Differences

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--- techtalk:ih:engctl01a [2018/09/19 10:32]
hippysmack [Timing (71-78)]
+++ techtalk:ih:engctl01a [2019/01/09 02:49]
ixl2relax ↷ Links adapted because of a move operation
@@ Line 31: / Line 31: @@
     * If you've got advance weights, they and the point cam can become sloppy.
     * So there's a lot that can contribute to the timing jumping around.
+====== Contact Points ======
+===== Single Contact Points - Manual Advance =====
+**A single contact point circuit breaker is operated by a cam with a narrow lobe and a wide lobe**. ((1959-1964 Sportster 55 OHV FSM pg 5F-1))
+  - The narrow lobe times the front cylinder.
+  - The wide lobe times the rear cylinder.
+  * A single ignition coil fires both spark plugs at the same time.
+    * One cylinder on compression stroke, firing the combustion gas creating the power stroke.
+    * The other cylinder through the exhaust stroke (wasted spark).
+    * The non-firing plug will run at the same temperature as the firing plug as long as they're all the same heat range. ((rivethog of the XLFORUM http://xlforum.net/forums/showthread.php?t=1916320&page=4))
+      * If the firing plugs aren't building up carbon, the "spares" shouldn't either.
+      * A spark plug's running temperature/heat range isn't correlated to being connected to the coil.
+  * Timing is advanced or retarded by manually rotating the circuit breaker base in relation to the breaker cam.
+|{{:techtalk:ih:engctl:circuit_breaker_1_by_1957xler.jpg?direct&300|}}|{{:techtalk:ih:engctl:circuit_breaker_2_by_1957xler.jpg?direct&300|}}|
+|  Single Point Circuit Breaker on a 57 XL ((photos by 1957xler of the XLFORUM http://xlforum.net/forums/showthread.php?t=1844586))  ||
+===== Single Contact Points - Auto Advance =====
+**The single set of points are operated the same way as the manual advance (by a cam with a narrow lobe and a wide lobe) with the addition flyweights**. \\ (the spark timing cam is advanced automatically with engine speed) ((1959-1964 Sportster 55 OHV FSM pg 5F-1))
+  - The narrow lobe times the front cylinder.
+  - The wide lobe times the rear cylinder.
+  * A single ignition coil fires both spark plugs at the same time.
+    * One cylinder on compression stroke, firing the combustion gas creating the power stroke.
+    * The other cylinder through the exhaust stroke.
+  * Timing is advanced or retarded with an increase or decrease of engine speed by the action of the flyweights.
+===== Dual Contact Points =====
+**Two independent sets of points are operated by separate cam lobes** (each having it's own cam). ((1959-1964 Sportster 55 OHV FSM pg 5F-1))
+  * Each breaker cam opens the points individually which fires to the alternate cylinders with every revolution of the crankshaft
+  * Dual ignition coils (one for each spark plug) fire each cylinder independently.
+  * Timing is advanced or retarded by the breaking of each set of points by the single lobe cam on the timer shaft.
+===== Setting / Adjusting Point Gap =====
+Point gap should be set before ignition timing adjustments. Incorrect point gap spacing will affect timing. ((57-69 HD Sportster FSM pg 5F-2)) \\
+**Single Contact Point Circuit Breaker**. ((57-69 HD Sportster FSM pg 5F-2)) \\
+Point gap spacing should be exactly .020" (measured with a feeler gauge) when the fiber cam follower is on the highest point of the cam. \\
+  * Loosen the points lock down screw and use the eccentric adjusting screw to move the point gap to the correct setting.
+  * Tighten the lock down screw and re-check the gap, repeat if it moved.
+**Dual Contact Point Circuit Breaker**. ((57-69 HD Sportster FSM pg 5F-2)) \\
+Point gap spacing should be exactly .022" (measured with a feeler gauge) when the fiber cam follower is on the highest point of the cam. \\
+Check ignition timing whenever dual points are adjusted. \\
+Any change in the rear point gap affects timing.
+  * Front (marked with an "F") and rear points are adjusted separately.
+  * Loosen the front lock down screw and use the eccentric adjusting screw to move the point gap to the correct setting.
+  * Tighten the lock down screw and re-check the gap, repeat if it moved.
+  * Then repeat the procedure for the rear points.
+  * Both point gaps should have the same gap spacing.
