Old 40 4hp mercury won’t start

Big Bruce

Recruit
Joined
Jul 3, 2023
Messages
4
I have spark and compression put new gas new fuel line still won’t start any help would be appreciated.
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
37,961
It may jump a gap on the sparkplug laying on the block.----That does not mean it fires when air is compressed to 80 PSI in the cylinder.----Do this simple test.----Put 6 or 7 drops of fuel the sparkplug hole.----Install plug.----Try and start motor.----Report what happens..----
 
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