1971 Merc 650 wont start

Joined
Jun 27, 2008
Messages
8
I rebuilt the carbs and fuel pump, thinking it was a fuel problem to find out it is an ignition problem. Tested for spark and had spark at first but now dont have spark either way with or without spark motor wouldn't start. Why did I have spark then loose it ???? Is they're anyway to bypass the ignition switch box straight from the coil to the battery to see if the switch box is bad. I have a manual but as most it is for 3.5 to 110 merc hp and isn't specific for my model only because I would also like to test my coil to make sure it isn't bad. Leaving for canada in 4 weeks please help !!!!!!!!!
 
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