Ok. That too makes sense. I did not see the pulsar was mounted to the stator plate on the Mina type engine.
I messed around a LOT w/ timing curves in the ZX. Both having Sutai program an OEM cdi, and programing my own in the HPI cdi.
There is something just like the air/fuel ratio that applies to Ign. timing. Unfortunately I forget the formula.
It is based on flame front travel/A/F ratio/compression ratio, and compression pressure.
These all combine to create the Exhuast gas Temp. so the reason I forgot the formula is I have been using an exhaust gas temp gauge (on my 2t)
Something like if the timing is too far retarded, all the heat, and the expanding gasses dump into the pipe, and power is wasted.
If timing is too far advanced all the heat is kept in the cylinder, and the expanding gasses actually slow down the rotation.
Imagine spinning a ten ton wheel with a hand crank. At first you need to apply power all thru the revolution. That can be related to advanced timing.
As the wheel gains momentum, you only need to apply power toward part of the revolution, allowing momentum to continue the cycle.
That's why timing curves start out w/ more advance. The power needs to start sooner. As the rpm increases you retard the timing so as not to interfere w/ the momentum. Just a little "kick" at the top of the cycle is all that is needed to maintain,BUT you still need to allow for the flame front to expand Inside the cylinder or that spark cycle is wasted, and the power dumps.
Something like that...
Customer ready engines are tuned to run well thru all conditions that can reasonably be expected. Therefore they are "mildly" timed. All of our scooters will respond Very well to re-programing the Ign curves to suit our style/needs.
In Kymcos' the only option is changing the advance. Nothing can be done about the curve UNLESS you contact Sutai. They will program any curve you want (NO WARRANTY) in a custom cdi.
Unfortunately there is no way to know how your bike will respond except for trial, and error.
That's where after-market Ign systems shine. It's too bad most people don't want to plop down 5-600.00 bucks to try them.
In the long run a custom timing curve will save money on fuel, and engine life. Not too many see this aspect.