to clean everything, which I can see is going to take some time using Carb Cleaner.

I was going to keep all the jets, clean them, and replace the rubbers, etc. Most of the jets are in a state, and will need carb cleaner and something abrasive, like steel wool, to clean them. They most typically look like the example in the picture.

Are these too far gone, and should I go for a rebuild kit? Or should I persevere?

Orcade-Ian:
Perceived wisdom is that the originals (they look like they could easily be) are far better than some of cheap replacements, so better to keep those.  I would not use wire wool but a good soaking in a small jar with carb cleaner in (even brake cleaner works well) might get most of the gunge off.  A light rub over the external surfaces with a grey scotchbrite pad, should have them clean again.  You can keep checking to see if all holes are clear and keep going if not.  If you know anyone with an ultrasonic cleaning bath (jewellers, dentists 🙈) they might help you. 

Ian

Bryanj:
Or buy an ultrasonic cleaner that 1 carb fits into, your carbs are relatively easy to de rack and reassemble unlike the PD ones

Oddjob:
Go to a main supermarket and the dental hygiene section. Buy an assortment of Interdental brushes. Use these to clean out the jets along with some carb cleaner. The bristles are nylon and will cause no damage.

Skoti:
Once cleaned test if the carb needles will pass straight through the needle jets unobstructed, if so the jets and needles are worn and you'll be better renewing them.

https://www.cmsnl.com/honda-cb550f2-super-sport-550-four-1977-england_model17121/needle-setjet_16012390004/


I've found the other jets don't normally wear much, unless someone's had a go at cleaning them out with abrasive wire etc.

Also agree that genuine Honda jets are the only way to go if available.


Good luck

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