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Your problem is that your valves are not properly adjusted; had the same problem on my 1985 Ninja 600 - the colder the ambient temperature got the harder it was to start. After a valve adjustment it fired right up even in freezing temperatures very reliably.
if the valves hit the pistons the cam timing out way out. Even a slight touch between the piston and valves can bend the valves, you may be able to confirm this if the valve clearances are too big, the head may need to come off
usually it is either rings or valve seals. I would guess rings. But you can do a compression test to proof if out. run your first test die and add a teaspoon of oil on the second test. If the compression amounts are the same, then its probably the valve seals. Good luck.
Here is the detailed instruction you needed. Is about changing out cam, but the valve adjustments and all the torques and clearances are there. Thanks for using FixYa. Any dramas, get back to me. Cheers