pulsar bike -white smoke

[irfanpuls]

Hi guys i recently bought a pulsar 2007 model 150cc (2nd hand )bike in chennai everything was fine untill i gave it to service and then later it has started giving a lot of smoke with burning smell when i took it to service station they told me bore is weak so it has to be replaced which costs me 8k. My friend suggested me to change the airfilter and smoke wont come. I m confused wat to do surely i cant afford for 8k please suggest me wat to do and ya the bike has run 30000kms please help me ASAP

[RhynoCZ]

Please, use dedicated section of this forum for your post.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Rogerborg]

Check the oil level, it may have been over filled. It could be blowing past the piston rings, or being sucked up the crankcase vent into the airbox.
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[irfanpuls]

The level of bike oil is normal and recently i found rpm clocking 8000rpm for a speed of 50kmph m worried now its constantly smoking in huge amount whenever i throttle a little too please suggest me a measure ASAP i m getting tensed after watching that amount of smoke for such a lil throttle