Hello friends, I drive a NMAX 125 BJ. 2015. I bought it used at the end of last year with approx. 15,000km. The first owner had always had all inspections done etc.. I myself drove in the time when I have it about 8 tank fillings. Mainly for the daily work path. Now the NMAX went out at speed 100 last week on the country road suddenly. As if I had turned the ignition caps during the ride. I let it roll first and at speed 10km/h (no one was driving behind me) I hit the ignition again and pressed the start button. He then drove 1.5km further than nothing had been. Since I had only one line on the tank indicator, I drove directly (the said 1.5km) to the gas station and filled the tank. After paying he jumped perfectly and immediately. Another approx. 2km of highway he went out again and did not hit any more. I rolled a few times until the battery then into the K After work I was driven home and then picked up the NMAX with the trailer. Currently it is in the garage. The battery is a 12V 6Ah which I had overnight on the charger. After I had installed it and wanted to start it, it was flat again quite quickly. After another 24h charging process I attached it again and at the same time a As soon as I press the start button, the battery is tormented and immediately drops to 5V. So I thought it was due to the battery (although the scooter, according to my assumption, should not go out during the ride because of a weak battery). I ordered the same battery at Polo and installed it today. Result: The NMAX still doesn’t start, but the battery has enough power to run for a few seconds, just jump In addition, I have done the following: New spark plug installed, the old one was somewhat worn out, but otherwise dry and still functional, which also confirmed an expansion and check of the spark. Also with the new spark plug no chance that it starts, spark radio here absolutely impeccable and even. #Zündkerzenstecker entstandet und mit dem Multimeter messen – Resistor at 4,86 Ohm. #Zündspure removed and measured – Resistor at 11,03 Ohm. #With your finger held the spark plug opening – compression is noticeable, even on the exhaust when you hold down the start button #The injection cable unscrewed and actuated ignition – it releases fine fuel fog and smells after it #air filter box degraded, there was light smudge in a corner that I wiped off and had the air filter lying in the sun for a whole day. NMAX didn’t jump on even with removed air filter Now I am first with my Latin at the end. I have certain screwdrivers skills, but they are based rather on my youth and especially on 2 clocks. My question to you: How would you proceed next? I have seen that beside the CDI there is a kind of maintenance plug installed. For this four-pin plug I would probably need an ODB 2 diagnostic device (for ́s car) with a suitable adapter plug for Yamaha motorcycles. Can you read anything with this on a scooter and would be such an Au To ODB 2 diagnostic device compatible with said adapter plug? Motor light on the display or similar is not visible. Only this ABS lamp which always runs out after a few meters. It seems to be all right and yet the good ones don’t start. Would be cool if someone knows something and maybe gets me on the right track. And I hope that it is not a defective CDI, which costs almost a third of the purchase price of the scooter… Thank you for reading this long text!