Just bought a 2004 650 V-Twin, did an oil change, got the carburetor rebuilt, cleaned the air filter, I also got the cooling system checked to make sure it was working properly. The machine just seems to run really hot, like so hot the plastics on the left side have melted in some places, the exhaust that came on the machine are some "custom" ******* setup, my mechanic told me the exhaust is causing an issue where I'm not getting enough back pressure. So I ordered an OEM exhaust system and am going to change it. Just wondering if this is normal for the engine to be this hot? Could the garbage exhaust system be causing this?