Replacing Intake/box with aftermarket filters.

[Kcarvajal]

Is it possible to do on the GZ250 without too much other mods? Just curious if there are any gotcha's, etc.

Thanks!

Ken

[blaine]

Is it possible to do on the GZ250 without too much other mods? Just curious if there are any gotcha's, etc.

Thanks!

Ken
I assume you mean pod filters.It can be done,but will gain you nothing,and are a pain in the rain.You would need to rejet at the very least.When I done modifications to my bike,I used the stock air box with a after market filter.It flows more air,and is about a 1/3 of the price of a oem one.
HIFLO-FILTRO HAF-3503 air filter
HF-136 oil filter
This filter is listed for the GS 500 but is a direct fit,
:) :cool:

[Kcarvajal]

Blaine,

Thanks! It will be positioned where the box currently exists.

I wanted to re-arrange the electrical and battery placement. It seems like i would gain space by doing so.

My bike has been rejetted, according to the previous owner anyway when he installed the cusom exhaust. I think I'll tinker with it and see.

Thanks again!

[jonathan180iq]

If he rejetted for exhaust, you will still have to rejet when you change the intake. The intake is far more restrictive than the exhaust.

[geezer]

ever tried looking for light through the gz muffler? there aint none! exhaust is def the ost restrictive

[Kcarvajal]

Ok, a risk and more work than it's worth.

Thanks!
Ken

[mole2]

ever tried looking for light through the gz muffler? there aint none! exhaust is def the ost restrictive

The thing you have to rejet for is when you get more air into the engine. If you modify the air intake then you must rejet. You don't have to rejet with most exhaust systems.


:)

[geezer]

why is it no one seems to understand if you mess with exhaust it alters the amount of air the engine can injest, just like messing with the intake. they go hand in hand. mess with either one and you must undermost circumstances rejet!! ill bet you all money on this i swear. if you can get more air out, you can get more air in, common principle. engine = airpump.

[jonathan180iq]

why is it no one seems to understand if you mess with exhaust it alters the amount of air the engine can injest, just like messing with the intake. they go hand in hand. mess with either one and you must undermost circumstances rejet!! ill bet you all money on this i swear. if you can get more air out, you can get more air in, common principle. engine = airpump.

Correct. But to reference your previous comment as well, of the two, the exhaust can handle more flow in its stock form than the intake can.

Switching from a restrictive factory air box system to the very open flow of a pod filter is a more drastic change than simply replacing the factory exhaust. That's why, unless you are placing the headers, the muffler part of an exhaust is simply called a slip-on and often times doesn't require a rejet. However, as you said, every bike is different and giving a blanket answer doesn't cover the hiccups that some people will run into.

[blaine]

Switching from a restrictive factory air box system to the very open flow of a pod filter is a more drastic change than simply replacing the factory exhaust.
Also changing from a factory filter to a aftermarket filter is much less drastic than switching to a open pod filter.
:) :cool:

[jonathan180iq]

Also changing from a factory filter to a aftermarket filter is much less drastic than switching to a open pod filter.
:) :cool:

Ineed.

[geezer]

jon where do you get your info? you had a gz on the dyno to compare intake to exhaust? lol cmon man, maybe im being alittle to simple minded here but for the intake you have a carb throat and a few inches of diameter ruber boot to the airbox. then ther is a filter. i had the muffler off my bike and you cannot see even a hint of light shine through it.

[jonathan180iq]

Which causes the larger problem?

(A) pin hole in your intake system

(B) 1/4" hole in your muffler?

If you chose (B), you are incorrect.
The very fact that the intake tract is so small and precise, as you mentioned, means that any changes to this part of the system results in exponentially larger change to the bike as a whole. The exhaust system, in contrast, is designed to operate under a wider range of scenarios and thus, can handle more variables than the intake system.

As I said before, if you had a lot of experience dealing with motorcycle exhaust systems, you would know that there is a difference between factory exhausts and aftermarket exhausts and that difference does not come primarily from the muffler. Mufflers are little more than sound suppressors. It is through increased header diameters and flow capabailities that the largest differences occur. THAT is why many slip-on muffler manufacturers will quote on their boxes that slip-on mufflers may not require a re-jet. You will not find a full system manufacturer that will make that statement. And it has nothing to do with being able to see light through the end of the muffler. (Ever look through the end of a flowmaster? (Varies depending on model) Can't see light there either. How about a set of Cobra drag pipes? No light.) Even the high end mufflers all filled with baffles and angled pieces and insulation to direct air flow so that a certain tone is achieved.

Cutting off your head pipes and slapping on universal fit muffler is, in essence, simply creating your own slip-on. And it may very well require a slight rejet. But it will need much less work than if you make even a slight change to the intake system.

Do it. I promise you will experience the same thing.

[geezer]

so your basis for arguement is the intake ha a more dramtic affect on things due to the size of a hole thats not there? fine i give up

[alantf]

i had the muffler off my bike and you cannot see even a hint of light shine through it.

Muffler plus pipe = curved.
light travels in straight lines.
That's why you can't see through it.
Q.E.D.

:crackup :redflip:

[geezer]

yeah no duh alan!! damn you! i still cant belive thsi guy thinkbecous a hole in the intake is worse than a hole in the exhaust that makes it more restrictive. ever stop to consider that its not just air going throu the intake? fuel metering is why the intake has to be perfect and you can get away with a huge hole in the exhaust. and besides i hope your not basing all your "info" on the gz.

[blaine]

fuel metering is why the intake has to be perfect and you can get away with a huge hole in the exhaust.
That is exactly the point jonathan was trying to make. :??: O_o
Quote:
Which causes the larger problem?

(A) pin hole in your intake system

(B) 1/4" hole in your muffler?

If you chose (B), you are incorrect. :)

[geezer]

nope, i was talking about what part of the bike is more restrictive and he goes and tells me about holes and stuff. NEXT

[blaine]

nope, i was talking about what part of the bike is more restrictive and he goes and tells me about holes and stuff. NEXT
geezer wrote:
fuel metering is why the intake has to be perfect and you can get away with a huge hole in the exhaust.

jonathan stated it,you wrote it,and I agree. :) :cool:

[geezer]

YUP you got it! but i was explaining thats probably why the intake is so much more effected by holes in it, another side of the arguement completely.

[Water Warrior 2]

I think that Jonathan was trying to say that a pin hole in the intake will alter the engine running more than a hole in the exhaust system. Even a pin hole can upset fuel metering and cause issues to an otherwise fine running bike. My own personal solution is to leave it alone. Suzuki pays some pretty smart folks a reasonable rate for making things work over a wide range of operating conditions. Bone stock the GZ is a fine bike. Lynda had zero issues riding bone stock and the bike proved it's worth in all weather conditions encountered. I know a lot of owners want to change the bike's appearance or whatever but I stick the idea if it ain't broke don't fix it. Been there done that. I'd rather ride than tinker.