I have just purchased a lovely dt125r, it went lovely for the first few weeks or so but recently when i have been riding along everynow and then the bikes seems to cut off the fuel like it is starved! i cant even rev it as i am slowing down but when i come to a stop i kick it over for about 5 minutes and it will start again! the problem is it has got a lot worse recently and is happening all the time!! i have changed the plug and have got compression!! can someone help please!!!

might have a bad fuel cap not venting. Next time it happens open the cap and see if it starts any quicker or pull the fuel line and check for parts. Watch for hot exhaust and engine parts with the fuel.