+===== Setting /Adjusting Ignition Timing =====
+==== Manual Advance Single Point Circuit Breaker ====
+==== Auto Advance Single Point Circuit Breaker ====
+==== Manual Advance Dual Point Circuit Breaker ====
 ====== Internal Circuit Breaker (71-78) ======
 ===== Roll Pin =====
@@ Line 50: / Line 105: @@
 |{{:techtalk:ih:engctl:crank_tdc_and_cam_notch_by_ixl2relax.jpg?direct&300|}}
-====== Timing (57-69) ======
-====== Timing (70) ======
+====== Ignition Timing ======
-====== Timing (71-78) ======
 ===== Setting Ignition Timing with a Cigarette Paper =====
@@ Line 75: / Line 129: @@
 ==== Timing Adjustment ====
-  * First, set the front cylinder on the compression stroke. \\ You [[techtalk:ref:trouble05#find_tdc_compression_using_the_rocker_arms_as_a_visual|can watch for both front push rods to become bottomed out]] ((doodah man of the XLFORUM http://xlforum.net/forums/showthread.php?t=2071019&highlight=circuit+breaker)) (collapse the push rod tubes to see the push rod action) \\ See also [[techtalk:ref:trouble05#find_compression_using_the_finger_method|Using the finger method to find the compression stroke]] and [[techtalk:ref:trouble05#find_compression_using_a_tdc_whistle|Using a TDC Whistle to find the compression stroke]].
+  * First, set the front cylinder on the compression stroke. \\ You [[techtalk:ref:svcproc22#find_tdc_compression_using_the_rocker_arms_as_a_visual|can watch for both front push rods to become bottomed out]] ((doodah man of the XLFORUM http://xlforum.net/forums/showthread.php?t=2071019&highlight=circuit+breaker)) (collapse the push rod tubes to see the push rod action) \\ See also [[techtalk:ref:svcproc22#find_compression_using_the_finger_method|Using the finger method to find the compression stroke]] and [[techtalk:ref:svcproc22#find_compression_using_a_tdc_whistle|Using a TDC Whistle to find the compression stroke]].
   * Next, remove timing hole plug from the left crankcase. \\ Put the front cylinder advance timing mark in the center of the hole while still on the compression stroke.
   * This sets the front piston at 40° before Top Dead Center (TDC) on the compression stroke. \\ (where the spark occurs when the engine is revving at high revs, with the auto advance unit at full advance).
@@ Line 108: / Line 162: @@
     * If point gap exceeds .004" between them, the cam lobe is running eccentric and it should be corrected.
     * Loosen the center bolt and reposition the advance weight assembly toward the widest point gap to equalize the gap. ((70-78 HD Sportster FSM pg 5-35))
-====== Contact Points ======
-===== Single Contact Points - Manual Advance =====
-**A single contact point circuit breaker is operated by a cam with a narrow lobe and a wide lobe**. ((1959-1964 Sportster 55 OHV FSM pg 5F-1))
-  - The narrow lobe times the front cylinder.
-  - The wide lobe times the rear cylinder.
-  * A single ignition coil fires both spark plugs at the same time.
-    * One cylinder on compression stroke, firing the combustion gas creating the power stroke.
-    * The other cylinder through the exhaust stroke.
-  * Timing is advanced or retarded by manually rotating the circuit breaker base in relation to the breaker cam.
-|{{:techtalk:ih:engctl:circuit_breaker_1_by_1957xler.jpg?direct&300|}}|{{:techtalk:ih:engctl:circuit_breaker_2_by_1957xler.jpg?direct&300|}}|
-|  Single Point Circuit Breaker on a 57 XL ((photos by 1957xler of the XLFORUM http://xlforum.net/forums/showthread.php?t=1844586))  ||
-===== Single Contact Points - Auto Advance =====
-**The single set of points are operated the same way as the manual advance (by a cam with a narrow lobe and a wide lobe) with the addition flyweights**. \\ (the spark timing cam is advanced automatically with engine speed) ((1959-1964 Sportster 55 OHV FSM pg 5F-1))
-  - The narrow lobe times the front cylinder.
-  - The wide lobe times the rear cylinder.
-  * A single ignition coil fires both spark plugs at the same time.
-    * One cylinder on compression stroke, firing the combustion gas creating the power stroke.
-    * The other cylinder through the exhaust stroke.
-  * Timing is advanced or retarded with an increase or decrease of engine speed by the action of the flyweights.
-===== Dual Contact Points =====
-**Two independent sets of points are operated by separate cam lobes** (each having it's own cam). ((1959-1964 Sportster 55 OHV FSM pg 5F-1))
-  * Each breaker cam opens the points individually which fires to the alternate cylinders with every revolution of the crankshaft
-  * Dual ignition coils (one for each spark plug) fire each cylinder independently.
-  * Timing is advanced or retarded by the breaking of each set of points by the single lobe cam on the timer shaft.
 ====== Auto Advance / Breaker Weight Springs ======

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