It is the Throttle Position Sensor(TPS)..... the Ignition Timing Switcher does not seem to be the old Pulsar magnet and Reed switch type,and bajaj had moved on to the resistive TPS type.
Since you are also into Electronics, try measuring the resistance between ends, it will show 5 K ohms and measuring from any one end to the Center wire will show either 100 ohms or 4.6 K ohms....and when you twist throttle this resistance will vary.

Ok, even I thought it to be TPS at first, but didn't know about these kind of TPS. So, how does it actually senses the throttle positioning? I mean where exactly does it get the throttle input. I have tried tracing the throttle wire, but ends on the carb like normal bikes, sans the reed switch, and it should not be integrated within the carb as well, right? Or is that the from the Carb input is taken and fed ECU/CDI?

Now, coming to AFR. As far as my understanding all 4 strokes carbs have fuel screw. So, turning the screw Clockwise should make the AFR leaner and Anti-Clockwise should make it richer. However, after repeated experiments, it does not show any symptoms of AFR getting leaner when I turn the screw clockwise, infact when I almost tightend screw completely, instead bike stalling:

(1) Engine sustains even at the lowest possible idling.
(2) Sound like too much fuel is being fed.
(3) There's very low difference between COLD and HOT idling RMP (1.1-1.4K).
(4) Silencer sound bassy post 5-6K RPM, and is not free revving.

On the other hand when I start unscrewing the AFR screw, that's ANTI-CLOCKWISE the engine:
(1) Idling RPM starts to decrease, and eventually stalls the bike.
(2) Bike behaves like it's out of breath.
(3) It's more rev friendly, but doesn't accelerate that well.
(4) Silencer sound has more treble.
(5) BUT- Increases low end torque!
(6) Quiet a lot of difference between hot and cold engine in Idle RPM (1.2K to 1.7K)
(6) At more unwinded turns, when the bike comes to reserve, RPM dramatically increases. From normal 1.5K to almost like 3-4K, as if the carb is compensating for the lack of fuel. And automatically comes back to normal the moment I turn the knob to "RESERVE"




I'm really confused about it. I have been adjusting AFR on so many bikes before, but i'm just not getting this. I have been riding the bike with about 1.5 turns unwinded from the completely screwed in position. and the sparkplugs have lot of carbon deposits.

I second most of the symptoms seen by u.
But i have seen this - At more CLOCKWISE turns (> 7 full revolutions), RPM dramatically increases. From normal 1.5K to almost like 3-4K, as if the carb is compensating for the lack of fuel


I am yet to check this out. Actually, scared to open up the plugs.
Hopefully, @Rahulbarik can contribute on this, when he gets his bike...(i'm not supposed to reveal this, but what the hell... @RahulBarik, might give u all the good nwz today...)

I will try to answer your queries with whatever little knowledge i have....
The TPS in the P200NS is like the ones used in KARIZMA, with a continuously variable resistor...So Bajaj had shifted from the Magnet and reed switch type dual Ignition map to a continuously variable one...
As regards the TPS coupling to throttle, the throttle cable is attached to the throttle drum of the carb. This actually rotates the Butterfly valve when the throttle is given. the shaft of the butterfly valve extends to the other side of the carb, where it is slotted for engaging properly into TPS, and with appropriate brackets the TPS is fitted ...



Here is a picture of the HH Karizma carb with TPS in place...


Regarding the AFR screw setting.....Fully Clockwise is lean ..in which state engine will idle, but if you try to accelerate in gear with load bike will struggle to accelerate and may switch off.
When you turn it Anti clockwise more than normal and make the AFR rich, bike will idle at a lower RPM and further adjustment will result in engine switching off due to very rich AFR.
The Spark plug turning black is an indication of rich AFR and the sooty black coating will be dry .
A rich AFR will give you good Low end acceleration, but will bogg down if you try to accelerate rapidly..with a sudden twist of throttle. Gradual acceleration will give very good speed and smooth engine feel.
Try setting the AFR at 3.5 turns anticlockwise after gently turning it clockwise till it stops.This is a good start off setting and adjust the AFR further based on the acceleration and FE you want.
Hope this helps.

Booked myself a yellow NS, and guess what I ll be getting it tomorrow itself, beat that!


Guys is it advisable to switch to Motul 3000 20w50 immediately after 30-50kms?? And keep using that at least until 2000 then switch to Motul 3100 ?

In one day ?? with registration and all ?

i'm been running n stock oil in my pulsar 200ns it odo is 570 waiting for the first service done in monday i'm planning to change the oil to Motul 7100 20W50 in my first service is it advisable to do so...... i like to be my bike smooth in high speeds

is it possible fitting kn filters n pulsar 200ns ...... how abt iridium spark plugs which is time interval to change the filters

Changed to Motul 5100 15w50 in First service... Smoother gear shifts and Engine after 500 kms..
No qualms or niggles till now from my bumblebee.. although I noticed a bassy boooom sound from the exhaust when I let go off the throttle after I cross 5k and once it touches 4k it goes off... I have not ridden the bike much after first service, noticed this sound only after first service... I am not sure what is causing this behavior... is the air filter fitter improperly?... I am not able to trust the SVC guys who say it is normal... Can anyone help me find out what is causing this... Is this normal or should I get something fixed?..

Got the coolant flushed today and refilled with new one, the coolant was fine and there was no mixing with engine oil as well, just the reservoir had that sludge rest was all green and as good as new....

got the second service done today as well, poured motul 7100FS oil and got the carb tuned as well.....

thanx a ton for your help...

Good to know and keep sharing for all of us to learn....
Good luck..Ride safely.

.............

From which showroom are you getting the delivery??/ I am also getting it after 7 days.. registration was over on tuesday... getting delivery tomorrow from Jai Bajaj,Adyar
Lot of engine oil has been recommended here.... Guys from Chennai where can we get Motul brand??/ whether it is available in service center itself??

Yup they said they ll try their best to finish everything up in one day, but will get the bike for sure tomorrow.

I have booked it in Tondiarpet showroom. Yup the engine oil changing is my big confusion too, no one seems to be replying to this query of mine
Since I want to keep my engine as smooth as possible.

I think it is better to use mineral oil till 2500km and after that use semi synthetic motul 3100 upto 5k.... After 5k use Full synthetic