Stock = Factory condition.Stock parts are those which come with the bike when new.

And about my answer: Well you come here and post that your bike doesn't perform well and just post the number of kms done. Everyone assumes you haven't changed the regular parts like the clutch plates, spark plugs, air filter, chain sprocket kit, etc. List all the work done on your bike and we will be able to help you better.

@kaus07: Once try tuning your carb, i feel its running on too lean mixture.

1) The slight rattle that you're referring to is more like a slight clicking, you're right that it's the timing chain. BUT, let me assure you that once you decide to change the timing chain, you're into more trouble than before. You see changing the timing chain is bit of a time-consuming work. Most monkeys who call themselves "Pulsar mechanics" just change the clutch plates and tell you they've changed the timing chain. If your mech is trust-worthy or if you were present when the replacement was done, then comes the problem of the properly set timing. This is part rule, part experience and part art. Most company "foremen" mechanics use the markings on the timing gear to do the setting, but a bike that's run for over 30000 kms, the engine sort of builds a character of it's own. So, it's good to set the timing using the markings and then adjust it by responding to the engine's run.

2) Improperly fit clutch plates will cause lack of acceleration. However, you could be imagining this. MAYBE you expected too much of a change in pick-up and thus you're disappointed. Post your best 0-40 and 0-60 in a thread and request xbhpians with the similar model to post theirs. Then you know for sure. As 'pabi' suggested, it could be a lean mixture prob too.

3) This is linked to problem 1), improper timing will cause undesirable vibrations even when the engine is idling. My guess is that it becomes really uncomfortable after 60km/h in you case.

4) Here is the result of all the problems 1) thru 3). It's like your bike is screaming you to stop.

5) If there's some spilled oil left on the engine, it'll no doubt give out the burning smell. Try giving the bike a body-wash and check again.

Guys,

My Pulsar 150cc 2005 model(UG2)....planning to get my spark plugs changed...which would be the perfect to boost up Performance and throttle...NGK Iridum Spark plugs or Bosch Twin Electrode Spark plugs...

Which would be better and would it bring down my mileage...

never tried Bosch but ngk iridium does the job pretty well ! after installing it i am getting a average of 37 in city and 44 on highways on my zma, although there is slight difference in power, mileage has increased considerably as earlier used to get 32 to 37 on normal plug . i can blindly say go for ngk.

There were a lot of queries and i don't remember which one came from whom so will try and answer all at once.

1) K&n and upjetting is no joke..people who get the perfect upjet in the first attempt are yet to be found on this planet. Every bike (even the same models) behave slightly differently coz of different riding experiences and hence perfect tuning comes only after a lot of trial and error. So low performance is in many cases due to improper tuning. My answer, you wanna get something done perfectly, do it yourself. I followed it for my bike too when i installed K&n and upjetted. Took me 2.5 yrs to get the jetting spot on. Experiment and share here.

2) 45k is a lot of time for an engine. Bike engines can be dragged for a lot of kms but they loose their juice after 40k. No offence. If you want a solution for knocking, de-carbonise your engine..hardly a 250rs job. that will take care of knocking and the rattle and vibrations at 60kmph and the screaming of engine above 80.

3)Regarding the sound from engine that feels like timing chain, those might be the rocker arms. They tend to become noisy in service.

4) The final answer is psychology. We all outgrow our bike's power after a certain time and there starts the low performance problem. This point may not be everyone's case. Again NO offence.

@pavan- I feel none of the 150cc use a manufacturer recommended 20w50 grade. p180 and above do so. People can use 20w50 if they are into continuous high speed riding.

@phanikar- power1 is perfectly fine. U can play with the engine grade if it suits your riding style. 20w40 is a very general grade of oil. power1 is 15w40. Now this 15 must be troubling you. This only means that the engine oil will have better cold starting characteristics.

All engines experience drop in performance with age and the solution is replacement.

hey fayad thanks a ton for the quick reply
even i feel the timing chain is causing all the problem.
the question is shall i visit some service centre for the timing chain.as the mechanic who chnaged my timing chain previously is not at all ready to accept that the timing chain is not been fit properly.i am ready to change
the timing chain once again as the problem are too irritating.
the question what are the things i can do while i change my timing chain or what shall i tell him or the svc guys are smart enough to adjust it according to the k.m,s run?
i have even been told by the mechanic that "thora sound to rahega hi.".is it true?

hmmm i guess i should try this too.thanks a lot....

happen to visit a roadside mechanic yesterday.
told him few problems of pickup n vibrations etc.
he told me he will just open the tank and then do some tappet tuning along with the carb tuning and evrything will be fine....
so what you guys think..shall i go for this and give it a try..????

Is your Silencer perfectly tight and alright?

Always happy to help a fellow Xbhpian!!

Firstly, there's no need to replace the timing chain, if it's new then all it needs is professional tuning. Ask some of your friends for a reasonably good Authorized service centre, tell them that you want the sound to be rectified. IF they're smart enough you'll have a smoother bike that accelerates well.

As for the sound, please be ready to accept a slight yet distinct sound as this is common with almost all Pulsars(even the very well maintained) that have done over 30000kms.

and what you think shall i give it a try for the carb and tappet tuning as the roadside mechanic claimed that he will make the bike smoother etc by tuning all those..any risk factors.what are the things to be checked

for the service i am thinking to go to castrol bikezone..but the thing is wherevr you go the mechanic just claims that i need to change the timing chain...(guess money making policy)...
some mechanics are also bound to change the piston lol..

I'm not so positive about the roadside mechanic, tappet and carb adjustments are pretty sensitive things, both of which when set wrong could result in damage to the piston and cylinder.

Castrol BikeZones are respected by bikers at many places, BUT I went to great lengths to try them once in Chennai and was left completely unimpressed!!!!

Again we should remember that CastrolBZ is a Franchise and much depends on the Franchisee... I suggest you start a thread asking for the best mechanics for P150 in the 'Help Me' section. You're sure to have many Xbhpians from Delhi give you the address to the best technicians they've dealt with.

Just get to some experienced mechanic who has worked with pulsars or get to the service center and tell him to increase the tension or load on scissor gear of the bike .. your noise will go for sure