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Doms CB550F1 project
Oddjob:
Dom do all the jets bear the Keihin K logo?
I’m thinking someone has used a carb kit on your carbs in the past and the problem is the float needle valves and seat. A lot out there wouldn’t stop petrol flowing past if you held them against each other with your fingers. Lot of reports of the tip of the float needle being made off centre so fuel just leaks past, which would make the engine run rich as hell.
The only way to test is to remove a float bowl, turn on the petrol and use a float height setting tool set to 22mm and use that to lift the float, if the fuel stops when it reaches 22mm then it’s ok, if not then you have a problem. Container under the carb of course. I seem to recall genuine Honda float needles has rubber tips whereas copies just had steel tips. If it doesn’t stop at 22mm see if it stops at a higher setting, if it doesn’t stop at all then you need to replace that entire setup.
DomP:
All genuine jets Ken, I've stripped and replaced all orings etc in the carbs.
The float needles are fully metal, ie no viton tips so maybe worth replacing them, where can I get them as replacements?
DomP:
Nothing i can find suggests they were rubber tipped Ken, everything seems to be metal.
McCabe-Thiele (Ted):
I'm a tad confused Dom, all this talk about the float valves?
Are the carbs flooding?
If not certainly worth ensuring the levels are correct.
DomP:
No flooding Ted, I think Ken was wondering if they were letting fuel through causing rich running as at 2¼ to 2½ turns think i might be a bit rich on some cylinders. No2 and 3 run quite a bit hotter on the exhaust headers
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