how are you. as abhi said that your post is quite confusing but still i will try to answer to the best of my ability.
first of all HP filter is real mess for any bike you can use k&n but then we are living in india not in a country like US where you don't find even a single piece of dirt. as abhi told that the main function of these free flow air filters is to inject more air into the engine than stock filter so as to increase on power. but then it is having one other side too. these filters are to be serviced with their own washing/recharging kits every 2.5k kms. if it's not done it won't prevent dust particles entering into the engine. which is harmful for your engine in all the ways...... the stock filters are the best possible combination of air supply and dust prevention for the bike.
second thing is installing the filter directly to carb would fetch engine make good power than installing filter in hose-pipe/ stock air filter-box. but is more harmful too. in my case i got my carb screwed as well as engine noise increased (to be more precise crank noise increased). i used hp for an year or so and k&n again for an year and half. apart from these tweeks get yourself a good tuned free flow exaust it will not only increse your throttle response but will provide engine better breath-ability and hence less heating problem.
thirdly, yes you can install stock air filter in your bike. it is available in any hero honda authorized spare part shops. or for that matter automobile spare parts shop. try google it for your city.....
and mis firing is one of the best things of cbz i personally would die for that mis-fire
. very less bikes in india we have this.cheers
Jatin


hats off...
as if there are no springs inside the shockups it contracts and almosts hits the T-stem, my question is,has the cone set gone bad due to which i am facing this thud sound??would be really greatful if u guys can share any such familiar experience & the solution for the same.
..u guys meet up at a central location and make it to mumbai,will be thrilling to meet u guys

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