don't take me wrong, first and the foremost i would like to tell you that the red thing under my tank ISN'T the CDI, its just a throttle positioning sensor.
as i told you that it only pops out a piston with the throttle play, and coming to the point where i mentioned that the CDI is 1/4 th of the size of the classic cdi, its based below the seat, near the indicator flasher, as every other bike, and that particular thing is the CDI.
Pictures would clear up things buddy
if in case the thing hanging under my tank (which i call TPS) as you put it as ignition coil, how does it generate spark ??
its a coil as the name suggests, if the magnet doesn't revolve around it HOW will it produce the spark ???????
You need to learn the basics of motorcycle ignition/Hight tension coils.

if its under the tank, magnet rotation is out of question, so where does the ignition part come from ??
Same as above.
the yellow pole out of 8 poles in my current stator is the IGNITION coil, which classic fiero as well as rtr does not have.
so battery is the ONLY source of ignition, as you yourself have put that it needs a DC source to produce the spark, DC cannot be produced without a battery, which literally means that these bikes which don't have an ignition coil (yellow pole in the stator) CANNOT start without the battery, atleast not from the stock stator as it produces only 40v AC (raw) that too without undergoing rectification state, this is not enough to generate a spark.
I have used my bike without battery for nearly 2 years
and as far as your comment of being happy with the CDI is concerned, i asked you the procedure because i want to CONVERT it into TCI, isn't it why all this discussion started at the first place ?
the reason of that explanation was to convey that this is how it works and its not any different so that the TCI has to sense and all.....

and as far as the Fiero (classic) has to find out what rpm it has to change maps in concerned, i really don't think that ever happens, if it did, why would newer generation bikes will have this TPS ??
Fiero is the first indian bike to have digital ignition with 2 curves in india.It has a different stator coil because it switches maps based on the rpm input.Hence ,a fiero's stator coil should never be wound up with a thicker wire as that will misguide the CDI to go for advanced curve or worse.
if we pull out the rtrs here, isn't my bike a fiero ?
if the cdi does change map with rpm, why do they have that red stuff under that tank connected to the throttle ??
So that the rider can be kept happy knowing what curve is running milage or power.
don't take me wrong, i am not arguing here, i am just letting you know how it works as far as my knowledge is concerned, so that i may get to learn a few things if i am wrong, you have been with a fiero much longer and have a good understand of the bike, so i was just letting you know how it is as far as my knowledge is concerned.

and another reason to get this thing done is to get an extra pole in the stator to generate 10+ amps of current in DC and still produce 14v which isn't possible with just 7 poles....

As far as my knowledge goes, ignition in these are CDI...Starting from APACHE 150 the Ignition system have become TCI/IDI...and these can be fitted to the Fieros...Gixxer had done this and he can give better explanation of the plus and minus if any of the TCI/IDI transplant.

There's LOT OF DIFFERENCE between Fiero and F2/FX's digital ignition and electrical system.Starting from the stator coil to the CDI.

My bike can function without a battery in the loop and i have rode it like that for nearly 2 years when it was on CDI.

The apache 150 of my friend's can start and run without a battery when kick starting it or push starting it.If you read the RTR/FI thread there they have learnt the same thing with their bikes too.

Then finally,there's no need to change the stator coil to that of the RTR ,in order to convert fiero to TCI.

CDI does not require battery, in two wheelers. I had started and run an Apache 150 and a RTR with flat battery..so I know that the stator coils are powerful enough to start a DC IDI without battery in these bikes.
what are the Classic Fiero to FX and F2 difference as far as Ignition is concerned ?They are CDI or any one of them is IDI ? Mapping different ignition curves of linear(from stator) or switched(TPS) types ? I am keen to learn and an answer will be appreciated.

I am no technoholik nor do I know in depth knowledge of Engine.

But would like to share my exp that I have run a 1996 model suzuki smaurai without battery for 3 or more days & also my HH Cbz classic without battery for couple of days.

Both the times I had given my battery for charging

First of all let us be clear on the working principle of the two different types of ignitions.
1. The CDI is Capacitor Discharge Ignition.A voltage ranging from 200 to 400 volts AC is generated by the stator YELLOW coil .This is rectified to DC and stored in a small value capacitor in the CDI unit.When the pulse from the pulse coil reaches its peak,this is used as a input trigger to dump the rectified and stored voltage into the primary of a ignition coil by a Silicon Controlled Rectifier(SCR) or Thyristor.This 300 to 400 Volts of DC is stepped up to 18 to 25 Kilo Volts to jump the spark plug gap,thus igniting the Fuel charge inside the combustion Chamber.
2. In TCI/IDI as the name implies it is Transistor Controlled Ignition(TCI) of Inductive Discharge Ignition(IDI).The 12 volts of battery or rectified stator voltage ,with a CURRENT of approximately 2 to 3 amps flows through the Primary of the Ignition coil ,and a Transistor is used to switch this from ON to OFF,depending on the pulse signal from the pulse coil....the spark energy is generated by the inductive nature of the Ignition coil, and hence is called Inductive Discharge Ignition.

So it is obvious that the CDI is voltage oriented and the IDI is current oriented.

The CDI spark is strong but of short duration.( 200 ms typical)

The IDI spark is also strong and of LONGER DURATION(600 to 1200 ms typical).

CDI is good for lighting even a fouled plug,but needs slightly rich AFR.

IDI is good for igniting LEAN AF MIX and for TOTALLY IGNITING the FUEL CHARGE due to its LONG DURATION SPARK...results in more punchy engine response,as compared to CDI.
Hope this helps.

CDI does not require battery, in two wheelers. I had started and run an Apache 150 and a RTR with flat battery..so I know that the stator coils are powerful enough to start a DC IDI without battery in these bikes.
what are the Classic Fiero to FX and F2 difference as far as Ignition is concerned ?They are CDI or any one of them is IDI ? Mapping different ignition curves of linear(from stator) or switched(TPS) types ? I am keen to learn and an answer will be appreciated.

You must have seen the tachometer's needle dancing.

this is the only answer i was looking for, as how does it generate the spark ??

thanks PSR...

Tacho doesn't work if there's no battery, if the battery is very low, even then it doesn't work...

@ gixxer

alright, you win, your CDI works with stator's input to detect what rpm the bike is running, i am wrong from the first post itself..
and you were right even when you mentioned that if a fiero stator is winded with a fatter wire it can change the mappings and do even worse, you were always right my friend.

i won't post any more queries in this thread henceforth, if asked for an answer from me only then I'll put up my posts here...

thanks for taking the pain of finding the rtr's stator cost for me, and for helping me with other queries too....

goodbye.