This BZx4 Ultra Engine Modification includes the Zenoah G260PUM & the Walbro WT-257 Carburetor. Adds an approximate 10-15 MPH increase over the stock Zenoah G260PUM. Proven performance and reliability. – actual performance based on your boat, prop, pipe, weight, etc. Includes: BONZI BZX4 RACE ENGINE: raised exhaust timing and enlarged exhaust port, port matched intake manifold, machined lightened and top relieved piston, two oil grooves for lubrication at high RPM, increased intake volume in jug, modified flow direction, jug base machined for increased compression, zero drag seals, Walbro WT-257 big bore carb, BONZI “Very Cool” Water Jacket, Stainless Hardware Kit and BONZI carb velocity stackand NGK CMR7H spark plug! 6.0HP@16,800RPM Contact us with any questions.
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