drawn into tight assembly with the engine shroud for further details of the construction of the module 22 itself reference is now made to fig4 to 9 as shown in these figures the module includes a generally cup shaped housing 50 made of an electrical insulating material preferably a molded plastic this housing defines a two lobed or figure eight shaped recess 52 having a larger lobe 54 and a smaller lobe 56 the smaller lobe 56 receives a well member 58 separate from the housing 50 of generally cylindrical shape the interior of which defines a recess or socket 60 for receiving the outer end of the associated spark plug 28 as best seen in fig7 and 9 the housing includes three angularly spaced ribs 61 61 arranged perpendicular to the plane of the recess opening which engage the outer surface of the well member to hold it in a fixed position relative to the housing the larger recess lobe 54 receives an ignition coil 62 the coil 62 is of generally conventional construction and includes a core 64 of magnetic material on which is received a primary winding 66 and a secondary winding 68 the core 64 of the coil is oriented parallel with.