Differences

This shows you the differences between two versions of the page.

--- techtalk:ih:engctl01a [2018/09/19 10:32]
hippysmack [Timing (71-78)]
+++ techtalk:ih:engctl01a [2023/12/30 03:34]
hippysmack
@@ Line 13: / Line 13: @@
 ====== External Circuit Breaker (57-70) ======
-|  Circuit Breaker ((photo by Pablo83 of the XLFORUM http://xlforum.net/forums/showthread.php?threadid=1569256&page=7))  | 1960 Sportster Circuit Breaker ((photo by Ozark of the XLFORUM http://xlforum.net/forums/showthread.php?p=2509874))  |
+|  Circuit Breaker ((photo by Pablo83 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/144683-magneto-ch-porn-thread/page7?threadid=1569256&page=7))  | 1960 Sportster Circuit Breaker ((photo by Ozark of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/92341-just-picked-up-a-1960-basket-case/page2#post1921155))  |
 |{{:techtalk:ih:engctl:circuit_breaker_by_pablo83.jpg?direct&300|}}|{{:techtalk:ih:engmech:1960_sportster_circuit_breaker_by_ozark.jpg?direct&300|}}|
@@ Line 20: / Line 20: @@
   * The magneto has been changed out to a circuit breaker ignition on many XLCHs
-|  Circuit breaker ignition on a 70 model XLCH  ((photo by savagegarden of the XLFORUM http://xlforum.net/forums/showthread.php?t=1844816))  |
+|  Circuit breaker ignition on a 70 model XLCH  ((photo by savagegarden of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/172193-advantages-of-using-a-magneto?t=1844816))  |
 |{{:techtalk:ih:engctl:circuit_breaker_ignition_on_a_70_xlch.jpg?direct&300|}}|
-  * You've got 2 sets of gears that turn the circuit breaker. ((needspeed of the XLFORUM http://xlforum.net/forums/showthread.php?t=2033659&highlight=circuit+breaker))
+  * You've got 2 sets of gears that turn the circuit breaker. ((needspeed of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/190797-1968-xlch-900-timing-question?t=2033659&highlight=circuit+breaker))
     * The pinion turning the cam gear.
     * Then the cam gear turning the circuit breaker (distributor).
@@ 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 https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/178207-69-dual-plug-heads-with-timer/page4?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 https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/171998-valve-timing-off?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 =====
-AKA "split pins". These are hollow pins that have a split in them and are held in holes by their own spring tension. ((needspeed of the XLFORUM http://xlforum.net/forums/showthread.php?t=2003348)) \\
+AKA "split pins". These are hollow pins that have a split in them and are held in holes by their own spring tension. ((needspeed of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/187639-timing-180-deg-out?t=2003348)) \\
-It is possible to have it 180° out by mashing down the pin while tightening everything up. ((Ferrous Head of the XLFORUM http://xlforum.net/forums/showthread.php?t=2003348&page=2)) \\
+It is possible to have it 180° out by mashing down the pin while tightening everything up. ((Ferrous Head of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/187639-timing-180-deg-out/page2?t=2003348&page=2)) \\
 It's also common for the breaker cam pin to be sheared off flush with the base and covered in grime so you can't tell the correct orientation for the cam. \\
 It'll install both ways like this, but only one position will fire the plugs correctly. ((doodah man of the XLFORUM http://xlforum.net/forums/showthread.php?t=2003348&page=2)) \\
-If the first roll pin is pushed too deep, it can cause problems with getting both gaps even. \\ It will cock the advanced unit and not let it seat flush on the cam. ((Sadsack of the XLFORUM http://xlforum.net/forums/showthread.php?t=2003348&page=2)) \\
+If the first roll pin is pushed too deep, it can cause problems with getting both gaps even. \\ It will cock the advanced unit and not let it seat flush on the cam. ((Sadsack of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/187639-timing-180-deg-out/page2?t=2003348&page=2)) \\
 If the bike will backfire, spit and cough very badly with the cam plate adjusted, \\
@@ Line 50: / Line 106: @@
 |{{: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 130: @@
 ==== 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 163: @@
     * 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 ======

Trace:

Differences

Navigation

Search

Toolbox