SINGLE CYLINDER BALANCE SYSTEM

A balance system for a single cylinder engine (10) is described. The single cylinder engine (10) generates forces, that if left unbalanced, cause significant vibrations or movement to the single cylinder engine (10) and devices driven by the single cylinder engine (10). The balance shaft includes a primary balance shaft (21) for a first type of forces and at least one secondary balance shaft (23) for a second type of forces. The secondary balance shaft (23) is driven directly by the primary balance shaft (21). In one example, only one secondary balance shaft (23) may be used, which may leave some forces unbalanced but is more space and cost effective. In another example, two or more secondary balance shafts may be included in a drive chain such that one secondary balance shaft drive the next secondary balance shaft.