1986-1989 Honda TRX250 FourTrax 250R Service Manual, Page 202Get this manual
ELECTRICAL SYSTEM
TROUBLESHOOTI NG
IGNITION SYSTEM
Weak or no spark at plug 1Try spark test with kn own good spark plugWEAK OR NO SPARK GOOD SPARK, Faulty spark plug
+2Check spark plug wire for loose or poor contact at the spark plug capThen try spa rk test r GOOD SPARK-, again WEAK OR NO SPARK
Loose or poor contact of spark plug cap
Chp.ck thpr:DI (mit ('onn"'c tor" for 100'" nr
ABNORMAL-
Loose or poor contact of COl unit connectors
Door contactNORMAL 4Check the resistance and continuity at the COl unit connectors on the wire harness side (page 15-3)Also check the ignition secondary coil resistance (page 15-4)