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CAT5 Mfg - 28.5cc Race Ported 4-Bolt Engine (Zenoah Cylinder)
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CAT28.5Ported
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Out Of Stock
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Detailed Description
This motor features a Zenoah 36mm 4-bolt cylinder mounted onto the F230 crankcase. The Zenoah cylinder is used on this motor due to the high quality cylinder plating and the F230 crankcase is used because of it's large transfer port openings. The cylinder ports have been modified, reshaped, and enlarged for greater performance. The cylinder and crankcase have been port-match machined for optimal fuel / air delivery. This allows for larger transfer ports for smoother delivery of fuel & air to the combustion chamber. The piston ring groove has been modified (releaved) to resist lean seizures due to piston head expansion. This motor is rated at 4.25+ HP. This is an excellent motor option for the person who really likes to go fast. Engine comes with WT-668 carb and clutch with 8,000 RPM spring. ***Due to the high performance of this engine, we recommend that you use 91+ octane gasoline or racing fuel up to 116 octane.*** (This engine is also available with an optional lightened piston. For details on the lightened piston option, call our shop at 219-253-8356.)
Carburetor Settings: Low Needle 1+1/4 turns, High Needle 1+1/2 turns
Recommended Oil: Klotz R50 Synthetic 32:1 Ratio (4 fl.oz. oil / 1 gal. gasoline)
Engine Options:
Lightened Piston: These pistons have been CNC machined to be lighter, and better balanced in the cylinder. These pistons are 20% lighter than stock. A lighter piston will allow the engine to spool-up faster and rev higher than with a stock piston.
For more performance, add the WT-257 carb, velocity stack with choke, and a tuned pipe.
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