โ ๏ธ M77
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That’s new , if you ever do valve clearances next time, remove the cam shafts and tighten the long 4x engine cylinder bolts which holds the cylinder head & piston jug together , but this may help squash the gaskets a tiny bit (a tiny bit) , but worth checking next time.
That is my suspicion , it doesnt seem to come from the top of the valve covers but near the piston area, so could be piston jug gasket rather than engine crank-half gasket (bond),ย Hyosung uses factory “bond” to join the crankcase halves together,ย otherwise some people have been rebuilding engines with some gasket card and cut it to fitย or they use engine bonds used by cars to bind the cases togetherย , theย service manual for your bike (at manualslib) should mention the type of bond used.
1 & 3 – For gearbox area, so you got lucky!! _ Ignore them next time.
Drain Oil using #2ย in the picture
before refitting, did you consider replacing the intake manifold rubber O-RINGS , as these are known to cause hidden leaks causing all kinds of boggy behavior . If fitted already, spray carb cleaner around the intake pipes to see if revs change ?
Does it start without choke when its ice cold ? its a small tell tale sign if things are good under the hood, and normally it should not need it heading in to summer now.
To rule electrics out, check this link below and report back with your figures?
Rectifier – How to Test Stator , Battery , Regulator – GT125R Carby
wow , that screw is well and truly gone, i always wondered why the need for brass instead of stainless versions, they do that for the diaphram slides already, but i also would have loved to see stainless acorn nuts under the floats. Saving weight maybe?? I doubt it, the bike won’t notice a few grams being shaved off, its wheels are already a combined 40kgs!
Have a look at this tutorial below , you will need the chain attached as it makes things easier.
[How to Tutorial] Upgrade 520 chain & sprocket kit on GV125-S EFi (GV125 S 2019+ Models)
It says on G Drive “You need access” , maybe set it to public share link ?
Don’t get me started on mixtures either, it’s something i constantly have to deal with in my own workshop sorting customer carbs. Takes more of my labour time than doing valve clearances!
Have you tipped the swear jar so your wallet fills back up again ? ๐
Take a look at this topic , it has a lot of info that might help, (I hope!)
If its 4 pins , same relay is used and typically it stays at the rear seat area and 3pin socket is for indicators.
The carb below is the one quoted in the spec sheet for the 250cc โ PD26J. The clone of the Honda 250 rebel carb. Looks very similar to the Hyosung carbs.
How can I send PMs in this forum?
Thank you.
We did have the PM system before , but because of AI on the scene, I locked it down to stop guys getting silly PMs of AI Robot girlfriends and Ai gold diggers trying to get past this site, so I will figure it out one of these days. Though if publicly one has asked Rider 1 on his forum to contact me to send an email to Rider 2 , then i will facilitate the email exchange, it’s not ideal! but it’s one way around it temporarily – I don’t like adding “are you human , solve this complicated puzzle before sending this message etc” like you see on the contact form , I want less friction for everyone , not more of it. bare with me!
Honda Rebel carbs , nope, but some HAS made their own welded custom manifolds on a GV cruiser with a custom airbox , and made it in such a way that the carbs hang at the side of the bike (almost) and used keihin flat sides, this was many years ago, so can’t find the post on social media. I thought to myself, ahhh narr , I will just get another OEM set and rebuild it patiently! – carbs take too much of my workshop time but i will always choose them over 30+ EFi electronics i need to stay paranoid about.
Cost of living on the world isn’t going to make a rider fork out ยฃ1500 for an engine, they would get a whole bike for that! – 50+ units could work for a dealer though if they have a fleet of bikes and need spare engines for their customers in their workshops.
if the intake manifolds are 2016 = made in china, very poor quality even OEM ones! , if the intake pipe is 2008 , much better and made in South Korea. I don’t have too much faith in China lol.
Hyosung has used a few chinese companies to replicate their older GV engines + Parts for the Asia market, so you will find the updated chinese/korean engine updated as “GV250-DR” , they definitely stopped making GT parts , so their main focus is GV bikes. Hyosung KR Motors owns a chinese company thats even cloning their Korean 650cc for the updated GV650 ABS model that is already out in europe.
If you strip a 2016 black engine, of a 125cc, you will see under the barrels , it will say “made in china” but other parts + R&D is still South Korea.
China is just wild , they even call Hyosung a different name over there!
would that be an EFi or carb model (Carb models got sold until 2010 but EFi started in 2008 = So its a transitory gap hence we ask)
What work has been done to the bike so far to try overhaul it ?
Not something that is usually uploaded here, so you might need to buy a spare ECU to download data off of it.
Can you attach a picture showing / marking the areas where you see the leaks ?
yes ofcourse, we got your email and responded to it!
Happy bank holiday!
Have you checked everything else mentioned in my previous comments ? – You either have compression issue or carb issue (explained above) or electric
Go halfords and buy the yellow “bradex” easy-start , spray the air filter for 10 seconds, put it back on the airbox or spray inside the airbox – Make sure the airbox is on and secured (harder to start without it properly)
Full choke, crank and let it scream to life , then see if the carbs will run on choke for 5mins, then slowly turn the choke off
If it dies, let us know – Also check if both cylinders are hot if its running on choke?
you either have fueling issues from a clogged tap, clogged pump , (yes new parts can get clogged up if the tank has debris) or the carbs need attention (likely “Starter Jet” that is permanent is clogged, pilot jets clogged up) or even the carb passages (every hole in the carb) is clogged
Or you will need to check your intake manifolds, and replace their O-RINGS if there is micro leaks under there causing a loss vacuum to open the pump / carb isn’t being utilized properly by the engine due to vacuum loss)
Check spark plugs if they are wet ? (fuel is entering engine, therefore it should spark and start)
No need for a new caliper if you can check out the shop above ^ for the stainless rebuild kits.
Speed Sensor = ebay (you will find it there as we listed it) just type “Speed Sensor Hyosung GT” , it will be the electric one.
Fuel Sensor = Same thing, its on ebay .
Tyre – We have a michelin rear tyre that is good to go, send us an email below
