Tune Up

[OscarV]

I recently purchased my 2005 GZ 250. As I do not know if the previous owner kept the maintenance schedule I want to change the oil, oil filter, spark plug, and air filter. Is this going overboard? :??:

[alantf]

I recently purchased my 2005 GZ 250. As I do not know if the previous owner kept the maintenance schedule I want to change the oil, oil filter, spark plug, and air filter. Is this going overboard? :??:

No! By no means! These are things that SHOULD have BEEN done, & if you don't know, SHOULD be done. Go ahead & do them, for your own peace of mind, then you're not wondering?????????? Apart from anything else, the bike should run better. You might also like to run some carb cleaner with the fuel, to clear the carb (the carb is the achilles heel of the GZ) :2tup: :2tup: The air filter might be expensive, so you might want to check/clean it before replacing it, although it depends on the mileage of the bike.

[blaine]

Welcome to the flock.

[Water Warrior 2]

When checking the air filter you have to look inside it. The air actually flows from the inside to the outside. The inside will tell you it's condition. Also you might want to add an inline gas filter between the tank and petcock to stop the crude that makes it past the intank fuel filter. They are cheap, easy to install and are normally clear plastic so you can monitor their condition. You may also want to check the valves before too long. If you can't do it yourself, I didn't, pay a shop to do it. It is only a one hour job after the engine is cooled down. A little TLC will keep your bike happy and you riding.

[blaine]

I recently purchased my 2005 GZ 250. As I do not know if the previous owner kept the maintenance schedule I want to change the oil, oil filter, spark plug, and air filter. Is this going overboard? :??:

The air filter might be expensive, so you might want to check/clean it before replacing it, although it depends on the mileage of the bike.
Here is a air filter that is alot cheaper than stock and just as good.It is listed for a G.S 500. but is a direct bolt in. HIFLO-FILTRO-HAF-3503. Can be bought for around $15.00.

[Water Warrior 2]

HIFLO oil filter is a HF 136. Cheaper than Suzuki OEM.

[Easy Rider]

Here is a air filter that is alot cheaper than stock and just as good.It is listed for a G.S 500. but is a direct bolt in. HIFLO-FILTRO-HAF-3503. Can be bought for around $15.00.

Do you have one? Is it OK ?

Need to be careful with that as the engine design depends on a given restriction in the air input to keep the mixture right. If the restriction is less, it makes the mixture even leaner than it already is and the bike doesn't run well.

For a demo of that effect, try to run it a short way without any filter at all.

[dannylightning]

the day i get a bike, i check every thing out including all cables and any thing else you can think of, i change the oil and all of that good stuff and get out the tool kit and make sure every thing is tight, don't want the handle bars falling off on me lol

[music man]

Here is a air filter that is alot cheaper than stock and just as good.It is listed for a G.S 500. but is a direct bolt in. HIFLO-FILTRO-HAF-3503. Can be bought for around $15.00.

Do you have one? Is it OK ?

Need to be careful with that as the engine design depends on a given restriction in the air input to keep the mixture right. If the restriction is less, it makes the mixture even leaner than it already is and the bike doesn't run well.

For a demo of that effect, try to run it a short way without any filter at all.


We have discussed this air filter many times, I am the one who first introduced it to the site, and I ran them exclusively on the gz, there is no real restriction difference (that I could tell) to speak of with these filters.
The only big difference in them is the mounting plate is metal and not plastic, and it doesn't have that down tube on the inside part of the filter that suzuki puts in theirs, it has a lot throatier sound to it on the intake side because of that, but other than that, the only difference I saw in them was in my wallet.


[EDIT] [Disclaimer] I don't have the GZ anymore, and I can't recall if I had done the needle shim/ fuel mixture screw mod to it before I first tried this air filter or not, so that could be a variable you need to consider if you try this air filter.

[Easy Rider]

The only big difference in them is the mounting plate is metal and not plastic, and it doesn't have that down tube on the inside part of the filter that suzuki puts in theirs,

Tilt.

