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Many Clone engines have electric starters options, so the blower housing and flywheel fan shroud are made into two separate pieces. The two pieces make it easier to make different models without creating two different blower housings or multiple blocks.
The other purpose of the flywheel shroud is to prevent moving air from escaping at the block's front. The air is pushing by the flywheel fan is guided to the jug and underneath the block. Or, in cases of the new Tillotson Reinforced blocks, the Flywheel Shroud is intergraded into the block for added rigidity.
The Sheet Metal Flywheel Shroud is OE on the older block Tillotson 196R and 212R Engines but can but used on other 196cc 6.5hp Clone, Honda GX200, Ducar 196, Ducar/Tillotson 212E, Predator 212, and BSP 196 and 212 Engines.