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FE Technical Forum / Re: Surging at light cruise
« on: September 03, 2026, 11:33:21 AM »
Sounds like a potential transition from off idle to mains being in fully. Surging often indicates lean condition. You could experiment with mixture screws. Back ‘em out 1/4 turn at a time. Even if this compromises a lean quality idle it could confirm you are lean at cruise.
If confirmed then you could re-set screws and take air away via idle air bleeds, ( if carb is so equipped). Also experiment with taking air away from HSAB,( again, if carb is equipped with them).
I have found that from engine to engine, the time that the HSABs become impactful varies. At the rpm you are having the problem it could be either.
If confirmed then you could re-set screws and take air away via idle air bleeds, ( if carb is so equipped). Also experiment with taking air away from HSAB,( again, if carb is equipped with them).
I have found that from engine to engine, the time that the HSABs become impactful varies. At the rpm you are having the problem it could be either.
