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I dropped my zx12r b2h off its stand. That's were it all began!. The choke stopped working was first sign something weren't right. It was sputtering, fluctuating tick over, cutting out and backfiring when coming to a stop. Running mega rich blowing loads of black smoke out of exhaust. At a constant 80, its stopping itself like you're stamping on the back brake. On acceleration its sputtering then clears, like your caning your bike with choke on. Mods on bike include pc3usb. K and N, quickshifter end can and catalytic thing took out of end of exhaust.
Took it to a dynojet specialist and main dealer. When they got round to doing it they said it was running fine. Cleaned some connectors, changed oil, remapped it (slightly unnecessary but I did ask for bottom end smoothing out.
I picked it up and it ran ok for first ten mins then problem came back. It's never run hot and no fault codes showing.
 

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Check/replace your air filters and remove the PC, the bike doesn't have a choke so thats not an issue all you have is a fast idle control.....
PC's are well known to cause trouble so easy place to start.....failing that read Hubz's post...but be warned you need your wits about you.
 

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Maybe a stick coil popped loose.
 
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