♠️ M77
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Yes correct, H=a bit more extra juice lol. Same physical size.
Welcome back to the biking world, may the hyosung treat you well on those much due coastal trips 😉
By now you should have been reading the manuals, some older topics on this forum to learn about what to look for etc, to familiarise yourself with the bike ,i can say they will last as long as the owner maintains her well.
Hey,
The manual says not to tamper with the air mix screws and i agree with the koreans as they tuned it right for 125s , tuning it is going to the abyss and extreme as the pilot jet is the perfect size. Hence pilots dont change either, even 1 step up is just too big. 15s can power 600cc bikes in a row of 4.
Assuming you have probably read the tutorial on how to swap main jets on the forum, you can change the mains to 1 size up max that helps with full throttle riding for sure.
full throttle riding is also dependent on the carb float height, when the carb is upside down on the table, the floats should be 7mm height & watch the tangs (near fuel valve ports) are not bent.
so we have fueling sorted, but it will be only as powerful as the sparking system, so while the bike is apart, you or your mech will confirm these figures:
– HT lead to the frame = 6k ohms max (coils & ht cap check) high ohms? = replace.
The coils are one of the major sources of bogging or top gear riding then it starts to wane, common on many hyosungs, we tend to uprate n change the lot.– Spark plug = Clean the IX plug but be warned that RC’s dont like IX or Denso plugs once they start to perform poorly due to RC having weaker sparking system than older gen bikes.
The RC likes the STOCK CR8E plug (yellow) or platinums (silver) just win them over, i wouldn’t go back to stock plugs eitherTo comment further on richness etc , heat, —– click “add media” on the reply box and show us the spark plugs in the middle.
The regulator is your last worry, it will say 14.2v at the battery around 3k revs then its healthy. any single 13.xx reading whatever revs …. then investigate battery or reg itself.
now if we have electrics sorted, your bike should be zippy from 1st to 5th with good fuel and spark sorted out.
Fatter lines don’t generally add any torque except we enjoy the 5th gear more as bike feels less starved off (more juice) & less likely to just cut out. Cold starts are a little better, its hard to ignore overtime. if the stock lines are 2-4yrs old , change em as book suggest, and the filter isn’t clogged (clogged fuel delivery parts can bog the bike down)
Hope that helps , let us know.
I usually sell old genuines on ebay or new ones as a custom order usually £6-7 each. You might have to message me as I havent checked what sizes i have left.
Some folk go to wemoto for cheap china made jets around £4 typically.
I prefer jap or least genuines so i know the chinese didnt use fake brass or inaccurate ofrices to meter fuel but i digress lol. Cleaning bad jets is quite annoying. Or some £1 ebay ones too.
The circle head size is 8mm for the bds26 carb
Assuming you had already found the jet swap tutorial on the forum, then ofcourse sizes are 90 n 92.5 optimal .
92.5 n 95 at the extremes if the entire charge & sparking system is that beefier for it.
Hey,
I think i saw your post on facebook while away, thought other admins replied.
Okay, lets get to it.
Take apart the dash surrounding panel.
Then look behind the dash for signs of water or electric pins corroded as i was helping someone with this issue too last week. He went through heavy rain but bike wasnt well taped up. So check the harness that goes up to the dash
Second part. Take apart the airbox so u can access the big harness along the frame. Blue plug is going to the dash. Black is for right switch gear. Green = ignition keys . Yellow=left gear.
Clean the blue plug which leads to the dash incase of debris/water attacks.
Last thing, open the dash unit itself. And confirm that water did not enter the dash (rarely but happens) that can make electronics spaz out.
Under the LEFT pillion seat. Check fuse is 15a max too. Its blue color fuse.
Let us know how you get on. Hopefully its a small wire fix/clean up job. Id hate to replace the whole dash.
The size for clip-on bars holding the rubber grips are 22mm diameter 👍
Welcome fella!
Hope you’re out there riding through the bank holiday weekend sun , as some of us are lol
I had a feeling it was going to be a sentec or daewoo type but the sentec is the 08/early 09, so very rare nowdays. I’m going to trawl the facebook group if other lads are breaking an EFI 08.
The UK trade makes it difficult to order it new as not made anymore, KRmotors are supporting the latest ECU’s now. I’d have to ring a few breaker yards myself for any write off efi bikes to salvage from.
Let’s keep our eyes open , push comes to shove , there is always the carby route!
We had 2 major meets this year but this one in august was cancelled due to weather, i was looking forward to a welsh trip!
I am going to plan an impromptu meet near manchester or something before the weather turns cold with a few hyosungs but i am hoping 2020 will be better as that gives time to plan, we may meet at Lincolnshire, as we never done one at the east in 2018 , it was all midlands and the near north.
Speaking of travels, welcome back to the bike world and don’t leave so soon again 😉 – By now, you’re probably preparing yourself for a little trip with the hyosung to get in to grips with it.
Good to see more 650 folk onboard, i don’t like the rain either for pleasures lol.
