Changing Air Filter

[kori]

Originally Posted by blaine

You should shim the needle.I bet your running lean in the mid-range.

so shim.
got it.

question- how much?

also ever read that moving the existing washer is a way of doing it but i imagine that doesnt raise the needle like i need.

[blaine]

Originally Posted by kori

so shim.
got it.

question- how much?

also ever read that moving the existing washer is a way of doing it but i imagine that doesnt raise the needle like i need.

Yes it does.When you follow the instructions & see it when you take it apart.It will become clear.
http://www.gz250bike.com/forum/showthread.php?t=16

[kori]

thats the post im talking about.


blaine after the needle adjustment, that's letting in more air to the mixture, correct?

if that is so, will i have to re-adjust the pilot? say screw it in all the way and back it out maybe half(1.25) of what i have at the moment(2.5)

thank you in advanced for the rapid replies. ive had this gz for awhile and stumbled upon this website lately. its revived my interest in the little thing. before it just sat in my backyard under a tarp. :o:o

[blaine]

Originally Posted by kori

thats the post im talking about.


blaine after the needle adjustment, that's letting in more air to the mixture, correct?

if that is so, will i have to re-adjust the pilot? say screw it in all the way and back it out maybe half(1.25) of what i have at the moment(2.5)

thank you in advanced for the rapid replies. ive had this gz for awhile and stumbled upon this website lately. its revived my interest in the little thing. before it just sat in my backyard under a tarp. :o:o

Raising the needle lets in more fuel.The needle controls mid-range,the pilot controls idle to 1/4 throttle.You need to adjust pilot also.You need to adjust it with the bike running warmed up.Adjust to were the bike idles fastest & smoothest.Your at 2.5.Turn out (rich) slowly you will hear the bike speed up.When the bike starts to stumble back in till idle is smooth.

[kori]

pilot jet is inside the float bowl of the carb.
this is what you are referring to right?

the air/fuel mixture is the one on the outside of the bowl that i drilled the cap out of. is this the one you mean? not quite sure how i would adjust the pilot while running.

[blaine]

Originally Posted by kori

pilot jet is inside the float bowl of the carb.
this is what you are referring to right?

the air/fuel mixture is the one on the outside of the bowl that i drilled the cap out of. is this the one you mean? not quite sure how i would adjust the pilot while running.

Pilot jet & air/fuel mixture are the same thing.(the one you drilled the cap off)

[kori]

oh ok.

i will try the new adjustments after work tomorrow hopefully. its supposed to be freezing here so i dont really no how great the tune will be. hopefully with the needle mod i get this old thing running a little more pep in its step.

[blaine]

Originally Posted by kori

oh ok.

i will try the new adjustments after work tomorrow hopefully. its supposed to be freezing here so i dont really no how great the tune will be. hopefully with the needle mod i get this old thing running a little more pep in its step.

With the pilot jet (idle mixture) adjusted (richer),you will find that the bike will start easier cold.Less choke needed.

[alantf]

North America must be the only country in the world that legislates for vehicles that won't run at their best , from the factory. Every other country lets the manufacturers set up the vehicles for maximum efficiency. I've never had to touch the carb on my European GZ. :mad:

[blaine]

Originally Posted by alantf

North America must be the only country in the world that legislates for vehicles that won't run at their best , from the factory. Every other country lets the manufacturers set up the vehicles for maximum efficiency. I've never had to touch the carb on my European GZ. :mad:

Yep.....Set to the point that they are so lean that they will not start well in the cold.