DRR 90 wont start?

[phaded23]

I have a 2007 DRR 90 that my 6yr old son is racing...the other day took it out for a practice run and ran fine for over an hour and half...was getting ready to leave and told him to make a couple more laps and on the back stretch the bike just quit like it lost all fuel or fire....checked both fuel and fire and its getting both...Any clue as to what this could be? this is our first DRR so we are still learning about them lol....I found that my coil cap on my plug was a little loose so i replaced it and still wont start. Please help...Thanks

I haven't checked compression yet but it kicks over just fine and seems to have plenty

[Tim kapopoulos]

If you have spark at the plug electrode when grounded and you have fuel going to carb your missing the last element for combustion , compression . I would check it .

[dewutfan]

Had the same thing happened when kicking it felt good but after checking the compression .. well that told the story .. rebuilt top end .. first kick and it was running.