Re: SW 6 miss or problem

Posted by Wayne Swenson on March 01, 2006 at 20:40:29 from (24.181.155.110):

In Reply to: SW 6 miss or problem posted by joel shelton on March 01, 2006 at 19:03:48:

Popping in the intake or carb indicates to me intake valve leakage, weak valve spring problems or early timing.
First, make sure the timing is set correctly. Late timing (too small of a gap or incorrect setting) will act like too rich carburetor problems.
Timing should be set so the points open (set the gap first, .016" for battery ignition) when the timing pointer is between the double marks on the pulley; use the crank or turn the fan by hand (switch off) to locate the marks. With the switch off; use an ohmmeter or self powered test light to verify the point opening instant. This can be done with either #1 or #4 at TDC. Loosen the 2 distributor hold-down cap screws and rotate the body of the distributor in the direction of normal rotor travel until the points are closed (test light is on, ohmmeter reads very low ohms). Now rotate the distributor body backwards until the points JUST open; lock the cap screws and you are good to go.
It is CRITICAL for the points have to be CLEAN and ADJUSTED first.
If you have a 12 volt test light, turn on the switch after locating TDC and follow the same procedure. The light is on with points closed and off when the points open.
Needless to say, points, rotor, cap, & wires have to be in decent shape.

Now start the engine & warm it up in NEUTRAL and BRAKES LOCKED; run at WOT (wide open throttle) and turn the high-speed adjusting screw in & out to find the "sweet spot" where the engine runs its fastest & smoothest. Turn this high-speed screw out an extra 1/2--3/4 turn for power. Idle the engine down & set the idle speed. Now turn the idle mixture screw in to richen, out to lean so the idle is smoothest (this is an AIR adjusting screw so works opposite of the main fuel screw on the bottom of the carb). Re-adjust the idle speed. Perform the carb adjusting procedure another time to be sure all mixtures are correct.
Remove the air intake pipe at the carb & try running the engine as you have described. the pipe or passageway through the aircleaner may be blocked.
Let me know if you need more info.

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