Morning all. My son's got a 2010 YZF r 125. It's been SORNed since H14, so off road for about 2 years at his base. Brought it home about 6 months ago, had a quick go at starting it and it started first time. It's been started a couple of times since. Last night however, it failed to start, battery ran down, and we tried it with jump leads with still no joy. Engine turns over. Spark plug appears dry. Question: Should it be able to start with jump leads? And is it likely that the petrol's just gone off and needs renewing? Thanks, in advance, for any help.