C400GT starting issue (Intermittent)

[Prozac the Cat]

Hi Everyone,

Wondering if any has had the same issue or can help? So I have a 2019 C400GT, love it! has 8K miles on her.

The problem is that she will often turn over when trying to start and continue to do so, but doesn't even attempt to start. Now happened about 4 times. She is kept garaged, temperatures have ranged between 2c and 12c. Other times start perfectly within 2 seconds of pressing the button. I did think it was a safety feature as previous times I had moved the scooter out of the garage and had to jiggle through a gap between some cars before trying to start. But today went out to install the auxiliary lights and before anything tried starting her. On centre stand, brake lever pulled and turns over, but doesn't fire.

Got her onto the drive, 10 minutes into doing the lights dash came up with low voltage warning, pulled lever and pressed start and she just fired up beautifully?

So:
- Side stand up
- On centre stand
- Ignition on
- Brake level pulled
- Plenty of battery (will turn over constantly just not fire, no dipping of brightness to TFT or lights.)

Any ideas?

 

[jokerface]

Hi, have you tried this?

 

[mgg]

If this happened to me the first thing I would check is to make sure the kill switch is off. The second thing I would check is to make sure your fuel pump is working. (You should be able to hear your fuel pump turn on when you turn on the bike.) The third thing I would check is that my spark plug wire had a good connection to the spark plug. You can tell this by giggling it at the plug end. If it starts after you giggle it that is an indication that it is loose. I have one of those OBD readers so I would connect it and try to crank again to see if it gave me any codes. I got nothin after that so to the dealer it would go.

 

[Ceesie76]

Could be one of the starting inhibitor/safety switches with an intermittent fault. I know you say sidestand is up and brake lever is applied, but if one of those switches is on its way out, the bike won't start when it is acting up, and will start when it's good again.

 

[Ceesie76]

Actually I think my suggestion is incorrect: if one of the switches is defective, the starter won't spin - but yours does, so that can't be it. If you can get to the spark plug, remove it to see whether it is wet with fuel after having tried to start, and whether it is actually sparking. If dry, then fuel delivery is the problem. If wet and you have no spark, then the ignition is the issue. If you have both fuel and spark, then engine timing could be off or there is lack of compression due to some other reason than bad timing.

 

[STiago]

Mine used to start then die, restart and good. I started to act bad after a while and died for good. BMW replaced crank position sensor and after that its not doing that.