Fuel System Problems and Question about GV250
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Hi all,
My girlfriend just picked up a 2007 GV250. We knew when we bought the bike that there was an issue where when you twist the throttle, it dies. It was too good of a deal to pass up on, so we decided to give it a try as her first bike.
When we got it home and started working on it, I figured it would be a fuelling issue, so we took the tank off, and there only appears to be one carburetor. Everything I saw online for these bikes showed that there should be 2 carbs, so I’m wondering if that was a factory thing on some of those bikes, or if someone has swapped this in since. If anyone happens to have any diagrams showing a single carb, that would be much appreciated.
The issue with it running does appear to be fuel related, as I did get it revving slightly by playing with the throttle adjustment on the carb, but it still does sometimes die, and when I do get it running sometimes it won’t idle now. Also when it is sitting not running, there is sometimes fuel leaking out of the intake side of the carburetor.
If anyone has any advice on what to try to make this work properly, I would really appreciate it.
Thank you in advance!
Kevin
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Welcome to the site , and glad you could join us!
Can you please show us a picture?
No vtwin Hyosung makes has ever ran well on a single carb , actually i would like to see what’s under the hood too, incase i spot parts that shouldn’t be there either.
Regards.
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Sorry to interrupt, that’s a rather impressive modification and is definetly not stock as the two stock intake boots seem to have a T piece to another carb. Whoever did this was quite clever. Hyosungs usually have 2 mikuni carbs.
I have been playing around with mine today which is a 125 but very similar otherwise. This is so different, though rather tidy. Being that you’re adding fuel to get it to run properly, you may have a vaccum leak or they never bothered to get the jetting right. I would say try adding an eighth (1/8th) of a turn out (as if you’re removing it) to the mixture screw to see if it helps. failing that you’d probably need a bigger jet if it’s not a vaccum leak. Obviously not being a stock bike i haven’t a clue what that carb is and i couldn’t tell you where that screw would be but if i’m to hazard a guess it will be near the choke, maybe even part of that mechinism.
Being non-stock you may have a hard time getting it to run correctly but having a single carb does remove some of the difficulty out of tuning it.
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There is a fan that’s on the oil cooler. I would get rid of it. The oil cooler does the job very well and your climate is not the sahara desert so it will never burn itself , just make sure to use quality ESTER OIL as they really love premium oils. Even the gearbox will feel smoother.
I gotta say, he must have had so much trouble finding the Twin-Carb (OEM & best performing) , the owner had to resort to strange fabrications to make a single carb system.
The “Rubber Intake Pipes” that are on the engine heads are OEM and correct, look after them very well.
Looks like you need
– Twin Carbs (Hyosung GV250/GT250 Carb Type, not fuel injection models)
– GV250 airbox (carb type!) as injection model airbox does not fit.
– GV250 “Large” rubber airbox connecting tube
– GV250 “AIR FILTER” box that hangs on the side of the bike and is more enclosed (No pod filters as hyosungs had them)
– Possible throttle & choke cables if they are not OEM ones. (Carby type) as EFi injected doesn’t fit.Seriously though, big respect to whoever did the work to make it run on a single carb “BUT” he should have just found 2 single mikuni carbs (jap) and fabricate an airbox that accepts a filter and hides under the tank , like most bikes do.
It’s up you which direction you want to head to ?
– GO OEM (Recommended) but costs & time to wait for parts to arrive. (That’s if your local wreckers don’t have it, then i have to go get the stuff from donor bike as such)
or
– Spend lots of time away from the rain , as it doesn’t look like it will survive a rainy day and have to meticulously fine tune the carb to try run 2 engines in harmony.
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