Testing Spark; Checking Spark Plug - Echo PB-251 Service Manual

PB-251

3-2 Testing spark

(A)

3-3 Checking spark plug

IGNITION SYSTEM
Do not touch the spark plug while perform-
ing the test to avoid receiving electric shock.
Do not check the spark in an area where gaso-
line is spilled or flammable gases may exist.
(C)
1. Disconnect spark plug cap from spark plug.
2. Connect spark tester 897800-79931 (A) to spark
plug and spark plug cap as shown.
3. Screw in adjuster (B) until the tips contact together
and turn back four turns to set the spark tester gap
(C) to 4 mm (0.16 in).
(B)
4. Set ignition switch to RUN position.
5. Pull starter grip several times.
6. If the spark is blue, white and steady by tester
gap, ignition system is considered good. Go to "3-3
Checking spark plug".
7. If no spark exists or spark is red, yellow or
intermittent, continue with further tests according to
"3-1 Trouble shooting guide".
1. Remove spark plug, check for fouling and worn,
and rounded center electrode.
(A)
2. Clean plug electrodes and insulator of
carbon deposits, or replace with new spark plug.
3. Check spark plug gap.
Standard: 0.6 to 0.7 mm (0.024 to 0.028 in).
4. If engine does not start after cranking several
times in spite of proper spark plug condition, check
if spark plug is wet or dry. If it is excessively dry or
wet, check fuel system.
WARNING DANGER
WARNING DANGER
15