Strange cooling issues .

[B10Hazard]

Okay iv got a d125 r .
I keep having to top the rad up.
I do 65 miles a week on the bike and every sort of three or four weeks i have to top the rad with water/antifreeze. My temp gauge will just slowly get higher and higher until i have to top up.
Now i cant detect andy leaks ..
Im thinking this, the top off my rad has a seal and seems a little worse for wear, could it be evaporating ?
Or any ideas will be cool
I cant think off anything else.
Also if iv been getting a little happy with the throttle and riding a little fast it seems to need toping sooner, this is why im thinking its evaporation.
Thanks Dan
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Current bike .. The police stole it
No longer any socks
Let me take you on a trip . . let me show the world in my eyes.

[TheDonUK]

My hornet did that following some rad damage, soon after the engine seized...

Is there any white shit building up near the cap?
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[Current Bikes - GSXR-750 K5 & C90-97 ] [Previous Bikes: Runner 125, YBR 125, GS500, Bandit 600, Hornet 600, ZX6R-99, C90-99, R1-99, XT600E-04, GSXR-750 K4, CRF250L '16]

[B10Hazard]

No, theres nothing.
Rad Damage ?
Explain . .
My rad looks in very good nik
____________________
Current bike .. The police stole it
No longer any socks
Let me take you on a trip . . let me show the world in my eyes.

[Omega]

If you really can't find anywhere that the water is going then it could be the head gasket.