Sachse advance curve for RGS

Andy

Andy

Hero member
Location
Auckland, roughly
Howdy All,
I recently bought my first real Laverda, after years of just looking, it's an '84 RGS. Only done 20 thou and runs ok but... suffers a few problems that the last owner thought were probably fuel related (he's a mechanic...) but I reckon are down to ignition (I'm an electrician...). So he did everything he could to ensure the fuel system is as good as it can be, like clean and balanced carbs and filters, standard jets and pipes etc, which is great and leaves me to concentrate on the electrical side  ;). Which I am in the process of now, having read this forum and confirmed my suspicion that the ignition needs sorting... So I have a Saches set on its way  :D

So my question is: what curve?

If I read Red right, he says use curve 3 or 4. Can anyone confirm? (preferably Red himself!) Or do I just ride around and see what seems to run best? I use the bike for general road use and touring, sometimes 2 up. I'm hoping to improve the way it runs overall but mostly looking for smoother accelleration off-idle and up through the rev range, especially up to around 3k where it's pretty soggy at the moment.
Cheers, Andy
 
Howdy Andy, 3 is a good curve to start.

do look over the insulation on the wires from the pickup
it seems to me the OE supplier of wiring used for the late 180 and 120 ignition pickups
are the same bunch who supplied wires for volvo, and other auto makers,
which are known for the insulation simply falling off the copper core

if so the quick fix is to scrape it off, clean the copper and slip an appropriate size heat shrink tubing
over the offending wires with a bit of silicone at the pickup so the wires don't touch.

i'm not fond of the way the trigger is fitted with the Sachse so I normally turn the original impulse trigger down, on a lathe, to fit the wheel supplied with the ignition system.  this way when you need to rotate the engine for, say, valve adjustment, you don't chance changing the  ignition timing.

cheers,
Scott
 
I bought a Sachse ignition from Red some time ago [fitted to a 180 S2 Jota], and have left it on 4. I asked for reliability over radical and I'm really quite impressed with it.
Make sure that your earth connection to the frame is clean and I mean sand paper clean, as I was a bit slack with this aspect which gave me a head ache.

Once fitted and set up I haven't had to fiddle with it since, much better than the old bosch system.

HTH
 
Hi Andy,
When we were using the Sachse systems I generally started on 3 and then tried 4 to see if there was a difference, choose whichever ran the cleanest.
Not used a Sachse now for a few years, prefer the Ignitech set up as we can design our own ignition curves and settings

whichever curve you try it will be a big step forward from the original Bosch set up
good luck
Red



 
Hi guys,

Just been playing with curves on Sasha's 81 jota, with full Red motor mukini carbs.  Curve 3 ok but slow to return to idle, curve 4 good idle, no road test yet, but seems to have lower advance mid range, anyone tried 5?

Recovering from a week of sickness so no strength to ride today hopefully ok to go to the races tomorrow

Marty
 
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