120 omc runs & quits

boatinbubba

Recruit
Joined
Mar 21, 2009
Messages
1
Hey guys i'm a little new to the boating world but do have a fair amount of mechanical ability & could really use some help here. I recently bought a 20ft center console sportcraft with a 120 omc outboard & am having some charging/running issues. She will crank up & run fine with a hose hooked up but immediately pegs the volt meter, when i put her in the water she runs great for about ten minutes & then dies, seemingly because of a lack of spark. The battery still has plenty of juice & after taking a peak at the voltage meter it looks rather new. any ideas?
 

reeldutch

Lieutenant
Joined
Feb 2, 2004
Messages
1,340
Re: 120 omc runs & quits

when the motor dies check for spark with a spark tester.
spark should jump 7/16 gap
crispy blue spark.
 

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: 120 omc runs & quits

also see if it is running hot. can you hold you hand on top of the block for 3-4 seconds? i not it is hot.

we also need your model # so we know exactly what you have.
 

kenmyfam

Supreme Mariner
Joined
Aug 10, 2006
Messages
14,385
Re: 120 omc runs & quits

Welcome to iboats. Photos and model number will always give you faster and better advice.
 
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