Impedance of BTZ pickups?

1200 JOTA

1200 JOTA

Senior member
Location
Australia
I'm still sorting the 1200 .. and wondering if anyone has measured the impedance of the their original (metal case) ignition pickups?
My 180 triple is a '77 (78) and I think is stock Bosch - the pickups came out at 57 ohms & 58 ohms which is far from the 220 ohms or so I get from the Ducati which is a similar but not identical setup. Because they're so close I suspect that 57/58 is correct. Anyone got specs.?
 
Just going from memory here, so I could be wrong. But I think your measurement of around 57 Ohms is about right for the Laverda pickups.

I also have a vague memory that the pickups on my Ducati MHR are around 200 Ohms, so that sounds about right too.

While both bikes use variable reluctance type pickups, they don't necessarily have the same resistance. Basically a VR sensor is a coil wrapped around a permanent magnet. Their resistance is dependent on the thickness and length of wire that makes up the coil. It can be anything from a few Ohms to maybe 1000 Ohms.

PS: I just looked in the workshop manual and it says to test the pickups with a "circuit tester" but doesn't give any clue as to the resistance.
Also checked the green book, and couldn't find any info there either.
JLO's Laverdamania site says the resistance should be less than 100 Ohms.
 
thanks .. 2 very good references

it seems that there is strong opinion against the original ignition setup .. starting with the VR pickups, so maybe the right way to go is look at the modern alternatives

my ride definitely needs some attention - idle is not too bad (but need to keep it under 1000 to get it into gear or find neutral) poor off idle pick-up (not good in traffic) and pulls well up until 1/2 throttle (but then smothers itself under load) (mikunis) (3/1 exhaust) it will red-line but it definitely needs a tweak

still a joy to ride but it's time to invest a few dollars ... I don't think tweaks alone will work!
 
Nowt wrong with the OE pick-ups, they're still working reliably with a DMC in my 3C.  They are one of the very few bits left from the original bike...  Apart from their wiring, they are just about bullet-proof imho.

Resistance is typically between 50-60 ohms.

piet
 
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