Thought I might share my experence with my beloved 2018 vstom 1000 (17k kms), about 4 weeks ago my bike did not start on the button after 10 days in the garage unused but fired up when using old way of holding in the clutch and pressing the start button. I took note that the battery might be on the way out ( 3 years old).
So yesterday I pressed the button but no start, tried pulling in clutch and it turned away but no start, charged up battery but still cranking with no start.
Off I went in the car and bought myself a new battery which I then installed with great confidence thinking I had just to press the button and engine would roar into life alas no still the same. I trickle charged the new battery over night but still the same this morning - I was now starting to read up on what could be wrong.
I was going to strip down all the panels to see if I could see any thing wrong but instead I took out the left front plug and earthed it with a bit of wire and turned over the engine - it was sparking away - also it had a smell of petrol ?? After a bit of head scratching I cleaned the the plug seen as I had it out and reinstalled. I again tried the button only start and it just cranked over still no start. I then pulled in the clutch and pressed the start button while open throttle up full - engine roared into life Ah happy days. Now before anyone says I should have tried throttle open first I did a few times but maybe a bit timid.