Reply To: Bike won’t fire cold but it fires once working = GT250R 2012
I hate to be the legend that upsets you but slowly , investigate the stator (drain oil first) – I believe it would be a good idea to get a new good stator.
Also replace that regulator. never trust a regulator that is not a real japan mosfet shingden on EFI bikes because there is too many sensors that depend on a very stable voltage.
Stator = I had a 3 customer bikes in the last few years where stators where the reason bikes did not cold start properly and i had to replace everything else on the bike, i did not realize the stator was fault.
Bike 1 & Bike 2 = Wrong stator fitted.
Bike 3 = Pulse sensor went haywire.
A carb model will get away with a bad stator and bad regulator for a while (in limp mode) as it’s just only worried about a CDI unit.
So yeah, lets go to the stator and regulator unit. Keep your old one for purely emergencies but i doubt you will even need to worry about it as a true mosfet shingden regulator will last years and years and years , I still have the same one my bigger GV EFi model. Everyone knows getting a Daewoo ECU for the GV650/GV250 is like going to war! No gold to be found for 99% of the earth. The regulator was needed to be upgraded even with an inline fuse to avoid electrical spikes to it.
Bike wont start without a stator anyways , it’s the 1st object the bike looks for before triggering anything else. If it starts when warm , but refuses after its cold , check how much battery has drained (if 12.9V in the morning , then check overnight how much voltage was lost)
Get your mechanic to do a “LOAD” test on the battery too using a special Yuasa Analyzer (usually mechanics or garages keep this)
& yes , Hyosungs have a character of their own! Must be a Korean thing!