Lightning
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| posted on 4/2/10 at 12:06 PM |
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Tacho question
Car nearing completion, I have a small problem of the tacho redaing twice the true reading. This is also with true with the Speedwell. I guess its
because its getting the pulse from the coil pack which has a waste spark. Where should I get the pulse from??? ZZR1200 BTW
Many thanks
Steve
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blakep82
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| posted on 4/2/10 at 12:30 PM |
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what ignition system is it?
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Lightning
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| posted on 4/2/10 at 12:38 PM |
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The Kawasaki system from the bike. Its on zzr1100 carbs BTW
Steve
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matt_gsxr
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| posted on 4/2/10 at 12:42 PM |
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I guess you have a wasted spark ignition, hence the double reading.
Can you change the setting to make it 2-stroke. That fires each cycle and then it will be fine again.
I don't know of an easy way to halve the pulses (I guess you could build some kind of flip-flop circuit which would halve the pulse rate). The
Dyna 2000 ignition units have 2 different outputs for tachos (one every cycle and one with 2 per cycle). Does your CDI not have an appropriate
output, sometimes they do.
Matt
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BenB
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| posted on 4/2/10 at 12:43 PM |
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Yes you could just put a flip-flop circuit in it series. Would cost all of a pound and take about 30 min to make slowly.
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Brommers
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| posted on 4/2/10 at 01:21 PM |
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The tacho output from the ECU will usually give one pulse per engine revolution (it does on all the bike engines I've played with). Looks like
it's a light blue wire coming from pin 23 on the ECU according to the ZX12R wiring diagram I've found here.
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matt_gsxr
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| posted on 5/2/10 at 11:40 PM |
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Brommers,
Not sure this is the case with Suzuki engines.
Just noticed that you have updated your pages. Nice one. I got a bit bored of looking at those data-log outputs from September.
Matt
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