Re: Do any components need to be changed after a 0.125 overb

Posted by Steve@Advance on August 25, 2022 at 20:12:48 from (99.190.215.237):

In Reply to: Do any components need to be changed after a 0.125 overb posted by zacklars97 on August 25, 2022 at 18:03:48:

Several factors can contribute to hard starting.

The mag, can you hear the impulse function clacking while cranking? If it's
not, there won't be enough spark at cranking speed. Have you checked the
ignition timing?

What kind of wires did you use? Mags need wire core wires, not resistor,
especially not carbon wires.

Since the rebuild, have the valves been set? Always a good idea to retorque
the head bolts and set the valves after the first run up to temperature.

Is the air cleaner properly serviced and free flowing? They can be internally
clogged with dirt or mouse/bird/mud dobber nests. So can the exhaust.

The carb should be adjusted last after everything else has been checked out.
The carb needs to be properly functioning, not flooding, be supplied with
plenty of fresh, clean fuel, no vacuum leaks, choke and governor linkage
properly adjusted and working.

Once running, look and listen! Balky and weak usually means too lean.
Blubbering black smoke is too rich. With the engine up to operating
temperature, idle set as slow as practical, adjust the idle mixture for best
idle. To adjust the high speed, idle the engine down, turn the high speed
adjust in 1/4 turn at a time, open the throttle suddenly. Listen for the
response. Keep leaning the mixture, repeating the test until it lean balks on
quick acceleration. Then start backing the mixture screw out 1/4 turn at a
time until the engine will take sudden full throttle from idle without
hesitation. A touch of black smoke is good, it should clear up as soon as the
engine comes up to speed.

As for the plugs, once everything is properly adjusted and some up to
temperature running, preferably under load, the plugs can be 'read'. Look at
the inner insulator, if it is brown, the plugs are in range. if black, they
are too cold, white is too hot.

Again, everything works together. If any one thing is neglected or out of
tolerance, results will vary! If the engine has been run rich, the oil may be
contaminated with gas. That will change the carb adjustments and plug color.
Change the oil if in doubt.

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