Customer wants to replace his cylinder head after having engine overheat. As a technician giving an advice about this matter if the engine detail are bore (7.5 cm), stroke (8.3cm), gasket thickness (2 mm) and old cylinder head (53 cc) and new cylinder head (41cc).

1. Name type of engine and his advantages.

2. Calculate engine displacement.

3. Calculate the compression ratio.

4. Give a comment the above engine.