Carbs removal GV250 2004/5
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Help! This bike has been unused for about 8 years. Needless to say, it will not start! Sparks are good, so must be fuel. Took out carb drain plugs – no fuel. I need to get carbs out, I think, to clean, but can
t get the air box out. Also, cant get to the screws under the carbs to release them. Do I need to undo the stubs from the heads? Any help and advice welcome. -
Welcome!
Take a look at this topic i created (I will add pictures soon, next time i work on a customer GV bike) , let us know if the link below helps?
[Tutorial] How to Remove & Re-Install the GV125 Carby | GV250 AirBox
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Welcome! Take a look at this topic i created (I will add pictures soon, next time i work on a customer GV bike) , let us know if the link below helps?
[Tutorial] How to Remove and Re-Install the GV125/GV250 Airbox
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Hi Marcel. Thank you for the replies to my questions. Very helpful.
I have one anomaly with my carbs – the back one has a main jet 87.5, and the front 90!! Reading all the articles I can on your site, it seems it should be the other way round. Should I just leave the 90 in the front and buy a new jet for the rear, and if so, what size?
Secondly, I wont do anything unless I can get the black tar and gunk out. The carbs are a mess! Can you suggest a dissolver that might work? I will try to find somewhere with an ultrasonic bath but don`t know if that would work.
Thank you again for your help.
Mike
Hey mike,
if you had seen the Jetting tutorial, you will be okay to use 92.5 front and 95 rear.
87.5 is very lean for the 250 but it was done by Korea as some countries have emission laws for imported bikes.
In my opinion, the bikes should be 92.5 and 95 because a factory made GT250 uses those jets straight of the factory.However, make sure mixture is 2.5 full turns out from closed on both carbs. Never touch this ever again forever (regardless of bike’s mood or engine woes)
Factory mix is usually around 3 turns.Do you know anyone locally that fixes bikes ? They should have an ultrasonic bath machine and they will do it for you, it usually works unless there is serious rust on one of the carb parts inside the body.
If its just black goo , tar, it will usually come away eventually , consensus is that we tend to clean the carbs hard twice with a sonic bath , and finally an air compressor (as per service manual)
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Thanks Marcel. I know you have mentioned Blue coloured web sites in other posts, but I have been looking at hyosungcatalog.com and they say they are supplying original parts directly from Hyosung Korea. Any thoughts on that? Their parts list shows a different part number for front and rear needle jet. Are they therefore different sizes? Can you supply the front one with the securing “acorn” bolt, and the 92.5 and 95 main jets? Your carb overhaul kit doesn’t show the moving fuel valve bits, I assume they come with the bodies?
Lastly you mention altering the idle screws. I am not changing the plugs or leads at the moment (need to make sure I can start the bike first!), so does your suggestion still hold?
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Even the australians discourage new members on facebook from using such sites , i do not recommend them as they are just wishy-washy. Honestly , there isn’t much i can’t get. If my oldest UK hyosung dealer (what is local to me) or Sinnis UK or MotoGB UK can’t get it from KR Motors Korea , best believe Korea isn’t making such part or they have suspended production temporarily. It is true some random websites out there might have stock for certain parts , it might just be old stock they bought up.
It’s not just blue/white sites being a scam, some of they do actually ship products but they take months or customer gets wrong parts in the boxes. I get told this all the time. I was approached by one of the sites to do business , i said no.Email me a proper list of parts so that i can see what i can do for you.
The carb rebuild kit includes the “float seat , float seat screw , float seat plunger tip”
Black floats are in stock and sold separate on the site shop , even the Needle for slides or NEEDLE JETS (where slide needle goes in , and has acorn nut on the other end etc) – I try to put as much of the common carb parts on the site as possible, if something is missing i will get it for you or advise accordingly , i will look out for your email.
Do not worry about idle mixtures, once you put the Size 20 Pilot Jets & Upgraded Main Jets ===> Set it to 2.5 full turns out from closed stop, then this is a setting forever.
The “STARTING JET” (the jet that can’t be removed inside carb body) is what will start the bike first.
This video is 100% our carb but imagine upside down 😉
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Even the australians discourage new members on facebook from using such sites , i do not recommend them as they are just wishy-washy. Honestly , there isn’t much i can’t get. If my oldest UK hyosung dealer (what is local to me) or Sinnis UK or MotoGB UK can’t get it from KR Motors Korea , best believe Korea isn’t making such part or they have suspended production temporarily. It is true some random websites out there might have stock for certain parts , it might just be old stock they bought up. It’s not just blue/white sites being a scam, some of they do actually ship products but they take months or customer gets wrong parts in the boxes. I get told this all the time. I was approached by one of the sites to do business , i said no. Email me a proper list of parts so that i can see what i can do for you. The carb rebuild kit includes the “float seat , float seat screw , float seat plunger tip” Black floats are in stock and sold separate on the site shop , even the Needle for slides or NEEDLE JETS (where slide needle goes in , and has acorn nut on the other end etc) – I try to put as much of the common carb parts on the site as possible, if something is missing i will get it for you or advise accordingly , i will look out for your email. Do not worry about idle mixtures, once you put the Size 20 Pilot Jets & Upgraded Main Jets ===> Set it to 2.5 full turns out from closed stop, then this is a setting forever. The “STARTING JET” (the jet that can’t be removed inside carb body) is what will start the bike first. This video is 100% our carb but imagine upside down
Great vid! Thanks for the info. Have sent you an email. -
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good afternoon. aguila 125. with a standard jet (87.5), the quality screw is unscrewed by 2 turns. how much you need to unscrew the screw if you put the jet 90 ???
Hey,
Mixture screw should be left alone because it is a 125. 90 is a good jet, go ahead and upgrade it 🙂
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Hi Marcel. You say I need to adjust the mixture screw to 2.5 turns out. I take it this is under a metal blank which I need to pry out? And therefore are the Air/Fuel rubber plugs in your shop to put in after adjustment?
Yes sir, here it is below:
click the pictures in the link to see where the mixture screw is located. PLEASE be gentle, it isn’t cheap and its very soft brass screw. If its tight or wont move, try air compressor or ultrasonic bath to get the dirt out.
Sometimes orings under it have probably cracked away (if you ever see fuel leak thru it or air hissing) (since it is “air/fuel” mixture)
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