Help whith kick start on honda ns 125?

Hi,i got a motorbike of ebay and have problems kick starting it every morning.It is only kick start not electric.Every morning i have to bump start it.After i have bump started the bike it goes ok untill i switch engine of for over 1 hour then i have to bump start it again.The battery is fine,Replaced the spark plug twice.Engine cut of switch is on run,In neutral.Has anybody got any ideas??thanks

How do i check the compresion???

I take it that the choke is working ok?
When the choke is on, do not twist the throttle open as you kick the engine over, as this will bypass the fuel enrichment circuit, effectively making the choke inoperative.
Many people seem to do this, its as if they have a piece of invisible string connecting their knee to their elbow.

If in doubt, let go of the throttle grip altogether as you kick.

it could have high compression, which will make it really hard to start after it has been sitting

When you take your plugs out, what colour are they? This could give an indication of dodgy fuel/air mixture. Sooty black is too rich, brown burnt is too lean. Ought to be greyish colour. Is the electrode wet? Might be a weak spark. Get a manual and check plug gaps. Check your battery with a voltmeter. Is it charging properly? Should measure about 14 volts across battery with engine running (assuming bike is 12v). Get a manual.

There is an art to kick starting a motorcycle. By the sound of things the bike seams to be OK as it does start on a bump.
First thing to check is the spark plug. Take it out and replace it with a new one.
Second check the HT lead, make sure it is not damaged in any way. If it is replace it as well.
When it comes to starting a bike on a kick start you need to do the following;-
Turn the fuel **** on.
Stand the bike straight up.
Give the throttle a couple of turns.
Open the kick start leaver.
Putt all your weight on the kick start and give it have huge kick.