I would firstly check the air filter for blockages, if its very dirty then replace it. Also try altering the choke settings (if it has one) as it could be flooding.
If it was new last year I would think that the spark plug is OK. If you can remove it easily then it may be worth checking to see if it's gummed up, clean it up with wire brush and white spirit.
Regards
Nick.A
April 2006