860GT ignition timing
Posted: Mon Sep 17, 2018 8:38 am
Gentlemen,
Please forgive me if I am re-stating the obvious:
The original 860GT ignition is crankshaft-triggered to a stationary pickup, unlike a typical cam-triggered engine, where the camshaft drives the distributor, thus gets a trigger on every rotation of the crankshaft, whereas the cam-triggered engine only gets one trigger for every two rotation of the crankshaft.
Crank-triggered engines will get a spark pulse on the exhaust cycle in addition to the "working" pulse on the compression stroke, not that unusual an occurrence in motorcycle engines.
As I have installed a Sachse ignition to replace the defunct OEM unit, I am assuming that the Sachse will perform the same way, unless it has a "divide-by-two" counter in it, which would make it necessary to find the place where all the camshaft dots on both cylinders are aligned.
Am I mistaken in my understanding of the second spark on my 860GT engine?
Thanks in advance.
Regards,
Richard
Please forgive me if I am re-stating the obvious:
The original 860GT ignition is crankshaft-triggered to a stationary pickup, unlike a typical cam-triggered engine, where the camshaft drives the distributor, thus gets a trigger on every rotation of the crankshaft, whereas the cam-triggered engine only gets one trigger for every two rotation of the crankshaft.
Crank-triggered engines will get a spark pulse on the exhaust cycle in addition to the "working" pulse on the compression stroke, not that unusual an occurrence in motorcycle engines.
As I have installed a Sachse ignition to replace the defunct OEM unit, I am assuming that the Sachse will perform the same way, unless it has a "divide-by-two" counter in it, which would make it necessary to find the place where all the camshaft dots on both cylinders are aligned.
Am I mistaken in my understanding of the second spark on my 860GT engine?
Thanks in advance.
Regards,
Richard