aftermarket vs OEM air filter

[jh4016]

I just picked me up a 2002 fz1 with about 25,000 miles on it the air filter is pretty dirty so after blowing it out i am considering replacing it. What would be the difference between getting an aftermarket and something lika a K&N? at twice the cost I'm wondering if it's worth it after dropping $3300 on the bike

[eflyguy]

Not unless you plan on many other mods..
..a

[jh4016]

it has a yoshi slip on and I would guess by the power delivery, it's been jetted. After I recover from the cost I may mod it, but as it is my daily driver (sometimes with a passenger) I have an appointment with a custom seat maker, I would like a slightly taller windscreen, and I need locking luggage...prob go with a trunk for cost reasons

[eflyguy]

If it runs right with the stock filter, simply switching to a K&N will likely mess up the mixture. You'd need to re-jet.
..a

[ReconViper1]

Originally Posted by eflyguy

If it runs right with the stock filter, simply switching to a K&N will likely mess up the mixture. You'd need to re-jet.
..a

How is that?

Reduced airflow requires mix to be leaned out? Airflow so radically improved that stock mix settings must be enriched to provide an equivalent mix ratio?

A friend of mine has a re-jetted, but relatively stock 2005 with an aftermarket high performance can, and it doesn't run well at all at lower rpm's and the mileage sucks.

It's just an impression but it seems like if you increase your tire pressure, you must re-jet and if you drive by a Harley going in the opposite direction, you must re-jet.

If the airflow on an FZ1 is so critical that it must be re-jetted for relatively minor reasons, how do we deal with changes in atmospheric pressure on a daily basis?

One thing is for sure, Yamaha engineers are pretty dumb and need to log on here to come up to speed.

[stretch160]

K&N has no effect on airflow in the stock airbox. because it is reuseable it may save some money down the road.

[eflyguy]

Originally Posted by ReconViper1

How is that?

Reduced airflow requires mix to be leaned out? Airflow so radically improved that stock mix settings must be enriched to provide an equivalent mix ratio?

A friend of mine has a re-jetted, but relatively stock 2005 with an aftermarket high performance can, and it doesn't run well at all at lower rpm's and the mileage sucks.

I'm basing it on feedback and comments regarding rejetting and people having to switch back to a stock filter as the bike did not run right with a K&N. K&N is not a 'minor' modification, it significantly increases airflow.

I could be completely wrong, however, which is why I said 'likely'. Perhaps I should say "possibly"..
..a

[stretch160]

Originally Posted by eflyguy

I'm basing it on feedback and comments regarding rejetting and people having to switch back to a stock filter as the bike did not run right with a K&N. K&N is not a 'minor' modification, it significantly increases airflow.

I could be completely wrong, however, which is why I said 'likely'. Perhaps I should say "possibly"..
..a

at least for my gen 1, there was no change and no need to rejet.

[bonesFZ1]

I would think you would want the best air filter you can get. It is where your engines starts its breathing. The aftermarket ones are made of much better materials and constuction. I noticed a big difference when I cleaned mine out (BMC) and reoiled it. ( not to mention the performance I got from doing the airbox mod)., Those aftermarket ones last pretty much forever if you maintane them. My humble opinion.

[jh4016]

What airbox mod? And did it affect your milage? I like 44mpg

[abe57]

Originally Posted by jh4016

What airbox mod? And did it affect your milage? I like 44mpg

I have a Mivv can,Dale's StageII with pods and Dale's ignition advancer and one down on the front and two up on the rear sprockets and checked it yesterday and I am still getting 39~40mpg !!! With a great running bike to boot !!!

[bonesFZ1]

I have a Gen 2

[Sammax]

I am debating going after market just because they are washable. K&N shows all the car part places around me (O'reillys, Advanced, maybe Autozone) are authorized dealers. May see what kinda price I can get from one of them.

[Wlfman]

Originally Posted by Sammax

I am debating going after market just because they are washable. K&N shows all the car part places around me (O'reillys, Advanced, maybe Autozone) are authorized dealers. May see what kinda price I can get from one of them.

Amazon.com best price for K&N filters....

[eflyguy]

Highly unlikely they'll carry the one you need.
..a

[Sammax]

yeah I don't think it's something they will stock but can order.

[-Dash-]

You know why K&Ns flow alot more air? Cause their full of holes. Doubt me? Hold one up to the sun and start singing:

"twinkle, twinkle, little star....."

[dingbat]

I've run a K&N and a slip-on with stock jetting on my '03 at 400'-1400'. Waaaay lean.

[WDD]

I'd go with OEM.

The engineers at Yamaha did a great job in building a nice, bullet proof engine. A lot of work went into designing the air box to work with the OEM filter to provide the correct pressure waves to feed the engine.

If the K&N provides more air, then your bike will run lean. That is why you'll need to adjust your jetting to accommodate it.

IMHO - given you'll replace the air filter maybe 2 or 3 times for the entire life of the motorcycle, it will be hard to get back the money for paying 2X the amount of an OEM filter for a K&N - plus whatever you'll need to do to adjust the carbs.

Sounds like your bike was ridden hard. I would put my $ first on servicing / revalving and re springing the shock, servicing and re springing the forks. Then check the valves. I'd flush the coolant, replace the brake fluid, drop the swing arm and put in new grease, pull and clean the EXUP, etc. Inspect your chain and sprockets. How old and worn are the tires?

THEN I'd focus on the taller windshield, luggage racks, etc.

[rmzalbar]

Originally Posted by WDD

Sounds like your bike was ridden hard. I would put my $ first on servicing / revalving and re springing the shock, servicing and re springing the forks. Then check the valves.

Please excuse me butting in with a question, as my situation is similar to OP, just bought '02 with 22k miles - I rebuilt my front forks to take care of seals, bushings, pitting, and ancient fork oil. Do the springs and valving themselves go bad with age too? I didn't do anything there (except thoroughly clean.)

Put 3000-mile R6 shock on, so rear not an issue. Thanks!