SOHC.co.uk Forums > CB500/550
500 carbs what does what question.
Nurse Julie:
Yes Ted. The carb bodies are the same, it's the jetting etc that is different.
DomP:
Sorry to butt in on this Ted but how critical is the airbox lid to the running of a 550? I don't have a lid yet due to my custom seat design so I'm currently trying to tune it without. My plan is to mould one with a similar sized mesh aperture.
McCabe-Thiele (Ted):
I have no practical or anecdotal evidence about what effect if any having the lid makes.
On the carb induction side the air filter will give a certain restriction to the air flow into the carbs so there will be a pressure loss across the air filter itself. Although the lid covers the top of the air box the top section with the gauze fitted is not going to be the main cause of additional intake restriction. If there is a consequence it might run marginally leaner at higher rpm.
Bryanj:
Dom, sorry cant remember which 550 you have, the us K0,1,2 use the 500 cover the European F and K3 use a different one that restricts air flow more hence smaller jets
DomP:
--- Quote from: Bryanj on June 09, 2024, 06:04:32 PM ---Dom, sorry cant remember which 550 you have, the us K0,1,2 use the 500 cover the European F and K3 use a different one that restricts air flow more hence smaller jets
--- End quote ---
F1 Bryan, in the absence of a filter cover and my seat design means I need make one in fibreglass I think, so having no cover is definitely going to cause me set up problems then?
I have discovered a big oversight on my part while assembling my carbs, I had used two open pipes where there should have been link pipe between no2 and no3 carb so they were drawing in air.
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