Reply To: Bike only runs on one cylinder once moving – 2009 gt250 carby
You should replace those suspicious plugs with CR8E if that was what the previous owner did , then stay on CR8E forever as it’s the OEM plug , don’t fit “IX Iridiums” as they don’t like them for too long (Stock or LASER CR8E is best)
See what happens then, also if it dies when spraying the rear, you have a small air leak, the metal throttle bodies have 3x orings per cylinder (3x front and 3x rear), so if you get time, I would recommend stripping the intake system down so you can get to those O Rings, even old o rings can cake up due to old age rubber (it’s like having 20yr old tyres on the bike, you will start to see expansion cracks everywhere.
We should have a happy bike after this , as its only 2,000 miles old. So i am not expecting any electrical issues at this point but worth checking , and if you see anything oxidized like “rusty connectors”, just give them a clean with contact cleaner.
When it comes to the ECU = Do not spray any liquids, always use dry compressed air on the ECU socket plug, it will thank you. Clean electrics should translate to a snappier bike overall