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1978ish Mercury 70HP Cold start problems

Discussion Forum at MarineEngine.com » Mercury Mariner Outboard » Archive through July 29, 2009 » 1978ish Mercury 70HP Cold start problems « Previous Next »

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Jimmy Norton
New member
Username: jn6570

Post Number: 1
Registered: 07-2009
Posted on Sunday, July 19, 2009 - 11:49 pm:   Edit Post Delete Post View Post/Check IP

This motor is very hard to start when cold. After it warms up it starts and runs great. Cleaned carbs, New fuel pump kit, Good Fire. Just real pain when it is cold. Push in on key and it tries to hit and after several tries, it finally goes. Any suggestions ?
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IBNFISHN
Advanced Member
Username: ibnfshn

Post Number: 644
Registered: 11-2005
Posted on Monday, July 20, 2009 - 11:20 am:   Edit Post Delete Post View Post/Check IP

Try turning the key on, push it in and hold it while counting to 10, then start the motor.
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Jimmy Norton
New member
Username: jn6570

Post Number: 2
Registered: 07-2009
Posted on Monday, July 20, 2009 - 10:47 pm:   Edit Post Delete Post View Post/Check IP

Let's try again.... No help from that
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Derek Schulze
Member
Username: biffidum

Post Number: 34
Registered: 06-2009
Posted on Friday, July 24, 2009 - 10:21 pm:   Edit Post Delete Post View Post/Check IP

squeeze the bulb a few times before you head out.
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Brian Kinsman
Member
Username: warren_jensen

Post Number: 7
Registered: 07-2009
Posted on Friday, July 24, 2009 - 11:02 pm:   Edit Post Delete Post View Post/Check IP

check compression cold and hot see if there a big difference. also check to see if your reeds are sticking could be sticking untill enough gas and oil gets in then break then free untill sits and dries again (cold start) may have slight deposit around cage causing reeds to stick. One more check how old are the spark plugs, sometimes they look great but are electronicly worn causing high resistence and weak spark and cold normaly makes it worse.
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Fastjeff
Senior Member
Username: fastjeff

Post Number: 6350
Registered: 09-2003


Posted on Saturday, July 25, 2009 - 06:01 am:   Edit Post Delete Post View Post/Check IP

It sounds to me like the choke isn't closing tight enough.

Try this: Take some duct tape and temporarily close off the top hole in the choke plate on each carb. See if that improves starting. I've used this trick on my Merc 500 and it helped.

Jeff

PS: Mine does the same thing, by the way.

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