Multiquip 912239009 Engine - OEM Replacement Part for Vibratory Roller

This Honda GX390 series engine assembly serves as the complete power unit for the MRH800GS vibratory roller, delivering 11 HP (8.2 kW) net power at 3,600 rpm in accordance with SAE J1349 standards. The air-cooled 4-stroke, single cylinder, OHV horizontal shaft gasoline engine features 389cc displacement with an 88mm x 64mm cylinder bore and stroke configuration.

The engine operates at 2,500 rpm during roller travel operation and includes electric/recoil start capability, oil alert system, and either standard or cyclone air filtration depending on the specific model variant (GX390K1SM32, GX390U1SM32, GX390UT2SM32, or GX390UT2SCM1). Fuel tank capacity is 1.61 gallons (6.1 liters) for unleaded automobile gasoline, with oil capacity of 1.2 quarts (1.1 liters). The engine weighs 69.4 lbs with dimensions of 15.0" x 17.7" x 17.4".

This complete engine assembly powers both the travel system and electromagnetic clutch for the vibration system, which operates at 12V DC with rated torque of 25 Nm (2.5 kgf-m). Regular maintenance includes oil filter replacement initially after 25 hours, then every 500 hours using genuine 10 micron filter paper.

Compatible Models:

• MRH800GS

Genuine Multiquip OEM part, sold by an authorized dealer.