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Post on Hirth F30 Carbs (Mikuni Super BN 38) in Two Strokes
By fillmanw, postedAnyone 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?