Merc cold start and Idle problem

ccustomrides

Seaman
Joined
Mar 3, 2010
Messages
70
Well, I have a good topic here I think.
There is a no good way really to start a cold boat or boat period.

So My Merc runs like a top. Tap on wood. I service the hell out of it and everything is good. My 4bb Carb is original and last time it was rebuilt was like 4 years ago. I found a tag on it.
When my boat is hot or been running it starts like a champ half a click.
If I let it sit for 2 days it takes about 4 cranks with throttle half way up.

Now last year I am at South River Rd. It was like 47 or even colder in the morning. I dump the boat. Pumped the throttle 3 times and put it half way up. I crancked and crancked and nothing. You get that feeling like everyone is watching you at that point. Well my choke was closed and was working fine. I ended up starting the boat at full throttle after about 30 min of crancking.
After that i never had problems but yet I put the boat away for the winter. Summer time it start on 2nd try most of the time.
Also if I engine is hot and I am fishing with engine ON sometimes it wont idle when lake is rough?

So what procedure you guys take during a cold start or any start on your Carbed Merc.NOT HOT

I will also be installing a fuel water separator on my boat this spring. and all new fuel filters.
NOTE: My carb has the spring type choke. When hot it releases and opens up. Should I buy updated style Carb with electric choke?
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,112
Re: Merc cold start and Idle problem

Ayuh,... Other than it's a Merc,.... What are We workin' on,..?? Which 4bbl. Carb,..??
 

Fishermark

Vice Admiral
Joined
Oct 19, 2003
Messages
5,617
Re: Merc cold start and Idle problem

Pumped the throttle 3 times and put it half way up......


So what procedure you guys take during a cold start or any start on your Carbed Merc.


Sounds like you have it covered.

Why it didn't start that day? Hard to tell. If it is an isolated issue, then it may never be a problem again. Could've flooded it.

How long has it been since a tune up?

Bottom line - each engine with a carb has its own "personality." You just need to get to know what it likes when it is cold. And then do it. Try only two pump instead of three next time and see what happens.
 
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