BZ1 MOD Looking for an upgrade? The BZ1 adds reliability and better fuel economy to your stock engine. With two oil grooves cut into the piston, this mod helps prevent galling. This mod also includes an advanced exhaust port timing; an advanced intake timing; a flow-ported exhaust; increased compression, and additional piston clearance. It comes with a Walbro WT-644 Carb but can be upgraded to the WT-257, WT-813A, or the WT-1048 for an additional cost. 4.5HP at 16 200 RPM (with a G260PUM)
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