Can't comment on the end plates ( "mounting" plate?) but I certainly don't remember seeing anything like a "tube" on the stock filter.

Are you talking about air box mods........or is this just a "senior moment".......for one of us ???

:)

[edit] Maybe you are talking about the deflector that the stock filter has on the inlet ??

[bonehead]

I think he is talking about the plastic part that runs about halfway into the inside of the suzi air filter.

[music man]

Down inside the hole of the OEM filter on the gz, the mounting plate all in one piece actually goes down inside the air filter, for what purpose I have no idea, so you can't even look down in there and see but like the last third or so of the inside of the air filter.

[music man]

I think he is talking about the plastic part that runs about halfway into the inside of the suzi air filter.


:2tup:

[Easy Rider]

for what purpose I have no idea,

Ah, THAT piece. I had forgotten about that. :whistle:

It forces the air to flow to the back of the filter......and further restricts the flow a tiny bit.

[dannylightning]

Here is a air filter that is alot cheaper than stock and just as good.It is listed for a G.S 500. but is a direct bolt in. HIFLO-FILTRO-HAF-3503. Can be bought for around $15.00.

Do you have one? Is it OK ?

Need to be careful with that as the engine design depends on a given restriction in the air input to keep the mixture right. If the restriction is less, it makes the mixture even leaner than it already is and the bike doesn't run well.

For a demo of that effect, try to run it a short way without any filter at all.

i changed the pipes on my bike, it ran pretty good after that, than i changed to a k&n air filter, i lost all my torque it leaned the bike out so much, had to order a jet kit and install that, than it was running better than ever. that is on my suzuki volusia not a gz. but the amount of air flow from a air filter can make a world of difference in a good way or a bad way depending no how the bike reacts to it.

[music man]

i changed the pipes on my bike, it ran pretty good after that, than i changed to a k&n air filter, i lost all my torque it leaned the bike out so much, had to order a jet kit and install that, than it was running better than ever. that is on my suzuki volusia not a gz. but the amount of air flow from a air filter can make a world of difference in a good way or a bad way depending no how the bike reacts to it.



A K&N air filter by design has more air flow, so it is expected for a K&N to lean out your mixture on a non fuel injected engine.

I think people get the wrong idea about the Hi-Flo air filters because the name of their company is Hiflofiltro, so people see the "Hi-Flo part and assume that it is a less restrictive air filter.

But you are correct, the amount of air your air filter lets in or doesn't let in, is VERY important.

[dannylightning]

i changed the pipes on my bike, it ran pretty good after that, than i changed to a k&n air filter, i lost all my torque it leaned the bike out so much, had to order a jet kit and install that, than it was running better than ever. that is on my suzuki volusia not a gz. but the amount of air flow from a air filter can make a world of difference in a good way or a bad way depending no how the bike reacts to it.



A K&N air filter by design has more air flow, so it is expected for a K&N to lean out your mixture on a non fuel injected engine.

I think people get the wrong idea about the Hi-Flo air filters because the name of their company is Hiflofiltro, so people see the "Hi-Flo part and assume that it is a less restrictive air filter.

But you are correct, the amount of air your air filter lets in or doesn't let in, is VERY important.

yes, i would have expected something called hiflo to be a much less restrictive filter.

[blaine]

Here is a air filter that is alot cheaper than stock and just as good.It is listed for a G.S 500. but is a direct bolt in. HIFLO-FILTRO-HAF-3503. Can be bought for around $15.00.

Do you have one? Is it OK ?

Need to be careful with that as the engine design depends on a given restriction in the air input to keep the mixture right. If the restriction is less, it makes the mixture even leaner than it already is and the bike doesn't run well.

For a demo of that effect, try to run it a short way without any filter at all.
I have used this filter before & after carb mods worked good both ways.bike will not run right with out filter in,so it must have close to same restriction as original.Only difference I noticed was Intake was a little noiser.