Plywood baffle precision-cut to the cylinder layout and cowl geometry of the UMS 77–90cc 7-cylinder engine. The baffle acts as a physical divider inside the cowl, forcing incoming ram air to flow directly over and between the cylinder heads and cooling fins rather than taking the path of least resistance through open cowl space. Effective cowl baffling is one of the most important factors in maintaining consistent cylinder head temperatures — an unbaffled or poorly fitted cowl allows hot air to recirculate around the cylinders, creating localized hot spots that accelerate wear on valve guides, piston rings, and cylinder bore surfaces. This baffle is cut specifically for the 77–90cc variant and its cylinder spacing — it is not interchangeable with baffles for other engine sizes even within the same UMS engine family. Install with the cut edges flush to the cowl interior surfaces, with no gaps at the cylinder head fins that would allow air to bypass the baffle.
Part Name: UMS 77-90cc Baffle
SKU: UMS-BAF55-4
Material: Plywood (precision-cut)
Compatible Engines: 7-77CC, 7-90CC
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