Dennis
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Hi guys,
Well I finally received the intake rubbers but unfortunately the seller sent me part no 13120HJ8201 instead of 13120HJ8204. He is claiming that the part should fit perfectly just the same. He said that part no 13120HJ8204 is no longer available from Hyosung.
The main difference seems to be that the connection to the emission device we had discussed earlier in this post is blocked off. No serious problem there.
But I also got the impression that the rubber might be bent at a very slightly different angle. I cannot compare so accurately since the old one is still in place. I must say that the part does actually have GV250 imprinted on it but I know that there were a few minor alterations on the bike since the original model was produced.
This leads me to my question, does anyone know whether these parts are a perfect physical substitute for each other?
Thanks for your kind support
Hi Guys, well I am still waiting on the new rubbers to arrive from the US but it seems that I am not going to need them for now. 😀
Yes I have finally managed to sort out the problem. As I had mentioned in one of my first posts I had replaced the plugs, fuel filter and cleaned the air filter. Well the fact that the plugs were quite sooty kept echoing on the back of my mind because as Marcel had mentioned this is normally related to a dirty air filter. So I decided to carry out a small experiment. I cut out a small piece of towel the shape of the air filter and placed this instead of the filter. I went for a ride and was impressed at the improvement I felt. It was obvious that using compressed air to clean the filter wasn’t good enough. Kindly note that I would have also replaced this but the local dealer didn’t have any in stock. These people are more interested in selling new bikes then supporting the older models. 😡🤬
So now I needed to get hold of a replacement air filter, at least I managed to source this in Europe so it shouldn’t take that long to get here.
In the meantime I also tried to find some other information about the best way to clean a paper air filter and I came across an article saying that you could wash this with water and detergent so I decided to give this a shot and believe it or not it worked wonders.
At first I was thinking water and paper… But I was very surprised at how hard the paper in the filter was. I am not sure whether all paper filters can withstand this procedure, so if you do ever decide to give it a shot, this would be entirely at your own risk.
This is the way I went about it:
Find a container which can take the full length of the air filter an fill this with water and dish washing detergent
Let the filter soak for about an hour and after this grab the filter and start to move it around it the water just as if you are forcing the water through the filter.
Then get hold of a very small paint brush (something that will fit in between the paper folds in the filter) and run this a number of times through the folds in the filter rinsing the filter every time. You have to be careful not to go too hard with the brush keeping in mind that this is only paper.
After having done this with the brush, 3 times, rinse the filter in clean water and leave it to dry in the sun. You have to be absolutely sure that it is completely dry before installing it back and running the bike.
As I said this procedure worked perfectly for me and I only tried this because I didn’t have a replacement air filter available. So this is just an interim solution. Installing a new air filter is always the recommended solution.
I am also curious to know whether anyone has tried to rip out the paper of an old air filter and replace this with proper foam. Is this a good idea?
Well looking on the positive side I managed to source the intake rubbers for my bike seeing that these are now becoming very hard to come across. While on the same subject are there any other parts that you would recommend I stock for the GV250 carb model.
Thanks again for your support and advice.
Well guys I have managed to apply a reasonably thick layer special silicone designed to resist heat over the cracks on the intake rubbers. Left it 24 hours to make sure it was dry and then went for a ride but unfortunately the problem persists. I have now ordered new rubbers (managed to source these from the US) quite expensive but I am going to have to attack those carbs.
Thanks again for all the support and information you have provided me with. I will post an update once I complete the next challenge 😓
Thanks Marcel, noted. Ok so the carb cleaner did prove that the bike does have vacuum leaks, so some basic repairs are next in line until I do manage to source replacement rubbers. Unfortunately ebay isn’t much help in that regard. Also while tracing the pipes in connection to air flow I came across this device and can’t really figure out what it is and does. Is there any way of testing this?
Hi guys, just a short update from my end. Well I have checked the coil and plug resistance and everything seems fine there. I also noticed that the plugs were a sooty black. While I had the tank off I also had a very close look at the intake rubbers and they are definitely in bad shape. I came across some hints about checking these for possible vacuum leaks just by spraying carb cleaner over the cracks while the bike is running and observing any changes in idling. I haven’t done that yet, I’ll probably have time to do that later.
Am I right to assume that should there actually be vacuum leaks in the rubbers this could well be the cause of the symptoms I am experiencing?
I also came across some ideas of using some Super RTV silicone adhesive to block off any leaks should these actually exist. Has anybody ever tried this?
My plan is to check for leaks and should there be any, use some silicone adhesive to temporarily block these off to see whether this solves the problem. Then if it does, start looking to purchase replacement rubbers 🤞🤞🤞. Any thoughts on this idea?
Thanks again for all your help!
Thanks for your replies and encouragement guys. I will follow your advice and get back. As for the intake rubbers, well that is another concern because while I was replacing the plugs I noticed that they were in a reasonably bad shape so if I do end up having to take out the carbs I am going to need to replace those. Following Marcel’s remarks about availability I’ve had a quick browse on the internet and it does look like I might be in trouble. Do you guys have any recommendations about where I could possibly source these? Thanks again.
Thanks a lot for such an informative reply. Obviously going electric is a bad idea. The main reason which caused me to come up with this idea is because I have started to experience jerking while riding in a higher rev range. So far I have replaced the plugs, fuel filter and cleaned the air filter. I have also taken the fuel pump apart to see whether there was any particular dirt in it but everything seems fine. It also seems to pump out the fuel quite well proportional to the engine revs. The bike is used on a fairly regular bases so I don’t think that any fuel residues could have caused any blockages in the carbs and to be honest it seems that removing the carbs on this bike is quite challenging and I would like to consider this as a last resort. Has anybody experienced something similar to this? Any ideas what could be the cause?
