hey guys...i put my motor back in and i had spark on all 4 plugs but now i dont have any on the trailing plugs. any suggestion?

 

Trailing is top set ,Leading is the lower set .If the leading trigger or coil goes bad you will loose two plugs . To loose both trailing plugs you must have two bad triggers or two bad coils or one each bad . Hard to do .Check the ingniter if it is the trailing coils .