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Content tagged 'mikuni super bn 38'

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  1. Anyone out there have experience tuning Mikuni pump carbs? I have never worked on these type carbs. Having 4 of them seems to add a level of complexity that sucks....Figured i'd hit up the forum....
    Engine running super lean and fast throttles all completely closed. I am thinking that with the extremely low manifold pressure and having a high pop off pressure (55psi) was the problem.
    The pilot jet is a 77.5 and the high is a 80. The needle is a 1.5. This combo does mot line up with anything on Mikuni's charts.
    I'm changing the spring to make the pop off pressure to 22psi. Any thoughts?