Is it ok to cool cilynder on only one side??

[padly1995]

Hello, i literaly fitted tomos a3 engine on keeway scooter. The problem is that this engine is air cooled with no fan and the problem is that plastics on scooter are blocking airflow towards the cylinder.
However tomos also build those apn mopeds that have fan cooled engines and magneto on a3 is the same. So i want to fit a fan on my a3 engine, drill a big hole in the engine cover for air to come in, cut a hole from cover towards the cilynder for air to blow out and fit a piece of metal and bent it towards the cilynder.
But only problem is that i dont know if is ok to force cool cilynder on only one side?





Thanks for anwsers!