CRX

CRX engines are available with either recoil (manual pull) or electric starting. Recoil-start models, such as the 4.2 hp CRX165 and 6 hp CRX225, use a pull cord and do not require a battery or charging system. Electric-start models, such as the 19.4 hp and 21.4 hp units, include a starter motor and typically require a 12 V battery and associated wiring. The choice depends on the installation: recoil start is simpler and lighter, while electric start reduces operator effort and is often preferred on larger engines or equipment with remote starting needs.

CRX horizontal engines are offered with several shaft diameters and end configurations. Smaller models (around 4–6 hp) commonly use a 3/4 in diameter shaft with a tapped 5/16-24 UNF-2B end or a 4.75 mm x 45.5 mm keyway. Mid-range models (12 hp) use a 1 in shaft with a tapped 7/16-20 UNF-2B end. Larger models (19–32 hp) use a 1-1/8 in shaft with either a tapped 7/16-20 UNF-2B end or a keyway (6.3 mm x 78 mm or 6.3 mm x 88 mm). These interfaces determine how the engine couples to pumps, generators, or other driven equipment.

The CRX engines in the 3G Electric catalog span from 4.2 hp (7.3 ft-lb gross torque) to 32 hp (52.3 ft-lb gross torque). Intermediate ratings include 5.7 hp, 6 hp, 12 hp, 19.4 hp, and 21.4 hp. Gross torque values range from 7.3 ft-lb to 52.3 ft-lb. These ratings are typically taken at a specified engine speed, and the exact torque curve should be confirmed from the datasheet for the specific model. The range covers light-duty applications up to heavier industrial drives.

Most CRX engines listed in the 3G Electric catalog include a muffler as part of the standard configuration. The muffler is a spark-arresting type on many models, but the exact exhaust configuration and backpressure characteristics should be verified from the engine datasheet. For enclosed applications, additional exhaust piping and ventilation may be required to manage heat and emissions. CRX engines are air-cooled, so adequate airflow around the cooling fins is necessary regardless of enclosure.

CRX engines follow standard small-engine maintenance practices: regular oil changes (typically every 50 hours or per the manual), air filter cleaning or replacement, spark plug inspection, and fuel system checks. Service parts such as filters, spark plugs, and recoil starters are available through 3G Electric. Because maintenance intervals can vary with load, duty cycle, and environmental conditions, the engine's operation manual should be consulted for the specific model. 3G Electric can provide part numbers and availability for common wear items.

3G Electric supplies CRX engines in the configurations listed in its catalog, which include various shaft diameters, tapped ends, and keyway dimensions. If a required shaft configuration is not listed, 3G Electric can check availability from the manufacturer. Custom options such as special oil sumps, air filters, or exhaust systems are generally not available as factory modifications for this line. For applications requiring a non-standard interface, an adapter or machining of the driven equipment may be necessary. Contact 3G Electric with the required specifications for a quote.