How to identify correct float needle? 1981 CB750c

Posted by chickenstrips on
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/How-to-identify-correct-float-needle-1981-CB750c-tp4046210.html

I have a bike that was running lean on all four. Opened the carbs and found right away that the float heights are all a consistent 17.5-17.9mm!

I doubt that all four floats are somehow off by the same degree and there is evidence that there has been carb work done before. The evidence doesn't give me the most confidence: the screws for the choke plates weren't flared to secure them and one plate was installed backwards!

My guess is that they bought four like needle valves which were incorrect size.

How do I identify if the valve is correct? It is seating properly, no question about it.