My 350cc Scrambler is fitted with a Saches ZD 3.12 electronic ignition which has 9 different curves. Which one would be most suitable? Has anyone got one and which one did you choose?
Not looking to "tune-up" or go racing, just the bog standard set-up would be fine.
Also there is a certain amount of "kick-back" when starting which makes me wonder if the pick-ups are set correctly in the first place.
Setting the ignition curve with a Sachse ZDG 3.12
Moderator: ajleone
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Re: Setting the ignition curve with a Sachse ZDG 3.12
Aye John,
I assume from your post that you already have downloaded a copy of the pdf installation manual?
Link: manuals/Z19-D-3.12-en
Maximum advance for a 350 motor is between 33 degrees and 36 degrees, Before Top Dead Centre (BTDC) @ 3,000rpm.
Therefore, it would appear from the Sachse advance curve diagram that either advance curve 4 (yellow) or 5 (lime green) would be suitable for maximum advance. What difference the more rapid rise to full advance, curve 5 (lime green) makes to the tractability of the engine, when compared against the slower rise to full advance of curve 4 (yellow), I am not able to say. I could guess, but that is of no help.
I would advise that you drop an email directly to Nigel Lacey to find out if he has a preference for the road going motor from experience, as he sells these ignition systems.
My regards, Bill
I assume from your post that you already have downloaded a copy of the pdf installation manual?
Link: manuals/Z19-D-3.12-en
Maximum advance for a 350 motor is between 33 degrees and 36 degrees, Before Top Dead Centre (BTDC) @ 3,000rpm.
Therefore, it would appear from the Sachse advance curve diagram that either advance curve 4 (yellow) or 5 (lime green) would be suitable for maximum advance. What difference the more rapid rise to full advance, curve 5 (lime green) makes to the tractability of the engine, when compared against the slower rise to full advance of curve 4 (yellow), I am not able to say. I could guess, but that is of no help.
I would advise that you drop an email directly to Nigel Lacey to find out if he has a preference for the road going motor from experience, as he sells these ignition systems.
My regards, Bill
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Re: Setting the ignition curve with a Sachse ZDG 3.12
I don't know about Sasche, but another elec ignition box I've used would not provide any retard at low battery voltage, which caused kick-back.
Graphs here show all curves with no advance until 1000 rpm, so none should be likely cause of kickback, if timed correctly?
I have some old bikes with manual advance and retard, from which I've learned that timing isn't really so sensitive, apart from at start/idle and full advance. They are not race bikes.
Graphs here show all curves with no advance until 1000 rpm, so none should be likely cause of kickback, if timed correctly?
I have some old bikes with manual advance and retard, from which I've learned that timing isn't really so sensitive, apart from at start/idle and full advance. They are not race bikes.
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