Posted by ss55 on October 27, 2023 at 07:29:44 from (96.42.227.92):
In Reply to: Up and down H posted by Greenspoke on October 27, 2023 at 06:13:51:
Sounds like plugged or restrictive idle passage in the the carburetor. Is it is mostly running on the load circuit causing it to hunt and surge between wide open throttle and shutting down?
Sometimes closing down the idle jet needle and opening it up again is enough to crush or dislodge an obstruction at the needle. It is a long shot, but the simplest and easiest thing to try first. Be gentle not to damage the needle or seat by forcing the needle too much, and count the turns while closing to return it to the original setting to see it it made a difference.
A rule of thumb is to only change one thing at a time and then check if the last change helped or hurt.
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