140 I/O Mercruiser no spark

maxster94

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Joined
Jul 14, 2019
Messages
1
1986 mercruiser 140 I/O motor no spark Been sitting for long time. Went to check some thinks to see if it would start. Rolls over fine, had 12.x volts positive side of coil, checked again later now I have 7.50v postive side of coil> Battery is good. Put new points in. Think I gapped correctly. Still no spark. What should I check next??
 
Last edited:

alldodge

Moderator
Staff member
Joined
Mar 8, 2009
Messages
40,583
If the points where closed when taking the reading, this would cause a lower voltage reading. Remove distributor cap and crank motor to see if the points are opening and closing

Point gap 0.022
Dwell 28-34 degrees
Timing 6 BTDC
Firing order 1-3-4-2
 
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