1. The oil pressure warning light should come on when the ignition (main) switch is turned ON and extinguish a few seconds after the engine is started - this serves as a check that the warning light bulb is sound. If the oil pressure light comes on whilst the engine is running, low oil pressure is indicated - stop the engine immediately and carry out an oil level check (see Daily (pre-ride) checks).
2. An oil pressure check must be carried out if the warning light comes on when the engine is running yet the oil level is good (Step 1). It can also provide useful information about the condition of the engine's lubrication system.
3. To check the oil pressure, a suitable gauge and adapter (which screws into the crankcase) will be needed. Honda provide a gauge and adapter (part Nos. 07506-3000000 and 07510 4220100) for this purpose, or one can be obtained commercially. You will also need a container and some rags to catch and mop up any residual oil that gets lost In between removing the oil pressure switch and installing the gauge - on models fitted with a centrestand, place the bike on it, otherwise position the bike as upright as possible without it becoming unstable by placing a block under the sidestand, so that less oil gathers behind the switch to reduce spillage. Check the engine oil level after installing the gauge and replenish if necessary (see Daily (pre-ride) checks).
4. Warm the engine up to normal operating temperature then stop it.
5. Remove the oil pressure switch (see Chapter 9), and screw the adapter in its place. Connect the oil pressure gauge to the adapter.
6. Start the engine and briefly increase the engine speed to 6000 rpm whilst watching the gauge reading. The oil pressure should be similar to that given in the Specifications at the start of this Chapter.
7. If the pressure is significantly lower than the standard, either the pressure relief valve is stuck
8. If the pressure is too high, either an oil passage is clogged, the relief valve is stuck closed or the wrong grade of oil is being used.
9. Stop the engine. Refer to the oil pressure switch installation procedure In Chapter 9 and apply the sealant to the switch before removing the gauge. Unscrew the gauge and adapter from the crankcase and immediately install the oil pressure switch (see Chapter 9).
10. Check the oil level (see Daily (pre-ride) checks).