Get checked out: Blood in the phlegm can have a lot of causes: some benign, others not as much. Especially if you are a smoker, any blood in the phlegm is not normal. The best thing is to see your doctor: get the blood in the phlegm and the pain in the kidneys checked out.
Four Cylinder Engines. The four cylinder engine is just like the three cylinder engine only it has the additional cylinder and therefore weighs more. As is true of any engine, more cylinders equal more power and smoother sailing. It is important to consider how much size and power you require in your motorcycle.
Enduro bikes combine the long-travel suspension of an off-road motocross bike with engines that are reliable and durable over long distances, and may be fitted with oversize gas tanks for adequate range. Some enduro bikes have street-legal features such as headlights and quiet mufflers to enable them to use public roadways. The engine of an enduro bike is usually a single cylinder 2-stroke between 125 cc and 360 cc, or 4-stroke between 195 and 650 cc.