Air box with a hole
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I have discovered that the previous owner has cut out the front of the airbox for more airflow. Letting all the air in without going through the air filter.
Is it better to put another type of filter? because I can’t find where to buy another standard air box.
The bike is a Hyosung GT125R
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Can you show us a picture if possible to see what kind of damage the last owners did to it ? We have airboxes on ebay and happy to ship worldwide. Maybe there is a way to fix yours if possible ? but try attach a picture here if you can
I have drawn it with paint, all the area with gray is cut off.
I was wondering that since the air box is cut, wouldn’t it be better to put this type of air filter and change the main jets of the carburetor?
Do you see it as a good idea?
Thanks for the reply.
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The hyosung doesn’t like pod filters, many of us worldwide have tried to use pods but the bike becomes unstable and its a very frustrating war of messing with the carbs everyday.
Trust me, the airbox wins.
As Jim said above ^ , why not a metal/plastic sheet there and use “JB WELD EPOXY HIGH TEMP” for plastic. This could be the cheapest and easiest solution.
No screws. Otherwise it may rattle and end up inside the engine and it explodes , very good advise from Jim
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I’d just seal it up with a sheet of 3mm plastic. Avoid using through bolts if you can. You don’t want hardware going through the engine.
The hyosung doesn’t like pod filters, many of us worldwide have tried to use pods but the bike becomes unstable and its a very frustrating war of messing with the carbs everyday. Trust me, the airbox wins. As Jim said above ^ , why not a metal/plastic sheet there and use “JB WELD EPOXY HIGH TEMP” for plastic. This could be the cheapest and easiest solution. No screws. Otherwise it may rattle and end up inside the engine and it explodes , very good advise from Jim
Ok, I’ll do that, today I’ll probably go to the garage. As soon as I fix it, I’ll update.
Thank you so much.
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I’d just seal it up with a sheet of 3mm plastic. Avoid using through bolts if you can. You don’t want hardware going through the engine.
The hyosung doesn’t like pod filters, many of us worldwide have tried to use pods but the bike becomes unstable and its a very frustrating war of messing with the carbs everyday. Trust me, the airbox wins. As Jim said above ^ , why not a metal/plastic sheet there and use “JB WELD EPOXY HIGH TEMP” for plastic. This could be the cheapest and easiest solution. No screws. Otherwise it may rattle and end up inside the engine and it explodes , very good advise from Jim
Ok, I have glued the hole with a plastic sheet and glue that says it can withstand 100ºC.
But it still goes bad. I have recorded a video, the motorcycle starts cold without the need for the choke. I also noticed that the AIS hose was not attached to the airbox but is attached to the exhaust. Plus it does a lot of “pop pop pop pop”. The intake nozzles are cracked.
Well, in the video it looks like the bike is going well, until at one point it seems to die but it recovers and finally dies suddenly.
At minute 0:30 and 1:18.
I suspect that the previous owner has messed up with the screws of the pilot jets.
At the moment I have ordered a gasket kit to clean the carburettor.
Regarding the intake nozzles, do I cover them in silicone?
Oh, by the way, putting the airbox in has been a pain. Any advice for next time?
Thanks again.
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We do not see a video link?
Mixture is 2.5 full turns from closed. Do not adjust this ever again because it is very difficult to optimize if bike has other issues.
So if bike has issues after 2.5 turns. Dont turn it again. Replace jets and have the carb ultrasonic cleaned. Then look for cracks in intake rubber manifolds.
- Sometimes it helps to replace intake manifold O-RINGS (like the ones you see at our shop)
Regarding airbox fitting….
1. Attach carbs to airbox
2. Tighten clamps holding carb to airbox
3. Airbox & Carb together will slowly (slowly!) Go inside intake rubber manifolds
4. Make sure manifolds do not get stressed. Be very gentle with that as they are very difficult rubber parts to buy. Korea stopped making them.
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We do not see a video link? Mixture is 2.5 full turns from closed. Do not adjust this ever again because it is very difficult to optimize if bike has other issues. So if bike has issues after 2.5 turns. Dont turn it again. Replace jets and have the carb ultrasonic cleaned. Then look for cracks in intake rubber manifolds.
- Sometimes it helps to replace intake manifold O-RINGS (like the ones you see at our shop)
Regarding airbox fitting…. 1. Attach carbs to airbox 2. Tighten clamps holding carb to airbox 3. Airbox & Carb together will slowly (slowly!) Go inside intake rubber manifolds 4. Make sure manifolds do not get stressed. Be very gentle with that as they are very difficult rubber parts to buy. Korea stopped making them.
Yes, I intend to change the intake o-rings. I have looked in the store and it seems that you do not ship to Spain, right?
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We ship worldwide everyday. Send us an email (Tap contact the bottom of this site) The checkout was locked to UK/ireland for free shipping. Overseas = we use multiple shipping companies to find the cheapest quote or fastest delivery & we ask overseas customers to give us accurate addresses properly (in a style we explain them) thats why we have not had any international delivery failures for years now due to wrong addresses or customer spelling errors. 🚚
Or you can buy them on our ebay shop (@evocrest) – ebay will use their GSP shipping and you pay them shipping costs not us. 🙂
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