GLADIATOR — MISFIRING

I own a Yamaha Gladiator bike and was very proud of having it.
Nearly after 10 months misfiring was there for the bike and I took it to autorised servicing centre.They were not able to solve my problem, did something and asked me to try. I tried, failed and took the bike to the same servicing centre again. This repeated for about 3 times and at the fourth visit they found the problem with ignition coil and replaced it.The problem was solved temporarily but is back now. Again i went to the same sericing centre and they told me that carburator has been clogged and it is cleaned now. They changed the spark plug cap also.Though the interval of misfiring is reduced it is not solved yet. I purchased and i am servicing my bike from SRI MOTORS, 119/1 Jawaharlal Nehru Salai, jafferkhan Pet, Ashok Nagar, Chennai.Although I was proud of my Bike and YAMAHA, I feel pity to have purchased this one. I used to recommend this bike to my friends initially but WILL NEVER DO THE SAME MISTAKE AGAIN.If Yamaha do value customers HELP ME...!!!