1978 Mercury 115 will not start

T

topher 54

Recruit
Joined
Mar 25, 2011
Messages
1
Hi guys I have good spark, clean carbs, compression is good new gas but i can not get this motor to start. I have bought a new switchbox, carb kits, manual,new fuel pump kit. Cleaned all my contact points . I have not taken the flywheel off .I have no idea please help me !
 
jerryjerry05

jerryjerry05

Supreme Mariner
Joined
May 7, 2008
Messages
18,196
Re: 1978 Mercury 115 will not start

Compression/spark OK?Then starting fluid.Use it sparingly.
That don't work.Try the flywheel key.J
 
Gomer50

Gomer50

Chief Petty Officer
Joined
Sep 5, 2009
Messages
507
Re: 1978 Mercury 115 will not start

Is your model still with a distributor or with the trigger under the flywheel?I would stay away with starter fluid and use a spray bottle with gas mix and spray into the spark plug holes.Alot more friendly on the motor.Test if spark jumps according to spec. and see if she sparks at the correct time.If that spark is not nice and blue/strong she wont run.Battery full charge,if when cranking the switchbox needs at least 9 + volts or more to start.
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
28,799
Re: 1978 Mercury 115 will not start

That motor should have the battery CDI/ distributor ign. There is no flywheel key, but outer flywheel can get installed incorrectly. Put a timing light on the top spark plug wire. Idle timing with the carbs just about to open should be 4-6* BTDC. A service manual would help a lot
 
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