Join Date: May 2017
Location: Hong Kong (is not China)
I Ride: 2014 ZX-6R 636
In my opionion, if the dealer did what they say, "changed the ECU multiple times, changed the throttle assembly, fuel injectors" that pretty much eliminated all electronic problems. If the spark plugs are new (which may or may not be), then the only thing left is
fuel (switch brands/octane? see below)
Engine problems (worn out rings/cylinder causing bad compression). Unlikey, given the low miles. If it rides OK in cold/hot, then there's no engine problem)
Other overlooked mechanical problems? (exhaust flaps? PCV? EGR? Evap? Airbox flap?)
Swapping ECU require pairing it with your key's immobilzer chip? If you are thinking of swapping it yourself, how are you going to do the pairing?
I bought my ZX-6R 636 in Feb 2014. Now it has 12,500km completely stock with same spark plugs and air filter since the day i bought it (I don't treat her good, I change the oil every 5,000km(3,000 miles) and I run cheap truck oil CI-4 15W40, No Rotella here). Where I live, the temperatures range from 5 celsius(41 f) to 35 celsius(95 f) and there is only 93aki gasoline.
I often give a bit of thorttle when thumbing the start button, because I realized it's slightly easier to fire it up. It was behaving like this first day I bought it brand new from the dealer.
In cold temperatures, about 11 celsius(51 f), although I don't have your long cranking problem, it does run rough for the first few seconds, just like your bike in the video. I don't wait for the engine to warm up and ride it easy straight away. The throttle response was slightly slower, the revs not as smooth/crisp, but these goes away after 5 minutes of riding, just like my car.
When the bike is fully warmed up, and i need to restart it (such as after a short break in the twisties) My bike must need some throttle when thumbing the start button, or it will never start. It was behaving like this first day but I never consider that to be a problem.
I just watched your video.
How long did you own the bike for?
Have you tried giving a bit of throttle when thumbing the starter?
In what temperatures does your cold start issue happen?
Does it also do it in the summer (what is the summer temperature)?
What kind of gasoline are you getting? 91 or 93?
Try switch different brands. Also If you've been fueling 93, try 91. It can run 91 no problem.
In really cold temperatures, running a slightly lower octane actually helps combustion, but never lower than what the manufacturer stated.
Apart from long cranking when cold, when it finally starts, do you ride it straight away OR do you let it warm up a bit? Either way, how does the engine respond when you ride it? Does it stumble/hesitate?
2014 BMW 118i (F20) Dads, 2014 ZX-6R 636 mine, 2008 PGO Gmax 200 mine
Bike:08 LF-125>92 Ninja 500>14 ZX6R 636, 08 Gmax 200 Car:93 Mitsubishi Expo 1.8>96 Renault Clio 1.2>13 BMW 118i
Natalia Starr, Keisha Grey, Alexis Adams, Kasia, Jinx Maze, Aspen Reign, Layla London, Mia Khalifa