Reply To: Bike not working
If it is a carb model (earlier than 2008) , then the issue likely will be either:
Wanning Stator (the pulse sensor may go haywire and the bike can’t run without it)
HT Caps = too common , so we tend to upgrade to NGK ones and forget.
Coils = There is a service manual on the forum that your mech can download to confirm the resistances in primary and secondary are within OEM range , unless the coil has internal failures (likely caused by the failing HT cap or sparks arc’ing out of it) , try to make sure he puts a good coil there.
Plugs shot ? = Try fresh CR8E plugs to confirm, if the bike uses anything other than CR8E or CR8E LASER , it will make sure you get stranded, they dont like “IX Blue box” plugs (Iridium IX ones , not to be confused with the trusted Laser Iridiums)
Check the Regulator is in spec (#2 issue that is common, so unstable charging may make things haywire , if you see a chinese regulator, toss in bin and get Japan SHINGDEN MOSFET ones like the ones you see on this site , if your mechanic can do it himself , he needs to be aware of fakes out there)
If there is 3 things on the electrical side every 650 owner should do , would be NGK caps , Shingden RR & Good plugs.
Real OEM coils for the 650 (original) are made by Mitsubishi Japan and share with other suzuki bikes of the 90s , but Hyosung has since changed them to either Hankuk Korea (they are OK-ish) or Delphi (later EFi models)
Hopefully above ^ should fix it as we don’t want to replace the CDI or other black boxes on the bike as those are not made anymore, so do all you can to preserve it!
Good luck