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Post by bolgerr560 on Jul 10, 2023 20:55:49 GMT 1
Hi guys.
I’m on the forum nearly 3 years now but this is my first post as I’m not great at this kind of thing. I’m desperately in need of some help with my tachometer.
Currently nearly finished a full refresh on my 1985 ypvs f1.
Problem is somewhere along the line someone tried to make it a 31k and changed fairings etc anyways I’m not one for factory fresh as it’s just not me.
The problem I am having is my tachometer cannot be got to work. I’ve sent it off to be repaired which took 4 months but when it returned still no joy! It’s the 3 wire electronic feed type.
Obviously the black is an earth and then the brown is ignition live which is giving me 14v with the bike on idle but the 3rd wire (possibly blue) is giving me 122-125 v on idle! Is this normal or is this the cause ? I’ve currently sent my tachometer off for repair to a different company to see if they can find any thing wrong, but I have a spare 3 wire tachometer here (not sure what it’s off) but it works just idles very high. Please any help would be greatly appreciated as I cannot find anything online.
Also I’m very sorry if this is posted in the wrong section please feel free to move. Thanks guys.
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Post by midlifecrisisrd on Jul 10, 2023 21:03:49 GMT 1
F1 and F2 bikes use the signal from the cdi to the power valve controller for the rev counter
It is not like the identical looking FZ and FZR rev counters which use a pulse off the ignition signal
The signal on an F1/2 is from the black/yellow wire and usually a grey wire at the clocks
Strve
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Post by bolgerr560 on Jul 10, 2023 21:08:44 GMT 1
I have also tested the black and yellow wire coming out of the cdi and I’m getting the same 122-125 volts there. Is that normal? Seems extremely high?
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Post by midlifecrisisrd on Jul 10, 2023 21:21:13 GMT 1
I've never measured it if I'm honest
I do know that if you don't have a battery connected it can fry the rev counter
Steve
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Post by bolgerr560 on Jul 10, 2023 21:40:07 GMT 1
It’s possible that could of been the original problem but you think after it been “repaired” this should of been rectified? Unfortunately there’s not a big rd scene here in Ireland, so hopefully someone on here might know. Just thought maybe my cdi might be putting out too much voltage and frying the clocks?.
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Post by midlifecrisisrd on Jul 10, 2023 22:38:56 GMT 1
Suppose anything is possible
What cdi are you using, is it the one marked 52y50
They are usually quite reliable
Steve
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Post by JonW on Jul 11, 2023 3:05:34 GMT 1
While ive also never measured the output of the CDI, but it has been said that these bikes out put more than what many older style aftermarket units could take, ie >12v. Many more modern units use the feed as a trigger, not as an actual feed so are protected from the volts.
You need to find someone to measure an 85-on ypvs when its running for you. Id do it but cant get to one of those bikes right now to test for you. Someone on here might have better access?
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Post by bolgerr560 on Jul 11, 2023 4:19:55 GMT 1
Suppose anything is possible What cdi are you using, is it the one marked 52y50 They are usually quite reliable Steve I’m not sure what cdi Is on the bike off the top of my head. I will have to check it this evening when I get home from work. Hopefully it’s not a cdi issue |
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Post by bolgerr560 on Jul 11, 2023 4:22:49 GMT 1
While ive also never measured the output of the CDI, but it has been said that these bikes out put more than what many older style aftermarket units could take, ie >12v. Many more modern units use the feed as a trigger, not as an actual feed so are protected from the volts. You need to find someone to measure an 85-on ypvs when its running for you. Id do it but cant get to one of those bikes right now to test for you. Someone on here might have better access? Yeah if I could get a comparison off another bike it would be ideal. Unfortunately I don’t know of anyone with one to ask. Hopefully someone on here could do it. It would be a great help. At least then il know if I have a problem or not. |
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Post by muttsnuts on Jul 11, 2023 20:48:08 GMT 1
just run a wire from the black/yellow wire from the CDI up to the clock and connect it to the grey (or as you say maybe Blue) wire, if that doesn't work I'd say you've the wrong clock for the bike, the F2 rev counter can be either low voltage (122 to 125v) or a high voltage one (250 to 300v I think), if the latter, then it won't work with the low voltage output
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Post by bolgerr560 on Jul 11, 2023 22:47:19 GMT 1
just run a wire from the black/yellow wire from the CDI up to the clock and connect it to the grey (or as you say maybe Blue) wire, if that doesn't work I'd say you've the wrong clock for the bike, the F2 rev counter can be either low voltage (122 to 125v) or a high voltage one (250 to 300v I think), if the latter, then it won't work with the low voltage output Perfect thanks for the idea, I left my clock down to a company today to see if they can find any issues with it. Is there any way to tell the difference in the low and high voltage clocks? Would the clock not working effect how the powervalve works? |
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Post by bolgerr560 on Jul 12, 2023 5:13:41 GMT 1
Sorry also another thing, when the wires were swapped positions ( blue/grey signal wire and brown ignition live ) the bike would not start? Is that normal or is it a wiring problem I have ?
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Post by muttsnuts on Jul 13, 2023 21:50:50 GMT 1
not sure, never done that ! - suspect it could ground out the ignition coil pulse, so yeah would sound about right it not starting, would be like hitting the kill switch
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Post by bolgerr560 on Jul 13, 2023 23:54:19 GMT 1
Ah perfect thanks for the help. I delivered the rev counter yesterday to another company to see if they can find an issue, hopefully have it back in a week. If that doesn’t sort it I think I’m just going to give up 😂
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Post by bolgerr560 on Jul 25, 2023 9:16:15 GMT 1
UPDATE.. I just heard back from the company that I left the tachometer into be repaired with. He says there is a capacitor burnt out in it and it’s €150 just for the capacitor. Does anyone have an idea if this could of been caused from someone running the bike with a bad battery or could I have another issue ?
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Post by Chewie01 on Jul 25, 2023 14:26:40 GMT 1
Capacitors can die over time as the dielectric brakes down.
As you have narrowed to fault down to the tacho, then the easiest solution would be to get a second hand one.
If you make one more post you will unlock the wanted and for sale section of this site. I would therefore recommend making one more post and then putting a wanted ad up as I'm sure there must be people with them that are willing to part with it.
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Post by bolgerr560 on Jul 25, 2023 19:44:57 GMT 1
Ah brilliant, yeah il be sure to check that out. Thanks for your help!
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