Request for assistance - 750S with electronic ignition

[Blacklightning]

Evening All,

So looking for some help with a 750 Sport fitted with electronic ignition.

Bike is a recent full restoration from a well known restoration shop, all new and shiny and less than 1500 km on the clock.

Electronic ignition is BC0500006 ELECTRONIC IGNITION 750 R/C Sachse Electronik, Germany.

No ignition problems so far.

I took the bike out on Sunday (well I tried).

About 1 mile to Petrol Station - engine dies as I pulled in - fuelled but could not restart.

Got bike home, no spark on either cylinder.

Looked at battery which had been on a trickle charger, low electrolyte.

Swapped for battery off another bike - healthy spark - bike fired and ran.

Went out, half a mile - bike stopped and refused to restart.

No spark on either cylinder.

Let bike go cold, first kick and it fired and ran. 3 or 4 minutes stationery then stopped.

No spark on either cylinder, would not restart.

So:

Battery now topped up and fully charged (and I had used a battery off another bike too - so battery OK methinks).
I know that electronics can be very sensitive to iffy batteries but whilst I know the battery I first went out with had low electrolyte levels, the battery I swapped it over to was fully topped up, healthy and had taken me out for a run the day before on a 900ss.
Connections to key switch look sound.
Earths sound.
Fuse box clean and polished, took fuses out and cleaned and replaced.
Changed plugs for new ones - no difference.

I think it is therefore something heat related in the electronic ignition but I am not familiar with what tests to do.

Any suggestions?

(I mean to get it fixed, not stuff like put the points back on etc thanks lol ).

Regards

Stuart

[BevHevSteve]

does the battery drain from a full charge to low or dead sitting for a few/several days or does the thing stay fully charged when sitting? (this checks for a drain somewhere).

[Blacklightning]

Hi Steve,

Not sure as I keep it plugged in to a Optimate trickle charger pretty much all the time.

Do you think there is a possibility of an open circuit somewhere leaking to earth?

Regards

Stuart

[BevHevSteve]

unplug the optimate and check if there is

[Peter Mille]

...or ask them:

http://www.elektronik-sachse.de/shopsys ... 528a369d81

[skidstar]

Check your plug caps,they MUST be 5k ohm resistor caps or you can get oscillation in the ignition system.
I had the same problem.,very simple mistake to make.
Ran my bike up on dyno and 4 (on my bike) was best curve,it ran well on 5 but 4 gave another 3hp in mid range and 5hp up top,all other curves were useless.

[1funduc]

The Sachse ignition is sensitive to the quality of the electricity given to it. I had spoke with Volker before he died because I had fried the new ignition on my 750. He stated that the old voltage regulators allow voltage spikes and highly recommended installing a modern voltage regulator. He said he would redesign the curcuits to prevent it happening on the new products but I don't know if he ever got that done before being killed. Great ignition. I've installed them on a number of bevels.

[Peter Mille]

Can you recommend a brand regulator?
I'm still running the original Ducati Elletronica one, together with a new Sachse ignition on my Mille....

[BevHevSteve]

I keep a couple on the shelf, either will work.

https://store.bevelheaven.com/index.php ... =regulator

[Peter Mille]

This is on my Mille, so I guess that's allright with the new Sachse ignition...