2011 EC250 Died

[Connorscotland]

Hello

Bought this from a member on here

2011 EC250

Just been fully rebuild, barrel replated, wiseco piston, carb rebuild

It started fine when I bought it
I ran it up my garden

In the morning started first kick and I ran it down the street at about 20mph nothing mental it then spluttered, internally backfired and died

It?s getting a spark
I?ve removed the carb, jets and cleaned it all
Checked the floats
Checked cables to cdi unit
Changed the plug
Changed the fuel
Tried bumping it (just bogs and doesn?t give anything)
Removed the manifold and there was a few spoonfuls of fuel(black)
Left the plug out and kicked it over a dozen times
It you kick it on full throttle it will backfire occasionally
Tried a spoonful of fuel down the cylinder with the fuel off and nothing
Checked the piston and liner as much as you can and it looks Ok
Seems to have compression

I?m at my wits end with it, absolutely gutted I?ve just got it and this has happened.

Going to drop it to a bike shop Tuesday but ideally would
Like to sort it myself