Query approved.

is the upjettin done properly?? do not ride with oil less than the required amount.. for ur prob,first try opening the head and replacing the piston rings and the valves.. get the valve mapping done proprly.. this must solve ur prob and try reverting the jet to stock and also try using the stock air box and see..

Yes. The jetting is done properly as i have been riding with the current setup for last 3 years now. the problem has started just recently, say around 6 months back. I understand i have to open up my engine. do u know anyone in pune who can do it properly and not burn my pocket? i am hesistant to give it to someone i dont know.

one word piston ring gone....

u need not open the engine.. all u need to do is -

1.remove the tank
2.remove the carb
3.open ony the head

i.e first open the head cover - this is where u find the taplets,then open the head - this is where u find the valves.. after u have opened this,u'll be able to see the piston... befor this , loose the cam chain tentioner and remove the cam chain form the gear and secure it with some wire..
then remove the cylinder block .. u can then see the piston along with the connecting rod.. just remove the piston from the connecting rod and thoroughly inspect both the piston and the cylinder block walls.. there should not be deep (< 1~2mm ) lines or scratches on either of them..
small scratches which look just like fine lines are ok.. retain all bolts and washers..

since urs is a pulsar and i did all this on a uni myself and on a pulsar 150 by a mech,here goes.. some points may be missin...

now start from the top side of the head,check the rocker arms,the cam gear and the cam chain and replace if necessary.. then goin to the bottom part,after removing everyting,there will be lot of carbon on the head,get it cleaned which they do with some machine in an engg shop.. also at this point,get new valves which have to be put in and they are also put and and " mapped " - which is also done in the same kind of shop.. then replace the pison rings (tell them standard size) and all other required parts along with new oil(castrol active 20w40),put is all together and do a run-in for ~500 kms...also get new plugs - i recommend the ngk platinum g-power for ur bike which r 130/- each.. u can find the part numbers in ngk india website under part search-2 wheelers..
also change all the seals and get the pasted properly with a particular seleant which the mech will know.. they may put grease to seal some stuff,but see that it does not go on the inside..
but if there r deep lines and if the mech says that re-boring is compusary,them get it re-bored.. they may insist on doin reboring even if not necessary to get some money,but ask him why and listen to wat the mech ahs got to say,if it seems like a bluff,the tell him no.. but if it is genuine and if he's able to show u proof like lines,etc then go ahead..

enjoy

i have uploaded the picks of my uni and few of the pulsar engine internals.. hope this will help..
Picasa Web Albums - rohit - bike stuff

and abt the mech -
1. see the shop - it should be big with all the necessary tools and atleast 3ppl..
2.talk to the mech's and see wat they have to say.. u act like u know nothing and listen to what they got to say,if ur convinced and if they look genuine,then go about it.. gat all the spares form bajaj.. will be a day's work and cost approx 1000 including labour till rings replace

good luck

THANKS A ZILLION TIMES!! I know it may sound stupid, But i'l be taking a print out of this before i go in search of a mechanic. This will help a lot and thanks for the pics also.

Lov XBHP and U for this!!