Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
|
techtalk:ih:engctl01a [2018/09/19 15:00] hippysmack [Single Contact Points - Manual Advance] |
techtalk:ih:engctl01a [2023/12/30 03:34] hippysmack |
||
|---|---|---|---|
| Line 13: | Line 13: | ||
| ====== External Circuit Breaker (57-70) ====== | ====== 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|}}| | |{{: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 | * 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|}}| | |{{: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. | * The pinion turning the cam gear. | ||
| * Then the cam gear turning the circuit breaker (distributor). | * 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. | * 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. | * So there's a lot that can contribute to the timing jumping around. | ||
| + | |||
| ====== Contact Points ====== | ====== Contact Points ====== | ||
| ===== Single Contact Points - Manual Advance ===== | ===== Single Contact Points - Manual Advance ===== | ||
| Line 39: | Line 40: | ||
| * One cylinder on compression stroke, firing the combustion gas creating the power stroke. | * One cylinder on compression stroke, firing the combustion gas creating the power stroke. | ||
| * The other cylinder through the exhaust stroke (wasted spark). | * 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)) | + | * 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. | * 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. | * A spark plug's running temperature/heat range isn't correlated to being connected to the coil. | ||
| Line 45: | Line 46: | ||
| |{{:techtalk:ih:engctl:circuit_breaker_1_by_1957xler.jpg?direct&300|}}|{{:techtalk:ih:engctl:circuit_breaker_2_by_1957xler.jpg?direct&300|}}| | |{{: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 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 ===== | ===== Single Contact Points - Auto Advance ===== | ||
| Line 55: | Line 56: | ||
| * The other cylinder through the exhaust 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. | * Timing is advanced or retarded with an increase or decrease of engine speed by the action of the flyweights. | ||
| - | |||
| ===== Dual Contact Points ===== | ===== Dual Contact Points ===== | ||
| Line 62: | Line 62: | ||
| * Dual ignition coils (one for each spark plug) fire each cylinder independently. | * 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. | * 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 ===== | ===== 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)) \\ | Point gap should be set before ignition timing adjustments. Incorrect point gap spacing will affect timing. ((57-69 HD Sportster FSM pg 5F-2)) \\ | ||
| Line 88: | Line 89: | ||
| ====== Internal Circuit Breaker (71-78) ====== | ====== Internal Circuit Breaker (71-78) ====== | ||
| ===== Roll Pin ===== | ===== 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'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)) \\ | 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, \\ | If the bike will backfire, spit and cough very badly with the cam plate adjusted, \\ | ||
| Line 129: | Line 130: | ||
| ==== Timing Adjustment ==== | ==== 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. | * 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). | * 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). | ||
