What size piston is a GX390?
88mm
Product Description. Replaces Honda: 13101-ZF6-W00, Fits Honda: GX390 and GXV390. Standard Piston Size, Cylinder Bore Size: 88mm, Use with 500-245 Piston Rings STD.
What is the standard gap on a piston ring?
Most piston ring manufacturers recommend a minimum end gap of . 004 inches times the bore diameter for the top piston compression ring. So for a 4 inch bore, the standard end gap would be . 016 inches.
Do piston rings need gapped?
Gapping the piston rings is important to the performance and reliability of the engine. Piston rings expand as the engine comes up to temperature. Too big a gap and the ring won’t expand enough causing too much blow-by of the combustion gases in the crankcase reducing the power and torque of the motor.
What happens with too much ring gap?
Maximum ring gap is an important part of ring performance in that too much gap results in lost compression, power loss, and ultimately poor oil control.
How do you check Pistons to bore clearance?
The reading on the bore gauge will be the piston to bore clearance. Rock the gauge back and forth and take the smallest reading. The smallest reading occurs when the gauge is perpendicular to the cylinder wall. Add the reading to 4.040 to determine the bore size.
What kind of engine is a 13 hp Honda GX390?
Honda GX390 13hp Engine Parts Diagrams. Honda’s GX390 13 HP engine is the largest single cylinder OHV engine that Honda builds. It boasts a small foot print for easy mounting and can power applications that pose difficulty in mounting a twin cylinder engine. The GX 390 is quiet, smooth and vibration free.
What kind of parts can you put in a Honda GX390?
Portable hydraulic power units, stump grinders, generators, trash pumps, pressure washers and small specialized farm equipment tasks are easily handled by the Honda GX390. HondaLawnParts.com stocks Genuine Honda Engine Parts to keep your GX390 in peak condition.
What is the torque peak of the Ford 390?
It boasts a small foot print for easy mounting and can power applications that pose difficulty in mounting a twin cylinder engine. The GX 390 is quiet, smooth and vibration free. It’s torque peak is almost 20 lbs ft!