Wassel woes with Koso speedos....

[carlos fandango]

... one of the yellows out of the stator while its still a/c ...

do you regulate that at all ? the voltage there can be 30,40,50...all over the place... tachos can be sensitive to voltage variations.... although i have never tried a koso one

... it mostly works.

Byron, You were one of the ones developing the the wassel conversion and im sure youve done plenty. Have you had any issues with new rev counters after the conversion ?

[byron]

Have you had any issues with new rev counters after the conversion ?

I've not fitted any to any of the scooters i have DC'd. I use a tacho from a honda which does need 12v DC to power it. If the meter is meant to get it's power [not the ignition pulse] from AC, then I'd try as eden did; use of one of the "yellow"s from the stator, but through a regulator.
That may not work of course... I don't want to be responsible for damaging any meters...
Maybe firekdp will read this and give his informed view.

[firekdp]

Have you had any issues with new rev counters after the conversion ?

I've not fitted any to any of the scooters i have DC'd. I use a tacho from a honda which does need 12v DC to power it. If the meter is meant to get it's power [not the ignition pulse] from AC, then I'd try as eden did; use of one of the "yellow"s from the stator, but through a regulator.

Don't know much about the SIP rev counters but if they work on an AC pulse they shouldn't really be advertised as suitable for DC machines.
However, once connected to the wassel reg the yellow AC wires will be regulated. Compare the voltage of them whilst connected against unconnected.
I don't know what signal the gauge is looking for but if it only counts the positive pulses, then one yellow feeding it (half wave) will be sufficient.
If the gauge needs the full AC signal, then both yellows would need to be used. This would mean that the gauge would need isolating from earth (earth connection now fed from second yellow). The power wire would also, now, have to be AC and also connected to the yellow as otherwise it would only get half wave.

[Monty]

guys
Am I on the wrong track with this thread the Koso one shown is a Speedo and rev counter and I understood the speedo part is fine so surly its set up for DC or it would not work at all. If that's the case your problem sounds like the pick-up for the tacho, I have been looking at various digital Tacho's and most now dont use the induction wrap round type of pick-up. If yours has to be this type I would go down the route of shielding the pick-up wire back to the speedo. Does it respond to revs or is it just not stable?
I don't want to blow your gauge either but have you tried connecting to your green at the ignition switch, that's how the Acewell one works.

[carlos fandango]

Have you had any issues with new rev counters after the conversion ?

I've not fitted any to any of the scooters i have DC'd. I use a tacho from a honda which does need 12v DC to power it. If the meter is meant to get it's power [not the ignition pulse] from AC, then I'd try as eden did; use of one of the "yellow"s from the stator, but through a regulator.

Don't know much about the SIP rev counters but if they work on an AC pulse they shouldn't really be advertised as suitable for DC machines.
However, once connected to the wassel reg the yellow AC wires will be regulated. Compare the voltage of them whilst connected against unconnected.
I don't know what signal the gauge is looking for but if it only counts the positive pulses, then one yellow feeding it (half wave) will be sufficient.
If the gauge needs the full AC signal, then both yellows would need to be used. This would mean that the gauge would need isolating from earth (earth connection now fed from second yellow). The power wire would also, now, have to be AC and also connected to the yellow as otherwise it would only get half wave.

The speedo i have is for DC and ive wired it up as suggested in the instructions. It picks up the signal from a wire wrapped around the HT lead or conected to the coil (mines CDi ) there is about four different ways to wire it up and all are not giving a stable reading
I was going to scan the wiring diagram and post it up, but i forgot to bring it home

guys
Am I on the wrong track with this thread the Koso one shown is a Speedo and rev counter and I understood the speedo part is fine so surly its set up for DC or it would not work at all. If that's the case your problem sounds like the pick-up for the tacho, I have been looking at various digital Tacho's and most now dont use the induction wrap round type of pick-up. If yours has to be this type I would go down the route of shielding the pick-up wire back to the speedo. Does it respond to revs or is it just not stable?
I don't want to blow your gauge either but have you tried connecting to your green at the ignition switch, that's how the Acewell one works.

It does show revs but jumps about. I think you may have something though about shielding the pick up wire ill pull it away from the rest of the wiring and give that a go. Is there something i can buy to shield it ? a sleeving or something ?

[Monty]

Is there something i can buy to shield it ? a sleeving or something ?
I would be looking round at work as we use a braided copper sleeve that you push together, thread the wire and pull it tight. Its like the wire round your coax TV aerial. Have a search for EFI copper, ebay brings up a good amount of copper self adhesive foil that you could wrap round the wire or I have uses a copper braided solder wick type material before. Wind it round in a loose spiral and Heat shrink it. I would earth it at one end. you could also try a simple clip on Ferrite core, (maplins) Thread the wire through the core a few times
Good luck

[carlos fandango]

Thanks for the help fellas but its still the same i think im going to have to send it back which is a shame because everything else works brilliantly