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.
A smaller model with a 250- to 300-cc engine can make a great starter or commuter bike. If you plan on doing a lot of highway riding, you might want one with an engine in the 500- to 750-cc range so you can easily keep up with traffic. (Before buying, see our report on motorcycle reliability and owner satisfaction.)