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Post by JonW on Jun 8, 2020 2:25:26 GMT 1
Im sure someone has been round this before but I cant seem to find it if they have.
Anyway, trying to use a later tacho on the earlier bike instead of the mechanical cable drive.
Is there some way to use say the black/yellow or orange wires from the OEM loom or should I look at the Zeeltronic output as the bike has a zeel fitted.
I ask as i once read that the Zeeltronic and the OEM 85-on electric tacho were incompatible, ie the Zeel output was huge and the tacho was delicate and wanted a small voltage feed and obviously my concern is blowing the tacho.
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Post by marrcel on Jun 8, 2020 6:50:27 GMT 1
I run an el cheapo china tacho. I pick the pulse from the orange wire the primair coil
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Post by marrcel on Jun 8, 2020 7:05:28 GMT 1
My china tacho needs 2,7 volt to trigger. Ik tested that. If you measure the pulse from you zeel. You can calculate a voltage reducer made by two resistors.
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Post by JonW on Jun 8, 2020 8:09:13 GMT 1
Ahh ok, cool ta Marcel. I should say that this is not actually for me and I dont know which zeel they have, but i can work on that. I dont think either me or the owner is confident with the resistor thing. Using them has never worked for me sadly, perhaps i should lean it tho.
Has any one sucessfully run the later tacho from the bike loom?
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Post by midlifecrisisrd on Jun 8, 2020 8:39:11 GMT 1
Ahh ok, cool ta Marcel. I should say that this is not actually for me and I dont know which zeel they have, but i can work on that. I dont think either me or the owner is confident with the resistor thing. Using them has never worked for me sadly, perhaps i should lean it tho. Has any one sucessfully run the later tacho from the bike loom? Yup My 385 is lc2 loom and later ypvs tacho It has a Zeel now but did originally run the 29k50 cdi and pv controller If you look at the wiring diagram for the 85 the grey wire for the tacho trigger simply connects to the black yellow (from memory) pv signal from the cdi to the pv controller If you run an extra wire through the front section of the loom from the headlight bucket down to the cdi area (I use a length of 4mm nylon tubing as a snake to get through the pvc section of the loom) you can tap into the wiring at the cdi If using a Zeel it still has a ypvs tacho out put and a 1 pulse per rev output if you were running a different tacho Alternatively if you can get a hold of a 3hm1 tacho you can connect that to the orange wire at the coil As these had no separate pv controller or signal output the tacho is 2 pulse per rev. Steve |
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Post by rich on Jun 8, 2020 12:35:43 GMT 1
Use the YPVS signal wire and take a 12v and ground from the temperature gauge feed
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Post by midlifecrisisrd on Jun 8, 2020 12:38:14 GMT 1
Use the YPVS signal wire and take a 12v and ground from the temperature gauge feed That's exactly what I do 👍 Steve |
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Post by JonW on Jun 8, 2020 13:41:48 GMT 1
Cool thanks guys! I thought that might be the case, but thought I should check. Knew you'd not let me down!  |
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Post by leighton1271 on Jan 10, 2022 23:05:15 GMT 1
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Post by midlifecrisisrd on Jan 10, 2022 23:17:21 GMT 1
Afraid that's not a ypvs tacho
10500 red line gives it away
Its off a four stroke and must be fed from the coil so getting 2 pulses per rev instead of the one a 4 stroke gives
A Zeel has a 1 pulse per rev output
Or fit a ypvs tacho and trigger from the PV/cdi trigger wire (not a pulse signal so won't work with a 4 stroke tacho)
Steve
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Post by midlifecrisisrd on Jan 10, 2022 23:19:14 GMT 1
Oh and it is the black/yellow but only for a ypvs tacho
Steve
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Post by leighton1271 on Jan 10, 2022 23:20:51 GMT 1
Thanks Steve
Would connecting to the orange cable on the coil provide the correct pulse do you think?
Thanks again
Leighton
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Post by midlifecrisisrd on Jan 11, 2022 9:51:28 GMT 1
It should be the correct "type" of pulse but will read double
A four stroke coil usually gives 1 pulse per revolution
Both 2 and 4 strokes are usually wasted spark as in 1 coil shares 2 cylinders
A 4 stroke will fire every time the piston approaches tdc so the 2 cylinders the coil feeds will fire on the compression stroke and the exhaust stroke but the exhaust stroke spark is wasted as nothing to ignite. Remember a 4 stroke only makes a bang every 2 revolutions
A 2 stroke coil will also share 2 cylinders but a 2 stroke bangs every revolution so one cylinder will be at TDC and the other at BDC so at BDC there is no compressed fuel mixture so no bang
So 2 sparks per revolution
This means that a 4 stroke tacho connected to a 2 stroke coil should read double
I've previously connected a 4 stroke tacho to the PV trigger and it wouldn't work. Just behaved erratically hence me thinking it's a different type of signal
You need a ypvs rev counter or a converter to change 2 pulses per rev to 1
I'm sure such a thing exists as when building Yamagamas I think the RGV uses separate coils so you need a converter to get the rgv tacho to work with the ypvs electrics
Zeeltronic may have one
Steve
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Post by leighton1271 on Jan 11, 2022 18:09:14 GMT 1
Well, I hope I’ve done the right thing. I’ve bought an RD 500 tachometer, with it being 2 stroke and not cable fed, looking at the wiring diagram it works off the same connection as the ypvs. 🤞 it’s a good one!!
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