broke down

i waz driving my scooter home from swansea and the bike started 2 jerk and the cut off so i thought it waz the spart plug so i went2 halfords a bought 1 put it in and nuthin then i started 2 kick start the bike then a few days later and there waz black smoke cumin out of the exhaust so i dont a have a clue wa it is

can some 1 help me plzzzz
beefy suzuki kantana

 

have u got stroke oil in there and also dod i check for compression

 

it's called two stroke oil and you should have put some in your ped about 20 miles before that happened.