I'm running a 125cc grom. I don't plan to big bore at all. So would the oil cooler be worth it? I run the bike hard through some canyons and around town. The rpms I hit are around 7-8rpm at times, and I notice that overtime the engine is losing power. I figure it has to be the oil temp that's causing the loss in power. So is it worth it to buy a oil cooler for the stock motor?