TM 5-4240-501-14P IGNITION General Repair Instructions IV (Form 4750) Section 2 IGNITION Three basic types of ignition systems are used 1.   MAGNETRONTM      ignition,   a      self-contained transistor module (no moving parts) and ignition armature. 2.   A   flywheel   type,   having   either   an   internal   or external breaker system.  Fig. 4 and Fig. 25. 3.   The  Magna-Matic  system,  having  the  armature and  rotor  behind  the  flywheel,  and  an  external breaker system.  Fig. 44. Check Ignition Remove  the  spark  plug.    Spin  the  flywheel  rapidly  with one end of the ignition cable clipped to the 19051 tester and  with  the  other  end  of  the  tester  grounded  on  the cylinder head.  If spark jumps the .166" (4.2 mm) tester gap,  you  may  assume  the  ignition  system  is  functioning satisfactorily. Fig. 1. NOTE:: Flywheel must rotate at 350 RPM, minimum with MAGNETRON’" ignition. Fig. 1 - Checking Spark NOTE:   If   engine   runs   but   misses   during   operation,   a quick  check  to  determine  if  ignition  is  or  is  not  at  fault can be  made  by  inserting  the  19051  tester  between  the ignition  cable  and  the  spark  plug.    A  spark  miss  will  be readily apparent. While   conducting   this   test   on   Magna-Matic   equipped engines.  Models 9, 14, 19 and 23, set the tester gap at .060" (1.5 mm). SPARK PLUG The  plugs  recommended  for  Briggs  &  Stratton  engines are as follows: 1-1/2" 2" Manufacturer’s Plug Plug Part Number CJ-8 J-8 Champion RCJ-8 RJ-8 Champion Resistor 235 295 Autolite 245 306 Autolite Resistor WS9E - Robert Bosch 3/4" 13/16" Plug wrench (deep socket) NOVEMBER.  1983 Clean  spark  plug  with  a  pen  knife  or  wire  brush  and solvent and set gap at .030" (0.75 mm) for all models.  If electrodes are burned away, or the porcelain is cracked, replace   with   a   new   plug.      DO   NOT   USE   ABRASIVE CLEANING MACHINES. Fig. 2. Fig. 2 - Adjusting Spark Plug Gap Coil and Condenser Testing .  All Models Use  an  approved  tester  to  test  coils  and  condensers. Specifications are supplied by the tester manufacturer or refer   to   MS-7862,   Testing   Briggs   &   Stratton   Ignition Coils. NOVEMBER, 1983 2 1