GV125s idle speed when hot / ISCV problem (Idle Speed Control)
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I finally had the time an weather to ridea a little longer and i noticed something (dont know is that an issue or a feature 😉). When the engine is hot (two bars) and i hit the clutch and release gas it doesnt go to 1,7-1,5k rpm but stays around 3k (or fluctuates 3k-2,5k rpm). It happens as im riding, or at full stop at crossroads etc. When i rev it up it sometimes goes back to 1,7k rpm. Also when left alone without gas i drops down. Is that supposed to be as is, or there is something wrong?
Spark plugs new, valve gaps adjusted, new oil and filter, new air filter.
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As per simon says,
i wanted to add by saying flactuating idles may also mean that it’s time to check for these too:
- Airbox Sensors (air sensors) are not clogged up?)
- Air leak around the intake parts of the bike ? causing surging revs and dipping revs etc.. (like a yo-yo)
- Lambda sensor at the exhaust, give it a good clean and retry
- If you are near shops for cars or bikes , please by this product below , put “ALL OF IT” inside the tank, (and use maybe half a tank or normal fuel to mix), now this liquid will travel all over your fuel system and try to clean anything that’s clogging up (funny revs can also be a sign the bike is “trying” to hunt for fuel to make stable revs or it revs higher from ECU to stop it stalling)
- ISCV (idle speed control valve) – Common Hyosung thing, sometimes they work for years without issues , but check it , it is near the airbox. it is electronic with a big plug usually (but Hyosung may have shrunk it)
- Do not use Redex. Only this product is my recommendation.
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ISCV on EFI? On the schematics i only found tps (throtle position sensor) and AIPS (air intake pressure sensor)
Yes every EFI Hyosung since 2008 has had an ISCV to control the idling speed, otherwise , you might have an early batch of the GV12-S that doesn’t have it ? Sometimes it acts as a fast choke to warm up the bike in brutal winters
Also i know for a fact Hyosung used 2 variant’s of ECU’s , early vs later model, the later models use a DELPHI ECU with twin plugs and a whole new harness (assume this means electronics also changed to delphi)
Ie. 2008 GV250 Had SENTEC ECU with sentec marked electronics vs a 2016 that had DELPHI and everything else was delphi branded
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is this it?Looks like it !
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Just did a test run, 30km and can confirm thi was the cause of my issue. Furthermore it doesnt stutter when decelerating anymore (it was very rough prior to repair, so much that i stopped breaking with the engine) It’s a different ride now, love it even more. Once again thanks Marcel for shareing Your knowledge 🙂
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Just did a test run, 30km and can confirm thi was the cause of my issue. Furthermore it doesnt stutter when decelerating anymore (it was very rough prior to repair, so much that i stopped breaking with the engine) It’s a different ride now, love it even more. Once again thanks Marcel for shareing Your knowledge 🙂
You are welcome! ❤
Enjoy her now 🙂
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