SOHC.co.uk Forums > CB500/550
500 carbs what does what question.
McCabe-Thiele (Ted):
They are pattern ones he sells as no Honda ones were listed- as the poor running on number one cylinder has so far been from idling is it not a bit early to suspect the DS parts?
I have also noticed the outside of plug 1 had corrosion through the outer plating so can't be certain that it's not a plug issue as well. The bike was running rich when I did my pre strip down ride with no tick over when warm unless the screw was turned up causing the hanging idle issue. I did not want to put my new plugs in only to blacken them straight away.
McCabe-Thiele (Ted):
I had a chat with Ken today to gain another perspective on my carb running issues - the first thing he asked me is to confirm what the type number of my carbs were. Ken told me where to look on the right side of the main body for the type number on the main casting.
It turns out that my carbs are 069A - all four of them - apparently they were for the 550 model.
The 500 was fitted with 627B's
Looks like Gerben did one over on the PO, Ken tells me they will work on a 500 but some changes in the Main & Pilot Jet need addressing for it to run right.
If anyone here has fitted 550 carbs on a 500 with the four pipe system & standard air filter system it would be useful to know what jets they used.
One thing for certain is they will have to come off so I can sort them or if a cheap pair came up fit the right carbs.
Nurse Julie:
Depends which air box you have fitted Ted. If you have a 500 air box you need 500 jets, 100/40, if its a 550 air box, you'll need 38/98 jets. Best to see which jets you have in them at present.
Edit.... Plus the corresponding needles and the air mix screws will be different also. One lot have a hole through them, the other lot have no hole through them.
Bryanj:
They were bought as a 500 four set from Gerben via ebay, at the time everybody was saying he is the best but not so sure now
McCabe-Thiele (Ted):
Not a worry Bryan. they have cleaned up nicely.
I'm just hoping it will run okay on 550 carbs if I change some of the jetting.
Do you happen to know Bryan how the two types of Carb body differ?
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