South West Bikers | Motorcycle Forum

Hey people

I have a ZXR400L, stock header pipes and blueflame evo can, stock airbox. I've been looking at getting a stage 1 K&N filter, they advertise better airflow to the engine to allow it to breathe better, smoother running, better throttle response and a small power increase of up to 5%.

Do any of you guys and girls have a K&N filters and can you notice any difference??

Is it worth the £47 + p&p??

Many Thanks

Lee

I dont think it would make much of a difference to the ZXR-400 I could be wrong though.
It's just the way the air has to flow through the airbox makes it difficult to flow anyway so I can't see a K&N making much difference will probably make a minimal difference though

I cant say I've ever noticed a huge improvement, They should improve performance with a racaecan but in the long run they can save money since they can be cleaned, £10 cleaning kit and you dont have to replacement them every 10k miles etc

Thanks for the replies, well maybe make it a job for next year along with a new full micron exhaust system.

Cheers

Lee

I don't know, fiddle fiddle fiddle. Why do manufacturers spend thousands on research when when they could just buy cheap aftermarket parts to make the bikes faster. Granted that exhausts are kept quiet so fitting a race can can give a few more bhp, but these are finely tuned machines and unless you know what you are doing it can all end in an expensive engine rebuild. sigh
Older bikes can be fiddled with because development has moved on, but messing with filters and exhausts also means fiddling with jets unless you want your bike to run lean and burn holes in pistons etc.

You don't need to re jet or fit open filters when fitting after market pipes.
but to get the best results re jet and spend some money on some dyno time

I had my CBR6 dyno jetted and K&n air filter fitted and it made the flat spot at around 5500 rpm go away and it pulled like feck all the way so yes it is worth it in my opinion

Jay

The mid-range improved loads on my ZXR-400 with an akrapovic can, it's not staying on there long though

AKRAPOVIC CAN!! I've been wanting one for mine ZXR for ages. How you find one to fit? You get a slip on one and modified your downpipes or have aftermarket downpipes?

You have any good pictures??

Thanks

Lee

Avoid messing with the airbox, it can be a total [bar steward] to get the engine to run right after. Messing with the carbs is a reall bugger!

Stick to the new airfilter and loud can as they can be easily made to work on stock jets n needles.

Hacking the airbox or pods=new jets, needles and big headache lol

On a 400 sports bike, fitting a decent can and/or full system, is going to make the engine run lean/hot...

So before you do anything, need to use next size up on the jets...

However to take full advantage of the extra flow that can/pipe gives you, more advanced jetting changes with a K&N stage 1 filter can really make the difference...

I've got aftermarket cans on my TL, fitted K&N, and she will be shortly off to TTS to have the ECU re-programmed

If ya need any more detailed info let me know ;)

try turning your pilot screws 1/4 turn richer, and if the needles are adjustable raise the needles by moving the clip down one notch.

Make it run a little richer and take advantage of the new free breathing.

A stage one dynojet kit would do it wonders also.