Engine Radiator Maintain

I NSR150 SP engine radiator mantain. Normally Engine heat need water take it out of cylinder. And use radiator effusion heat.

That is, 

air need across radiator fin and take heat out. 

When radiator fin doesn't regularly and has gap between each fin. The heat will not effuse efficiency.

For example, below is used radiator. The fin has damaged by stone.

After maintain. The fin has more regularly than before.