CARB TECHNICAL. |
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OS9B CARB.
I found on the CMB 90/91 and 45RS and 45VAC that the OS 9B works well. Good power and nothing
breaks on the carb. I did find a few improvements though. Firstly I found
that when the midrange needle is adjusted for good throttling, the carb
can be too lean at tickover and very low throttle openings. This is caused
by the shape of the needle. I modified the needle as shown below by changing it
to a straight taper. The needle can then be adjusted for the best
throttling.. The top drawing is the original needle, the lower
drawing is the modified needle with straight taper
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