Echo CS-305 TROUBLESHOOTING, Table

TROUBLESHOOTING

Poor performance of the engine and/or cutting mechanism can normally be prevented by carefully following these instructions.

Poor performance can easily be corrected even by a beginner.

When the engine does not function properly check the following three (3) points first.

•Is the engine compression adequate?

•Is fuel system in good condition and is enough fuel being supplied?

•Is electrical system in good condition and is spark plug operating normally?

When there is serious trouble with the unit, do not try to repair it yourself but have your distributor or dealer do it for you. For detailed TROUBLESHOOTING refer to tables 1 and 2. Locate the problem on the following charts and repair as necessary.

Table 1

start)to difficultis (or,start notdoes Engine
	Engine cranks	There is fuel in the tank
			Fuel is reaching carburetor	Fuel is reaching cylinder

Fuel is not

reaching carburetor

Fuel is not reaching cylinder

No spark at high tension cord end.

			No spark at plug
There is spark at high tension cord end
	plug
	at			Fuel does not
	sparkisThere	procedures		keep running
		Starting correct
				Acceleration
				and low speed
				function
				defective
				Carburetor
				overflow

Engine does not crank

Fuel strainer clogged ...................................	Clean.
Fuel pipe clogged ........................................	Clean.
Suction insufficient .......................................	Make sufficient.
Strainer clogged ..........................................	Clean.
Carburetor out of order .................................	Disassemble and check.
C.D.I. module defective .................................	Remove and replace.
Ignition coil defective ....................................	Remove and replace.
Wire connection defective .............................	Reconnect.
High-tension cord connection defective .........	Repair as necessary.
Switch is grounded .......................................	Switch on.

Insulator cracked ..........................................	Replace plug.
Spark gap incorrect ......................................	Adjust.
Covered with carbon .....................................	Clean or replace.
Fouled with fuel ............................................	Clean or replace.
Starting procedures incorrect .......................	Start correctly.
Low and high speed needle ...........................	Readjust.
setting too lean
Metering lever spring too strong ..................	Readjust.
Fuel pump diaphragm defective .....................	Replace.
Fuel passage clogged with dust ...................	Disassemble and clean.
Fuel leaking from fixing surfaces ..................	Retighten all screws.
of carburetor
Air valve, fuel tank cap does not
work normally ...............................................	Replace or Clean.
Fuel pump does not operate ..........................	Check impulse drilling.
Fuel inlet needle valve clogged with dust .......	Clean.
Metering lever spring not placed
in dent of lever ..............................................	Correct.
Muffler sticky with fuel ...................................	Fuel mixture is too rich
	Start the engine several times
	with choke rod fully open and
	run at fast idle until engine
	does not smoke.
Bearing damaged .........................................	Disassemble and replace.
Piston and/or cylinder seized ........................	Disassemble and replace.
Crankshaft worn ...........................................	Disassemble and replace.
Crankshaft contacting crankcase ..................	Disassemble and replace.

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