YBR 125 Turns over but dosn't catch + Video: SOLVED

[DanteKrys]

Video of the issue-YBR125 wont start: https://streamable.com/req38

Hi,
The issues started about a month ago. The bike was difficult to start from cold but it would finally start (cold weather). Then the engine would turn off when stooping at lights (I had to keep hight revs). This tend to happen like twice a week ( I do like 70 miles a week). Then today the engine tuned off when I was stooping at a junction. So I started the bike and drove to the side of a road. I added oil engine the day before and did some chain adjustments. At the side of the road, I turned the bike off to check the rear brake (had to loosen it a bit). After that, I started the bike, It turned over but stooped after a while (4sec). Then, I started the bike again, it tuned over but stooped after few seconds. So I tried start the bike till the ending would not turn over at all.

I bought a new spark plug. It feels that It is about to engage but nothing happens. From cold, gears are difficult to change. The bike only starts from neutral (Before A month age I could start from other gears)

PS. Few weeks ago when it was cold. The bike would do the same, but after many trials it would start. Now, if I hold it for longer time it sounds CHUGCHUGCHUG then makes noise like the engine half engages then continues CHUGCHUGCHUG and so on. Spark plug should work fine, at least outside .There is a flicking blue spark.
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Ybr125

[DanteKrys]

HI,
Found the solution. I wanted to check the old spark plug so I removed the new one. The moment I removed the spark plug cap something fell from the inside. The screw lead for the plug was unscrewed. So I screwed it back using the spark plug. Then I inserted the old spark plug into the engine. And wallah, it worked. I reply because people tend to not to reply once they find the solution.
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Ybr125