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Hey i've an Zma'R model which is 4 months older, previously i've fitted the power filter for much pick-up & then for ecnomic i changed to the default company's filter, now i observe that engine gets more harder & the vibration gets to the handle bar, in earlier befor the with the HH filter it was very smooth but afer the power filter again to the HH filter it get very hard. whether there's any solution for this kind of issue......? 
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