Another milestone problem.

It was a good weekend for riding, cold but dry, I did another fuel usage test and came out with 25.3 kms per litre, I also found out that my tank only holds about 6 litres? sure it should be 7.7, I almost ran out of juice, the level was about an inch above the bottom and when I topped up I put 5.5 in.
On the way home I have a reasonable hill long and continuous grade and I sat on 80 the whole way up, at the top I clutched in and cut the engine and pulled over to have a look at the plug, not as brown as normal, but more of a grey colour, dry and clean. This is where the problem started, I put the plug back in and kicked it into life, she's been a 2-3 kick start since being back in one piece, three this time from a hot start, odd. I had only 200 metres to home so I putted back, In the property I was down to second and just bleeping it to roll round to the shed, I noticed it was running rough.
This morning I must have kicked it 10 times before I got a response, another 3-4 before she started and there was something not right, like she was firing out of whack, mostly running OK but every so often it would skip and be a louder, I didn't have time to go any further into it because I had to leave for work. So I'll have a play when I get a chance, I think the cause may be from when I cut the engine I held the kill switch in for a bit and this may still be contacting while the vibration of the idle shakes the crap out of the bike. It's been running fine and this is the only thing that has been different.

The milestone was 5000kms on the clock, 600 on the new kit, I'm half expecting that she's angling to get back in the shed since it's getting colder, she's not a morning bike for sure.