Reply To: Howard the Hunter.

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That’s right. It is the original Kohler carburettor, with a main jet adjustment going vertically down, an angled idle jet, and a horizontal screw for idle speed adjustment.

Currently the main jet is set 1 3/4 turns out, the idle jet 2 1/4 turns out, not that it’s particularly a fixed setting, even from new (although I don’t think I have ever adjusted these before).

After the 25-year or thereabouts gap in operation, there was some varnish in the carb, but I soaked it in acetone, and blew through the various holes and galleries with compressed air, so hopefully they are clean.

Is carburettor adjustment likely to be the culprit, rather than control cables, governer? I hope so!