This repair manual covers 1974-1977 Honda 250cc and Honda 360cc Twins (two-cylinder) street motorcycles, including the following models:
Book Excerpt: 1974-1977 Honda CB250, CJ250, CB360, CL360, CJ360 Repair Manual
- Honda CB250GS, all years
- Honda CJ250T, all years
- Honda CB360, 1974
- Honda CB360G, 1974
- Honda CL360, 1974-1975
- Honda CJ360T, 1976-1977
Although it is the second most likely cause of trouble, fuel delivery should be checked first simply because it is the easiest.
First, check the tank to make sure there is fuel in it. Then, disconnect the fuel hose at the carburetor, open the valve and check for flow (Figure 2).
If fuel does not flow freely make sure the tank vent is clear.
Next, check for blockage in the line or valve. Remove the valve and clean it as described in the fuel system chapter.
If fuel flows from the hose, reconnect it and remove the float bowl from the carburetor, open the valve and check for flow through the float needle valve.
If it does not flow freely when the float is extended and then shut off when the flow is gently raised, clean the carburetor as described in the fuel system chapter.
When fuel delivery is satisfactory, go on to the ignition system.
Compression - or the lack of it - is the least likely cause of starting trouble. However, if compression is unsatisfactory, more than a simple adjustment is required to correct it (see the engine chapter).
An accurate compression check reveals a lot about the condition of the engine. To perform this test you need a compression gauge (see Chapter One).
The engine should be at operating temperature for a fully accuratge test, but even a cold test will reveal if the starting problem is compression.
Remove the spark plug and screw in a compression gauge (Figure 5). With assistance, hold the throttle wide open and crank the engine several times, until the gauge ceases to rise.
Normal compression should be 130-160 psi, but a reading as low as 100 psi is usually sufficient for the engine to start. If the reading is much lower than normal, remove the gauge and pour about a tablespoon of oil into the cylinder.
Subject: 1974, 1975, 1976, 1977 Honda CB250, CJ250, CB360, CL360, CJ360 service, maintenance, repair. ISBN-10: 0892872101 | ISBN-13: 9780892872107 | Clymer M323