In this little tutorial, I explain the method I used to perform the engine oil change on a 1994 Honda model HRF464SE self-propelled mower, equipped with the Honda GXV120 engine engine..
For information, this is an air-cooled 120cm3 OHV single-cylinder single-cylinder petrol engine ( overhead valve engine ), developing a power of 2.9 kW or 4 hp. The starting is done using a hand starter, the ignition is electronic. The oil capacity is 0.60 liters. It works with SP95 gasoline, and has no blade brake or other safety. The only controls available are throttle control and traction control. The cutting height is adjusted using 2 levers, allowing separate adjustment of each pair of wheels, in 5 possible notches.
It is an excellent machine, robust and reliable, bought 4650Frs ( a little over 700 € ... ) in June 1994 at a Honda dealer.
The problem on this machine is the accessibility of the oil drain plug, because it is arranged in such a way that on the one hand, it is impossible to unscrew it completely, and on the other hand the oil will spill over the frame during the flow. For this second point, there is little choice, apart from the total extraction engine ... Without going that far, I still loose about 2 centimeters 3 bolts ( socket Ø13) retaining the engine to the frame, so as to be able to lift it slightly, this then allowing the release of the drain plug ( Ø10 socket to be preferred to a wrench ) located at the foot of the gauge. The oil will thus flow along a channel apparently provided for this purpose ...To collect the used oil, simply place a container of about 35cm in diameter below the machine, and voila! For my part, I did not encounter any problem at this level, I actually used the pit of my garagein which I planned a sliding wooden tray, receiving my basins and other utensils for the emptying!
To gain access to these 3 fixing bolts, it is necessary to remove the cutting blade ( Ø14 socket ), as well as the blade holder, to which the transmission belt is also connected. It will be preferable to remove the cover plate from the belt ( accessible from above and located between the engine and the rear of the frame ), fixed using 2 cruciform screws. This will greatly help in handling the belt, and checking it ...
You can release the blade holder downwards by using a small hammer, and by tapping lightly in the transverse direction of the axis. This operation releases it, which is often affected by corrosion in this area ... Once removed, be sure to clean the splines of the shaft as well as those of the blade holder.
In the event of low ambient temperature, run the engine for a few minutes to warm up and thin the oil, the draining will be faster. During the flow, take the opportunity to disassemble the launcher, in order to better check the condition of the cord, but also of the locking lever( plastic ) and its return spring. Also disassemble the spark plug (original type NGK BPR5ES), and after cleaning, check the correct spacing of its electrode, which must be between 0.6-0.7mm( manufacturer's indication ).
Once the oil change is complete, fill it with Special 4 Stroke Motoculture oil..
Problem on the chassis :
It may happen that the handlebar mounting platescrack at the bolts. This has happened to me before, and in this case it is necessary to replace the defective parts.
Preparation for storage *:
- If the engine has been running, wait for it to cool for at least half an hour before cleaning it. Clean all exterior surfaces, touch up paint as necessary, and cover areas that may be oxidized with a thin layer of oil.
- When stored, fuel oxidizes and deteriorates. Old fuel can cause difficult starting and gum deposits that can clog the fuel system.
To avoid problems due to fuel deterioration, drain the fuel tank and carburetor.
- Position the assembly so that the motor is level. Tilting the engine can cause oil or fuel to leak.
Draining the fuel tank and carburetor *:
- Disconnect the fuel line to the engine and drain the tank into a container approved for fuel. If the tank is equipped with a valve, turn the fuel valve to the OPEN or ON position to allow draining.
When the drain is complete, reconnect the fuel line and turn the valve to the OFF position .
- Loosen the carburetor drain screw and drain the carburetor into a container approved for fuel. When the drain is complete, tighten the carburetor drain screw.
To help you in finding spare parts, here are some useful files to download in PDF format:
- GXV120 HONDA Engine Owner's Manual
- HONDA GXV120 Engine Maintenance Chart
- GXV120 HONDA Engine Manufacturer Specifications
- GXV120 HONDA engine diagram
To order spare parts, here is the address of a website from which I have already purchased: http://www.jardimat-motoculture.com