i got an old ca84-85mod dt 140hp.last year after a electric prob the engine misfired over3500rpm...checked every compnent but no prob found...BUT there is a wire not on chematicks..the ground wire from trigger coils under flywheel to cdi unit... wire was ok but def in cdi unit caused current to go thru base under flywheel(timingplate)thru ground to cdi. this gave bad contact...grounded ground wire from trigger coils and the engine has no more misfires...5800 wot clean.. 