Hey,
For the 2010-2018 bikes (RC new shape), follow this link below:
https://hyoriders.club/shop/service-maintenance/stator-generator-hyosung-gt125rc/It’s because the RC needs a GV’04 flywheel conversion kit to use the uprated stators, new bolts, puller tool, gaskets, all included hence its a special order.
For regulator/Rectifier, it fits all GTR 125 (any shape model), it is this one here:
https://hyoriders.club/shop/service-maintenance/performance-regulator-hyosung-gv-gt-125-250-r-gtr/The ignition coils are bolt-on replacement, pretty much swap & go business here.
You get 2x of them ( front & rear in the same box) (a pair)
https://hyoriders.club/shop/gt125-gt125r/high-performance-ignition-coil-hyosung-gv-gt125-250-rtrx-125/If i missed anything, shout away! 👍
Hey, hoping you found you way to access it & see your levels. A torch might be handy if there is low lighting.
If not, Behind the rear engine the reserve bottle should be exposed when the coverings are out of the way, shields/panels. The rear motors of our twins like to run hot lol.
Hey,
It sounds famously like the dreaded 60mph (95kmph) bug that happens to faulty coils or clogged carbs.
Remove your spark plugs and clean them (50/50 chance they may need replacing if they aint sparking hard anymore)
Get a meter , put red wire inside HT cap. Black wire on the frame. You should read 6,000 ohms max (6k) for the coils .
Take a look below and learn how to remove carbs off the bike , then you can clean them.
– Take out the piston slides (black tubes) = clean with a cloth & its carb holes (piston walls)
(they control main jets)– Get a carb cleaner & compressed air can (aerosol air) , and blow the jets clean from particles.
– Put the carb upside down, make sure the floats are 7mm high (not less , not more, just 7)
(full throttle fuel control happens here too)LINK BELOW:
https://hyoriders.club/forums/topic/tutorial-hyosung-gv-gt-125-250-how-to-swap-carburetor-main-jets/Let us know if that worked , before attacking other parts of the bike, as these 3 ^ above are usually main culprits (plug | carb | coils)
It would be easier to look at your spark plugs, take them out youself so we see what your engine is doing ?
CR8E is the stock plug thats correct.
Dont think it would have taken a lot of R&D to fit a oil pressure warning light. About 5 mins at a guess, especially as the cluster has the light already fitted.
The aftermarket route was just to fabricate some mini STAGE6 cluster and read the custom fitted sensor near the bottom engine casing.
The 250rs have oil coolers and since the dash is off a 650. It has the TEMP bars switched off on carby models (650 has a water radiator but what gives? Lol)
The EFI 250 came later with a new display off the efi 650s , but modified to turn OFF the temp display….. despite the sensor is clearly visible on the motor block (aka. ET Sensor) they could have just made the extra R&D for dash to display the oil or engine temp anyway or check pressure flow as you mentioned about GV
Its a mess lol, ive read the GV service books. Only says use a hand held gauge to read preasure when servicing thats it.
Welcome to the site fella . Never to late ti be back on the 2 wheeler life , dont exit it again too soon 😉
As for GV250. Ive been working with another member to sort his EFI model as it had some running issues.
If you are able to provide the year it was made eg. 66 plate etc. As GVs have 3 types of ECU.
A list of specific bits missing wouldnt go amiss and some attached images on to this topic could shed more light in to it 🤞
The gv650 read the temps of the radiator and displays it on the dash
the absense of an oil cooler (like the SV) probably means it probably wasn’t intended to have extra sensors for oil related functions of the gv bikesI couldn’t have imagined Hyosung spending extra R&D to do a oil pressure related work & display it on the dash , maybe not readings as in bars or numbers , probably they could have just used a car’s oil lamp that flashes in some sequences (some bikes do this) fast sequences (blink) probably means oil pump issue , slow blink maybe pressure to low etc .
Peharps more likely to have appeared on the EFI bikes as ECU will have a field day with all sorts of sensors attached to bike.Carby life meant the bike just needs CDI, Coils, Carb, Coolant Switch & Temp controlled fan for the radiators. Less R&D time by their hands i guess.
Hey,
Sucks to hear about the drop, trust me i’ve dropped mine in the garden and could hear the wallet crying lol. But with a good chassis, its mainly cosmetics to fix upSpeaking of , the master reservoir fits any hyosung GT/GTR if it has 7/8″ fitment, some Aquilas have 1 inch bars (fatter), so you would have to confirm which one it is , even peharps attached pic too.
I wont lie, rode the inline 4s 400s after my test , test rode friends bikes zx9s , triple 675 , i prefer the hyo twins knowing how the sv650 pulls as my mate had one , i suppose its up to your tastes and what you want out of it, the hyos are quite honest twins lol, fact is know that the hyo pulls better than the Sv anyway.
They are heavy, i wont lie about it, i have to be gentle pushing it around , doesnt feel like it when you start riding away though
