On Mon, 25 Jan 2016 08:59:46 -0500, Stormin Mormon
wrote:

On 1/25/2016 8:34 AM, (PeteCresswell) wrote:

Yup.... Miracle cure. Back to full power and responsive throttle.

But now it is surging most of the time and occasionally backfiring on
full throttle.

This thing must be 10 years old and has never had points or plug
replaced.

Points/plug would be the likely cause, right ?


Surging usually means rusty spring on the
throttle mechanism. (Learned that in a
small engine repair course.)

Unsure about the backfiring.
Too lean will cause both. Don't screw with the governor unless you
know EXACTLY what you are doing.

Being an "old" machine it will have an adjustable high speed jet as
well as an adjustable low speed jet.

Crank the high speed jet out 1/4 turn or so and see what happens.

If it surges at idle you may need to crank the idle mix screw out.