♠️ M77
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Punch a hole in the gas tank and light it.
😮
Measure the hole of the exhaust inside (the circle inside the exhaust exit port is 19cm for example)
Go on ebay or amazon to find 18.5cm OD baffle (0.5cm is less on the baffle so it slots in the 19cm hole)
Drill a hole thru the exhaust TIP under it and THROUGH to the baffle.
Then use bolt and nut to lock it
Swap the front and rear ignition packs (HT cap, coil) and use fresh CR8E plugs, tell us if the problem happens on the front and the rear engine sparks better ?
Then you know its the ignition packs
Okay,
I have to ask though, how is the engine compression ? Get the bike warmed up hot …. remove both spark plugs , check compression at full throttle and tell us the result.I might have a small suspicion that one of the cylinders may be a little lower than spec but we shall see after your report , because it seems like you changed everything to all new parts?
Also , why not change the fuel pump as new again incase the old one of 3 years is no longer performing well, you said it was okay in the early days but now the bike is misbehaving a little bit, so it could be the pump needs changing again , usually sometimes rough running or rough idle is the pump.
Try that too, and also check the TPS using service manual again to check its in spec, the idle can be affected , then reconnect the ISCV
Though if you said “i removed the pipes from ISCV” and the engine idled normally, = normally on any motorcycle more in the engine to make it idle usually means the air filter is stuffed (intake system chocking) or the ignition parts are producing weaker spark causing a rich condition that includes quickly fouled up plugs
GV250 isnt compatible.
GV650 Non-classic DELPHI should work OK, but i believe the reason for 2 different part numbers is likely due slight changes to both bikes but the principle really is that both engines are 650 and they both use Delphi Sensors. It should work, otherwise expect one or 2 sensors being changed out to satisfy the non-classic 650 GV ECUIt should be fine! – as long as it says DELPHI (Aliexpress versions are not usually OEM & don’t say DELPHI in big letters on the black plastic body) and it also says “GV650” on the white sticker.
Is your ECU a Delphi brand or Mitsubishi Japan or Daewoo etc (between 2008 – 2014 Hyosung used various ECU’s with various matching harnesses and sensors for them, until by 2015 came around, they made sure all future models use Delphi ECU)
Hey , ofcourse we ship worldwide, just click “CONTACT US” at the bottom of this site and send us your parts list & your address so the cheapest shipping quote can be found for you.
It’s because for shipping abroad, there is many carriers to choose from with their own prices. UK is always free as it is domestic to us that’s all.
When the engine is hot , can you do a compression test to confirm what it says on each cylinder with both plugs out and full throttle
Ill have better advise after compression results.
HyosungFactory is a scam site of the defunct clone of HyosungSparesUK (which was also a scam site, so bad that it only got hundreds of 1 star ratings on TrustPilot) – So their links were removed as they don’t deserve anyone’s custom. “wholesale” tried to email us for business, they were declined , if the site is blue & white , it’s usually the same clone including .au , .nz , etc
UK distributor that’s licensed for Hyosung is MotoGB UK (ring them) and SINNIS MOTORCYCLES (for newer models now)
Hyosung Korea has discontinued making any parts for the older carb models , so their main focus now is just the 2019+ models (injection bobbers)
eBay UK does have sellers still selling exhausts or take your old exhaust to any fabricator and ask them to clone it to stainless steel version
LEOVINCE ITALY still making beautiful exhausts for your specific 2011 model, expensive but it’s on Amazon UK
No STL files exist online sadly , but we have new ones on ebay (brand new) , regards
Sounds like you got this , have faith with it , at least “new” parts won’t have any excuses to run, so everything should just fire up with all the stuff being new!
I can’t confirm where it ends up in the harness or what section of the bike, so my advise is limited.
I suppose you will hav to trace everything make sure everything is plugged in, then as much distance away , let’s try to identify the wires again
Regards
As much as you need her for work, it seems that it would be recommended to remove the tank and all the panels.
Take the harness off , to check for burns and the ECU = Being the 2 most costly items. I know that it is OK to send 12v to the starter motor but without sounding crazy, lets say
The bike can handle (example) 80Amps , the jump pack or jump leads of a running car/van sent 12v at 200amps , that will cause a lot of heat in the wires and cook everything, since the starter motor shares the same battery as the rest of the bike.If the starter motor gets power, assume rest of the bike will also get power (as if to bridge the start button entirely anyway)
If i made any sense. I hope
When cold (overnight cold)
0.10 – 0.20mm = All intake
0.20 – 0.30mm = All exhaustSweet spot = 0.12 for intake , and o.24 for exhaust , just to avoid being at the edge of either number!
2.5 turns out each pot. Leave it there forever & ever. If there is issues , the bike needs attention elsewhere (meaning leave mixtures alone after this)
Factory is around 3 turns out each. I would NOT try to go below 2.5. Jetting is easier than messing with mixtures.
If the plug is “oily” with oil drops , consider the valve head seals like this one
Engine Valve Stem Guide Oil Seal (x4 Seals) – Various Hyosung Models
But inspect the plugs first , then fit a NEW set of CR8E , as old plugs that are fouled won’t make full power anymore.
Service manual says plugs are that are fouled (either too soon or ages go) must be changed right away.
#4 I have a suspicion about the fuel pump to be honest. The injectors respond as quick as the fuel pump sends fuel to them. See if the injector cleaner fixes it or improves the situation. I would get a new pump (not use) , just incase …. KEMSO is OK , it can fit in the housing of the pump, just make sure it comes with a strainer that faces down to suck fuel thats at base of the tank. Otherwise I hope i am wrong and it is just the clutch needing an overhaul (power from the engine has to go through the clutch to power the back wheels, so bad clutch may mean some BHP lossses)
Having new injectors is a not a bad call!
Time for a new harness ? or a new part ?
Can i ask what were you trying to do or what was the issue before you did all that ?
