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5 H.P. 4 Stroke Honda Outboard Problem - Recognize cause of this sound


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#1 Charlie_H

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Posted 10 June 2014 - 02:38 AM

Hi folks,

 

Another season, another round of outboard problems!

 

Wondering whether anyone can identify the cause of this sound?

 

 

I had the outboard serviced this year (as I do every year) and the mechanic said it ran beautifully in his tank. When it went back onto the boat (with my fuel system), it idled roughly and then started in with the sound recorded in the linked video.

 

I figured it's a problem with my fuel system given that the outboard reportedly ran fine in the mechanic's tank. The fuel line and fuel assembly were old and in need of update, so I replaced them. Now also using using fresh fuel, but "clicking" or "knocking" sound is still there. 

 

The problem only seems to kick in when the throttle is set to the "start" setting. When revs are any lower, no problem. 

 

Any thoughts would be appreciated. 

 

Many thanks,

Charlie

 

 



#2 Dex Sawash

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Posted 10 June 2014 - 02:58 AM

Sounds like lean misfire to me. Float bowl running dry and it coughs back through the carb. Or blocked jet. Probably a fuel problem at any rate.

#3 TheFlash

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Posted 10 June 2014 - 03:10 AM

it doesn't take much contaminant to fuck up a nice clean carb...



#4 sailSAK

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Posted 10 June 2014 - 04:11 AM

Ethanol?  I ran one of those for a few years and recall it being fairly sensitive to fuel quality.  Could also be weak spark from the sounds of it.



#5 hard aground

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Posted 10 June 2014 - 01:13 PM

I was thinking ethanol too........



#6 sailman

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Posted 10 June 2014 - 01:20 PM

Put this in your tank:

 

6410004_sef_sf16_pri_larg.jpg

 

Ethanol problems go away.



#7 TheFlash

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Posted 10 June 2014 - 03:30 PM

unless little bits of degraded fuel hose line are already in the carb...



#8 Murphness

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Posted 10 June 2014 - 04:15 PM

Put this in your tank:
 
6410004_sef_sf16_pri_larg.jpg
 
Ethanol problems go away.

Seconded. It's the shit...

Edit: spray it directly into the carb and throttle up and down while spraying, then add some to tank...

#9 Charlie_H

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Posted 11 June 2014 - 01:35 AM

Thanks for the suggestions. I picked up some Seafoam on my way home from work. Hoping for an easy fix. Cheers.



#10 BobBill

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Posted 11 June 2014 - 08:16 AM

Ethanol Fail...it is wishful thinking ruination perpetration on a very foolish Congress and nation. You burn it at your own risk.



#11 Monkey

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Posted 12 June 2014 - 01:25 AM


Ethanol Fail...it is wishful thinking ruination perpetration on a very foolish Congress and nation. You burn it at your own risk.


Working for the biggest outboard manufacturer in the world, I bet I could arrange corporate sponsorship for the pitchforks. (Due to OSHA rules, we'd prefer torches are brought from home)




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