♠️ M77
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Turn the key on and off 3 times and dash will display the error
or go to “Technical Section => Manuals ” and download the 250 service manual on this forum and let us know what code it says.
Are you able to ask them to put fresh fuel in the tanks , then start the bikes so you can here also the engine sounds if it sounds healthy to you
or will the shop sell them as guaranteed “running & alive” ?Gets easier to make a decision on which one to get
The CDI is not restricted whatsoever. We have tested these loads of times under different engines (old and young)
90 and 92.5 is OK, but check these
- mixture settings , if no one messed with the screws , don’t touch em until you show us the spark plug colours inside and outside the plugs.
- Slide Needle should go back to “middle” setting OEM (click here)
- What is the current size of the “Pilot Jets” 17.5 or 15 ? (affects how well you take off too)
Show us the baffle of the exhaust and i will advise how to get the best out of it.
Try also Motul 7100 oil or Silkolene Pro 4 , the gearbox will be much smoother. For many years i always found Hyosungs just love these 2 specific bottles!
Change filter too!
Though, it is not a bad idea to strip the clutch and use the service manual to measure spring height and plate thickness , just to avoid any tendences of micro-slips of the clutch as if the bike hasn’t had a clutch change since it left the factory (some owners ignore this and sell it on, leaving you to pick up the pieces!) – I always overhaul any used bike i purchase just to act as if im the first owner.
You could always try a 17th sprocket up front , since OEM is usually 15T, ask the same guy who did the conversion for you?
Sprocket is looking good on that bike 😉
More pictures to our email once its all set up and done, i might do a shop page for it , i actually want to.
Welcome ❤
Post some pictures of her and I hope you have been putting some miles in before the cold season starts!what size are the main jets ?
Have the slide needles been altered (it has 3 settings = richer (best) , factory , lean (bad) ?
Are the slides sicky (check they might not be lifting or retracting properly to allow the main jets to give out the fuel needed for power
What size are the “pilot jets” and “main jets” on the bike ? let us know
Also look at the spark plugs (get fresh cr8e first) , go for a short ride if possible, pull them out and take loads of pictures to show us.
I would not wish for any major surprises! The fact its working well, despite the right switch woes but looks like you already figured it out! – I would have said an ugly alternative was to shoehorn in a momentary push switch inside the RH cluster.
Have you considered the shingden upgrade kit that you see on this shop? I would never use the OEM or Aliexpress type regulators on these electrically hungry beasts , no way , i have seen time and time again they love to fry their connectors and melt wires. If its an EFi machine, even more stressing to use a genuine shingden upgrade with a fresh stator kit. Your volt gauge will be reporting a consistant 14.4v
Would you be open to a carb conversion ? Far less headaches this
Or find a 2016+ harness and get a DELPHi ECU
Yours is DAEWOO , not made anymore but it is possible to find it on eBay Russia or eBay Israel
I believe since you are in the states, give WhyGoStock company a ring, they might have it locally!
Now that i have seen what you are doing , I actually want to hear it alive , that is one unique build i’ve seen with a Hyosung engine in it!
Honestly just want one to be on the safe side still a noob rider started on this thang instead of a 300 or a 250😂
You are very brave! – I would definitely keep it slow until you really learn its power and how to use it properly at the right situations.
Also tyres matter a lot (a lot), so be sure to use Michelin Pilot Road tyres (very recommmend) and do whatever the service manual says to do (every bit) , and you may still be with her for a very long time. They last as much as the owner takes care of it (sometimes better than a stupid garage/dealer does)
Hondas on crack , haha that’s a new one lol. The Hyosungs do have a character that isn’t compared to other bikes, you either hate or love it!
Sounds like you’re enjoying it so far , good to see it on the road (if anything , they don’t like sitting around in the garage looking pretty 😉 )
Yes, it can be blocked off. Click below for full tutorial
Sadly they do not exist for the GT650R anyway , so it is a custom job. Why do you need one ? Most people seem to ride okay without it.
Maybe the fuel pump is working but acting faulty because.
Or maybe the fuel pump needs a strainer (it is like a filter attached to it) is clogged with many particles.
If you have fuel that is E10 , throw it away and use E5 petrol because our older EFi machines do not like E10 petrol.
Also change the spark plugs one more time , and only use CR8E (sometimes old plugs will be problematic to create stable sparks)
The ECU is working , so turn the key on & off 3x , and wait for the “Red FI” light to flash.
When the FI light is flashing , count the number of flashes.
For example 10 blinks (pause) 5 blinks (pause) 5 blinks (pause) 1 blink = This creates error code from ECU called 10-5-5-1 and we can find this error in the service manual to tell you which part is faulty.
Keep us updated and welcome to the club
Can you get hold of a compression tester ?
Warm up the bike even with choke for 10mins max
Then remove spark plugs on both engines
Put compression tester on front engine spark plug hole => Press start to crank bike for 5 seconds maximum
Record the PSi reading from the gauge
And repeat this for the rear engine
Tell us the engine compression on both cylinders , i feel like it is best to start here first.
If the engine is compressing well above OEM specs , then it is easier to diagnose the carb next
if not , copy these instructions and have your mechanic visit your bike to do it first, and update us the results.
Side Stand switch bypass = Get electrical tape , cut the wires under the kickstand going to the stand switch ==> now join the 2 wires from the harness going up to the front tyre , and use lots of tape to waterproof it and avoid any arc’s or electric sparks/shorts.
Side stand is bypassed.
Let us know if it worked.
Clutch switch = Plug will be under the airbox near the left side of the frame , find a similar bike that uses the same clutch switch as hyosung , even an old Honda machine , or go to bike garage with your old switch , ask them to order you a similar switch for the clutch lever.
If you remove the clutch switch, check wires for rust and use contact cleaner product (it may be called a different name in your country)
