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ignition points
- Old Man Rock
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- Patton
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28 Dec 2008 08:50 - 28 Dec 2008 09:31 #255077
by Patton
1973 Z1
KZ900 LTD
Replied by Patton on topic ignition points
kzstu wrote:
Hello, Stuart, and WELCOME to KZr!
We're glad you're here!
Until specific manual is available (am guessing here), but would clean and set points gap at .014" or .35mm (or just use a matchbook cover if in a pinch).
Note two small wires going to the ignition coil. One of them provides positive battery voltage to the coil. The other goes through the closed points to ground. When the points open, the ground is lost, which causes the coil to fire high voltage through the plug wire to the spark plug.
Assure that positive battery voltage is reaching one coil terminal when the ignition switch is turned on.
Assure continuity of the wiring between the other coil terminal through closed points to ground. This allows the coil to charge while the points are closed.
Until running, resort to static timing by adjusting so that points just begin to open when the timing mark (typically an F mark located on the advancer unit) aligns with the permament timing mark on the engine case. Ignore any T mark which may also be visible.
May use ohmmeter probe tips between points contacts to determine when continuity breaks. This is when the points begin to open and when the F mark should align. Or a 12 volt bulb may be rigged to turn off when the ground is broken as the points open. It is very difficult to simply eyeball the exact moment points begin to open.
When running, use a strobe-type timing light to fine tune the F mark alignment at idle rpm. And assure smooth operation of advancer by watching the timing move back and forth as rpm is varied.
Check quality of spark by removing the plug, connect it to the coil lead, hold the spark plug base against the engine, turn ignition on, assure transmission is in neutral, "crank" the engine to spin it over (using kick start or starter motor), visibly inspect the spark at business end of plug.
If there's no spark, something is wrong other than ignition timing.
And at this stage, even with a perfect spark that's perfectly timed, there's still a lot to do before being able to fine tune the carbie.
I would begin by first assuring existence of a good quality spark. Then timing, compression, valve clearances, air and fuel supply to carbs, likely carb restoration, etc., with fine tuning of carbs being the very last procedure.
Good Luck!
kz250a...bought it not running and was told that the points were out...found that a wire had broken....ignition points and timing are out. my question is what feeler gauge do i use between the points and how do i set the timing right?
also how do i fine tune the carbie?
cheers guys any help would be appreciated.
stu.
Hello, Stuart, and WELCOME to KZr!
We're glad you're here!
Until specific manual is available (am guessing here), but would clean and set points gap at .014" or .35mm (or just use a matchbook cover if in a pinch).
Note two small wires going to the ignition coil. One of them provides positive battery voltage to the coil. The other goes through the closed points to ground. When the points open, the ground is lost, which causes the coil to fire high voltage through the plug wire to the spark plug.
Assure that positive battery voltage is reaching one coil terminal when the ignition switch is turned on.
Assure continuity of the wiring between the other coil terminal through closed points to ground. This allows the coil to charge while the points are closed.
Until running, resort to static timing by adjusting so that points just begin to open when the timing mark (typically an F mark located on the advancer unit) aligns with the permament timing mark on the engine case. Ignore any T mark which may also be visible.
May use ohmmeter probe tips between points contacts to determine when continuity breaks. This is when the points begin to open and when the F mark should align. Or a 12 volt bulb may be rigged to turn off when the ground is broken as the points open. It is very difficult to simply eyeball the exact moment points begin to open.
When running, use a strobe-type timing light to fine tune the F mark alignment at idle rpm. And assure smooth operation of advancer by watching the timing move back and forth as rpm is varied.
Check quality of spark by removing the plug, connect it to the coil lead, hold the spark plug base against the engine, turn ignition on, assure transmission is in neutral, "crank" the engine to spin it over (using kick start or starter motor), visibly inspect the spark at business end of plug.
If there's no spark, something is wrong other than ignition timing.
And at this stage, even with a perfect spark that's perfectly timed, there's still a lot to do before being able to fine tune the carbie.
I would begin by first assuring existence of a good quality spark. Then timing, compression, valve clearances, air and fuel supply to carbs, likely carb restoration, etc., with fine tuning of carbs being the very last procedure.
Good Luck!
1973 Z1
KZ900 LTD
Last edit: 28 Dec 2008 09:31 by Patton.
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