Motor dies under load

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dcpron
Posts: 4
Joined: 11 Dec 2015, 09:43
Location: Jacksonville FL

Motor dies under load

Post by dcpron » 28 Sep 2016, 10:19

I just bought a used 90's era 5hp Mariner outboard. The motor starts easily ( first or second pull ) and runs very good in neutral. Problem is when I put it in forward it stalls and dies after throttle is advanced no more than a 1/4 inch. Any Suggestions or do I have a major problem ???
Thanks
Lowe 1032

Xtremeboats
lovedr79
Posts: 2550
Joined: 07 Mar 2011, 19:58
Location: Harrisonburg, Va.

Motor dies under load

Post by lovedr79 » 28 Sep 2016, 11:13

have you tired cleaning the carb? i would start with a carb rebuild/cleaning.
Grizzly 1448SC
Lowe 10' jon

dcpron
Posts: 4
Joined: 11 Dec 2015, 09:43
Location: Jacksonville FL

Motor dies under load

Post by dcpron » 28 Sep 2016, 11:48

lovedr79 wrote:have you tired cleaning the carb? i would start with a carb rebuild/cleaning.
Thanks for the reply
Haven't yet, but I will.
Seller "said" that he had just done a carb cleaning. I thought that it ran so strong on start up and would rev up powerfully in neutral the carb was good ??
Lowe 1032

Shaugh
Posts: 570
Joined: 20 Jul 2015, 11:19

Motor dies under load

Post by Shaugh » 28 Sep 2016, 12:18

If the engine revs in neutral but dies in gear it's likely you have a problem in the lower unit. Does it run in gear with the motor at idle speed ?

dcpron
Posts: 4
Joined: 11 Dec 2015, 09:43
Location: Jacksonville FL

Motor dies under load

Post by dcpron » 28 Sep 2016, 12:46

Shaugh wrote:If the engine revs in neutral but dies in gear it's likely you have a problem in the lower unit. Does it run in gear with the motor at idle speed ?
Yes, but as soon as any throttle is increased the engine dies
Lowe 1032

Shaugh
Posts: 570
Joined: 20 Jul 2015, 11:19

Motor dies under load

Post by Shaugh » 28 Sep 2016, 14:23

Ok so if it idles in gear and there's no scary noises it's likely just your high speed needle on the carb.

For a quick test I'd back that needle all the way out, then squirt gumout in there to flush out any blockages. Put it back in to the recommended start point and see what happens.

dcpron
Posts: 4
Joined: 11 Dec 2015, 09:43
Location: Jacksonville FL

Motor dies under load

Post by dcpron » 28 Sep 2016, 15:23

Shaugh wrote:Ok so if it idles in gear and there's no scary noises it's likely just your high speed needle on the carb.

For a quick test I'd back that needle all the way out, then squirt gumout in there to flush out any blockages. Put it back in to the recommended start point and see what happens.
Thanks,
I've got my fingers crossed and I'll give it a try.
Let you know how it works out in a couple days.
Ron
Lowe 1032

Shaugh
Posts: 570
Joined: 20 Jul 2015, 11:19

Motor dies under load

Post by Shaugh » 28 Sep 2016, 15:32

Some newer carbs don't have a high speed needle. In that case pull the fuel line where it enters the carb and squirt lots of gumout up there. See what comes out...Then test again. This is only a quick test to see if it changes your situation. If it does then you know you need a good carb cleaning.

CedarRiverScooter
Posts: 845
Joined: 13 Nov 2014, 08:01

Motor dies under load

Post by CedarRiverScooter » 28 Sep 2016, 22:51

Could also be a clogged filter screen. There may be one going into the fuel pump or at carb inlet.

Regardless, I would get a carb rebuilt kit & clean it well. Consider a new float too, the foam one's deteriorate with age.

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