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wayne in mn
05-06-2014 11:07:25
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Re: Starting my 300U in reply to Danby, 05-05-2014 22:10:45
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First, accurately locate TDC for #1 cylinder on compression stroke, the points should JUST BEGIN to open at that point. If not, follow the procedure below to set spark timing.
Use an ohmmeter with a low reading setting and attach one lead to the points wire going into the distributor body and the other meter wire to the metal side of the distributor body. (I prefer to remove the cap, rotor, & protective cover over the points so I can see what is going on) Replace the rotor temporarily for reference purposes.
Loosen the distributor hold-down capscrews so you can just rotate the distributor body. Rotate the distributor body CCW (looking from the operator seated position) until the points rubbing block is on the cam lobe highest part. Point gap is .020”. Adjust as needed.
Rotate the distributor body clockwise until the ohmmeter shows that the points are closed. If you cannot get a 0 or nearly 0 reading then clean the contacts with a very fine abrasive and spray some contact cleaner or brake cleaner (no carb cleaner, it leaves residue) and snap the movable point arm with your finger verifying a good, clean connection. You may need to remove the points and clean underneath them. The meter should read infinity with the points open.
Since you previously found TDC #1 cylinder now slowly rotate the distributor body slowly CCW until the meter just begins to indicate the points are opening.
Tighten the hold-down capscrews, replace the points cover & rotor, distributor cap (the rotor should point to #1 tower in the cap), verify the firing order (1-3-2-4 in the CW direction), and you should be good to go.
IF the cap is not cracked, IF the rotor is not carbon tracked, IF the wires are in good condition, IF the sparkplugs are good, all should be well.
I like to remove the coil-to-cap wire at the cap and use a jump gap tester to make sure there is decent spark. (1/4” bright blue and snappy).
Happy “sparking”.
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