B
Boba
Guest
IIRC there is no difference from the 01 or the 03 model carbs. The MAJOR Differences are between the 00 model and 01, when they introduced the mid-main jet. In 04 I believe is the first year they added the TPS (Throttle position sensor)
The main differences can be seen here. The first page of the thread shows the 89-00 model carbs
http://gstwins.com/gsboard/index.php?topic=56601.0
On the second page are later model 04+
The bowl gaskets are different. The 89-00 have an o-ring on the floats, the later models do not. The later models had the mid-main jet. The tops of the later models don't have individual vacuum ports pointed up (which have an o-ring in them) and instead they point toward each other and join in a t-joint which then point up to a vacuum hose (no o-ring). The inlets (air box side) have different "holes". You'll see in the picture what I'm talking about.
The later models have idle screws with a plastic end which is white the day of manufacturing, the older models are metal. The older model's bowl drain screws point outward whereas the later models pointed toward the center of the bike, making it a bit more of a pain to drain the bowls before servicing.
If I recall correctly from my research, the 01-03 model were a sort of crossbread between the older and newer as far as external identification. The 01-03 have the black diaphragm caps of the older models but they have the joined vacuum instead of the individual vertical pointed vacuum ports. The 01-03 have the white idle screw. They have the outward pointing drain screws like 89-00, but inside the bowl they have 3 jets, pilot, mid-main, and main just like the 04+. The 01 have the intake side of the 04 and up with two little ports on top and two on bottom, whereas the 89-00 has the big crescent shaped port on top. The 01-03 also has no TPS. For an older bike, you don't need the 04+ model carbs because we don't have the need for the TPS so any gs500 carbs 01 and up will do.
I personally would go with 01+ simply because you'd have the mid-main to help properly tune the bike.
Then again, I got a good deal on gs500 carbs which I thought were 89-00 and bought them for a whopping $50. Need a rebuild (which would've happened regardless) but otherwise all screws and bolts were in good condition, if a bit seized from age. After a healthy dose of PB Blaster spraying, letting soak for a day, more PB blasting, another day of soaking, some vice grips to take off some of the stubborn screws that had oxidized a bit making them very stiff (and my lack of JIS screw drivers, using phillips on those JIS screws almost certainly strip them). Come to find out I wasn't paying the least bit of attention to pictures of the ebay add, or when I picked them up in Melbourn (about an hour from me), NOR while I was spraying them down... Turns out they are 04+
Got them open and everything is in very nice condition inside. The only thing I'm wondering is if I can source an o-ring kit and not have to pay $65 for rebuild kits that include float needles and seats that I don't need as mine are in good condition (save the seat o-rings of course).
Big Rich I'm glad you're here because between you and Pete I'm hoping that you know of a good way to go for a rebuild kit that includes o-rings, but doesn't make us pay for the float needles or the float needle seats?
Also big thanks to you and Pete for having your 450 builds written up. Has really helped me with mine. I have the 850 triple tree, gs500 front forks/caliper, waiting on the front wheel, still looking for a bandit 400 rear wheel and associated parts for the brakes. All this plus the aforementioned 04+ carbs for $205 so far. With the bandit 400 wheel and caliper next, I think I'm doing well with keeping money in my pocketsess. After that, all I need to get is the 520 sprocket and chain.
The main differences can be seen here. The first page of the thread shows the 89-00 model carbs
http://gstwins.com/gsboard/index.php?topic=56601.0
On the second page are later model 04+
The bowl gaskets are different. The 89-00 have an o-ring on the floats, the later models do not. The later models had the mid-main jet. The tops of the later models don't have individual vacuum ports pointed up (which have an o-ring in them) and instead they point toward each other and join in a t-joint which then point up to a vacuum hose (no o-ring). The inlets (air box side) have different "holes". You'll see in the picture what I'm talking about.
The later models have idle screws with a plastic end which is white the day of manufacturing, the older models are metal. The older model's bowl drain screws point outward whereas the later models pointed toward the center of the bike, making it a bit more of a pain to drain the bowls before servicing.
If I recall correctly from my research, the 01-03 model were a sort of crossbread between the older and newer as far as external identification. The 01-03 have the black diaphragm caps of the older models but they have the joined vacuum instead of the individual vertical pointed vacuum ports. The 01-03 have the white idle screw. They have the outward pointing drain screws like 89-00, but inside the bowl they have 3 jets, pilot, mid-main, and main just like the 04+. The 01 have the intake side of the 04 and up with two little ports on top and two on bottom, whereas the 89-00 has the big crescent shaped port on top. The 01-03 also has no TPS. For an older bike, you don't need the 04+ model carbs because we don't have the need for the TPS so any gs500 carbs 01 and up will do.
I personally would go with 01+ simply because you'd have the mid-main to help properly tune the bike.
Then again, I got a good deal on gs500 carbs which I thought were 89-00 and bought them for a whopping $50. Need a rebuild (which would've happened regardless) but otherwise all screws and bolts were in good condition, if a bit seized from age. After a healthy dose of PB Blaster spraying, letting soak for a day, more PB blasting, another day of soaking, some vice grips to take off some of the stubborn screws that had oxidized a bit making them very stiff (and my lack of JIS screw drivers, using phillips on those JIS screws almost certainly strip them). Come to find out I wasn't paying the least bit of attention to pictures of the ebay add, or when I picked them up in Melbourn (about an hour from me), NOR while I was spraying them down... Turns out they are 04+
Got them open and everything is in very nice condition inside. The only thing I'm wondering is if I can source an o-ring kit and not have to pay $65 for rebuild kits that include float needles and seats that I don't need as mine are in good condition (save the seat o-rings of course).
Big Rich I'm glad you're here because between you and Pete I'm hoping that you know of a good way to go for a rebuild kit that includes o-rings, but doesn't make us pay for the float needles or the float needle seats?
Also big thanks to you and Pete for having your 450 builds written up. Has really helped me with mine. I have the 850 triple tree, gs500 front forks/caliper, waiting on the front wheel, still looking for a bandit 400 rear wheel and associated parts for the brakes. All this plus the aforementioned 04+ carbs for $205 so far. With the bandit 400 wheel and caliper next, I think I'm doing well with keeping money in my pocketsess. After that, all I need to get is the 520 sprocket and chain.
