I need your guys help finding a air leak on my new 66cc! I've Been riding my new MB build for a couple of days now,I hear a whistling sound coming from somewhere on the engine while going about 15 mph.When I first got the motor the seal on the crank shaft where the case splits,a hairline piece of gasket was missing so I used a bit of RTV Silicone on there.I haven't tried carb cleaner to check for air leaks yet and don't plan to as it would remove the paint on my motor..What do you guys suggest I do/check here? I'd appreciate any advise thanks!