This head has been designed to help you obtain maximum performance from your YS.91 Engine. The Viperhead dual glow plug version is a high compression head which accomplishes 6 things.
1. Increases Power, 2. Better Cooling, 3.Improves Combustion, 4.Smaller Size for ease of installation, 5. Improves Sound, 6. Eliminates unwanted dead engine autos.
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