Suzuki: Smell from exhaust, maruti suzuki, suzuki 800

Question
I have a maruti suzuki 800 with MPFI, run aprox 70000 KM, the mileage is OK, Its smelling from the exhaust  and also the RPM "which used to be higher in the starting and come down after some time" this phenomena is not the same and is low on RPM in the starting. Should I service MPFI assembly or clean the injectors or clean the spark plugs, please suggest.

Answer
Usually a smell from the exhaust is an indication that the mixture is incorrect, and the converter is unable to successfully change all the mixture. It could be a misadjustment, or a part no longter functioning correctly.  I don't have enough concrete data, nor access to the appropriate service manual to advise you properly.
Were you to acquire the manual, you would then be able to diagnose and repair it.  I cannot strongly enough suggest that you purchase the appropriate manual from Suzuki.
scotty