Check the listing for details. Zenoah Modified Engine 32cc PUM Pro Mod Redline. Condition: New. Listed at 575.00 USD. This Zenoah Modified Engine is a 32cc. This engine has all of the torque and RPM you need and a whole lot more! This engine is set up for heat racing. Mods include increased compression, raised exhaust timing and reshaped and enlarged exhaust port. The transfers opened up and reshaped. The intake opened up and timing changed. The piston has been lightened and the excess material from the inside has been removed via CNC machine, top of the piston has been relieved to prevent piston seizures and skirts trimmed on sides to enhance the transfer flow. The Walbro WT-257 Modified carbeurator bored out and entry angle reshaped for better flow. Now with Zero Drag Seals and Aluminum isolator block and a NGK spark plug installed. Motors run around 14.50+ hp max HP at 16,500k rpm range with 4.50 ft/lb of torque.