Re: Hero Impulse ownership experience

Hi viks
please share you experience of after and before Cosworth filter experience effect on FE ,performance and all.

Re: Hero Impulse ownership experience

Performance and sound were simply awesome. Before you realise, the RPM will have climbed to 9K. Freaked the $#it out of few chics in auto rickshaw with the sound. The cosworth filter i installed was a used one, though only for 500 odd kms. It was just bought for testing purposes. Fuel efficiency showed a decline only on the day i was accelerating crazily, red lining on each gear. I got 46 kmpl and the next day i rode at 52 kmph speed and at 4k and 5k RPM. It returned the usual 49kmpl fe.
Worst part is you cannot use it in rains as it may cause water to enter in the carb and may stall the engine.
I used to do 104 kmph at 8k rpm exactly. With cosworth installed, i did 110 kmph at the same 8k rpm, not once, but multiple times.
If you are in mumbai and want to try the filter, let me know. Maybe we can meet up and you can try it on your impulse.

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Re: Hero Impulse ownership experience

Thats a load of BS!!! Gearing remains constant unless to play with the gear ratios or sprockets. If your bike did 104kph @8K RPM then it will always do 104kph @8K RPM no matter you change the intake, exhaust, cam, cylinder, ignition etc. Please verify your claims before you post it in a public forum.

Re: Hero Impulse ownership experience

Lol, come, try it and then post your opinion.
Oh by the way, if thats true, why do people mod their bikes and do get better speeds at same rpm even without changing the sprockets.
Please mind your language, i know a lot such words too, but refrain myself from using them as i like to maintain my standards on a public forum. Do you?

What you are referring to is the gearing ratio, not the speeds.

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Re: Hero Impulse ownership experience

ok excuse the language... But the info you have posted is totally wrong. I suggest you do some reading probably some physics maybe... or a simple google search on RPM and speed will also help. People read stuff like your claims and believe that is true and tell others the same thing.

Now dont get all defensive...


eg. Speed, rpm & acceleration explained - Ninja250Wiki

Re: Hero Impulse ownership experience

Viks, a lot of ppl here may be ignorant. But there are few of us who know basic physics and how an engine or gearing works.

Without changing the gearing(inner or outer sprocket or gear box) u can never achieve a higher speed at the same rpm by changing the air filter or carb or exhaust.


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Re: Hero Impulse ownership experience

Could not find Motul 5100 in 10w 30 grade. Not even shall advance 10w40. Every oil shop owener suggested me to buy 15 w 50 or whatever was available with them. Finally bought honda oil. I did not know that its this difficult to find right grade in populer brands. Any how changed oil but for first 30 kms ride I see no difference. Gear shift is still clunky. Espacelly from ist to 2nd. It usually go to nuteral with a loud sound. Thought oil change will rectifi this problem but it did not. Hero oil was also abailable but I believe hero and honda oil are same only packaging is different.
It dosent feel right and irritates when gear shifting makes noices.

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Re: Hero Impulse ownership experience

Motul 10w30 is readily available here in Mulund in atleast 2 places i know. So is shell advance.

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Re: Hero Impulse ownership experience

Of late this thread has become more of debate forum, talking about filters yes what was posted was partially right in sound and acceleration being improved but other part was wrong about rpm(as rightly pointed out) and yes air filters cant be used in rainy season(which now seems to be longer every passing year) and also drop in fuel efficiency is very steep...

P.S if anyone is wrong about anything please bring it to notice but jara pyaar se mistakes do happen we are humans

My current mobile wallpaper

Re: Hero Impulse ownership experience

hey people

haha it is funny how this is now a debate thread..

about the filters.. are you serious that it can't be used in rains?? i used a K&N on my pulsar for years on all seasons...im no expert but im simply stating my experience with it..

if filters are really as bad as some of the people here are claiming it to be.. what sort of performance upgrades do you recommend? i really feel lag of midrange on this bike

has anybodody had experience with anything like this?

'www.snapdeal.com/product/ffi-fuel-freedom-mpg-mini/1249008'

Re: Hero Impulse ownership experience

On impulse, you need to fit the filter just at the neck of the carb, due to which the filter will be exposed and if it rains, it will take the water inside the carb. You feel the jerks like when you feel if you run out of fuel. Seriously dangerous to the engine. Rain rain go away :banghead:

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Re: Hero Impulse ownership experience

Impulse/FZ/Hunk/Xtreme and Unicorn all share same NGK spark plug CPR8EA -9


above is link for how to decode NGK spark plug model number

If any one has gone through Iridium modification(on any of these bike models) please share Model number and experience

Re: Hero Impulse ownership experience

I believe the 104-118 is possible provded 2 things, Speedo error which is around 10-18% in hero bikes and me being a hero bike owner in the past knows and can confirm on that, secondly if the rider weight is less and does a proper redine with no windblasts than its achievable, if the rider has the GPS on than he would get the accurate speedo. I have used the cosworth filter on My R15 for quiet good amount of kms and i found that there was a mere difference of 0.5 km to 1.3 km difference in all gears, though but i agree to the point that from 104 stock to 118 is something error based.

Please dont be abusive as if your data is right and you really think its achievable, may be gps speed before cosworth and after as i believe all owners here are experienced and know heir bike well.

Are you sure it was a compatible oil and it was designed for 2 wheeler only not for 4 wheelers ?? As i know many people sell car oil to bike customers and customer use it without reading the box properly.
You can use it in rain provided the filter is protected from rains. Maximum 6 out of 10 times if after market filter is used than mid range has actually improved by mere 5% to7% but it comes at a maintenance cost too like cleaning every 1000 kms and other hassles.
Is it NGK normal or NGK iridium you talking about ? As bosch has iridium spark plugs which i am using since last 5000 kms and it is maintanence free spark plug in my case.

Re: Hero Impulse ownership experience

Wasnt 104 to 118, was 104 to 110. Just waiting for the rains to get over, will put the filter again and check and take a video probably

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Re: Hero Impulse ownership experience

IS THE AIR FILTER (K&N) GOING TO BE EXPOSED ? isnt it going to be like in the pulsar?