m new joinee, pls forgive me if this problem is already attended in other post

i have a pulsar 180 dtsi 2007 September model. after last servicing my bike is not at all performing.
some times even if I increase throttle of accelerator (on a suitable gear), bike doesn't speeds up and engine makes a noise (similar sound as if I am trying to run the bike at a speed of 40 on gear 2)..
some times bike doesn't at all pick up when i start it from gear 1 and again sound comes if i increase d speed...
also when climbing on the bridges, bike becomes slow as if engine is puting too much effort...
Also from the date of purchase (sept 2007) I never experienced the mileage greater than 35 km/ltr.
I had once tried to speed up d bike at 100 speed ..but as soon as it reached 93, bike stopped (due to heat-up i guess)
Is thr a serious prb wid my bike ? Didn't I get the worst performing pulsar 180??
I had purchased the bike from Khivraj motors,Indira Nagar Bangalore.
I don't know what cud b d problem
pls help



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