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19-10-2016, 09:45
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#1
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Registered User
Join Date: Dec 2011
Boat: Blue Buoy Del Rey 50
Posts: 206
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Honda 20hp 4stroke issue
I am having a problem with a honda 20hp 4 stroke. I start it with choke it runs a few secs and dies. Then I start it without chock it will idle just above the point of dying an can run anywhere from about 1sec to around 60secs before dying if I try to turn throttle at all it dies.
Any suggestions on what it maybe or I can try.
I have already replaced the fuel. Opened the screw on the carb to let out anything and pumped new fuel in.
I tried some carb cleaner.
Spark plugs look ok but didnt replace them.
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19-10-2016, 10:05
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#2
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Moderator Emeritus
Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
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Re: Honda 20hp 4stroke issue
Most likely dirty carb, usually is.
But just for kicks, try keeping the bulb pump tight, see if that makes a difference, once in a blue moon a fuel pump goes bad and the check is to keep the bulb pumped tight.
I'd bet money this is not it, but its easy to check and cost no money, so why not check?
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19-10-2016, 10:15
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#3
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Registered User
Join Date: Jul 2016
Posts: 797
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Re: Honda 20hp 4stroke issue
Clean carburator, check fuel filter.
__________________
We are sailors, constantly moving forward while looking back. We travel alone, together and as one - to satisfy our curiosity, and ward off our fear of what should happen if we don't.
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19-10-2016, 17:00
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#4
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Registered User
Join Date: Dec 2011
Boat: Blue Buoy Del Rey 50
Posts: 206
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Re: Honda 20hp 4stroke issue
Quote:
Originally Posted by a64pilot
Most likely dirty carb, usually is.
But just for kicks, try keeping the bulb pump tight, see if that makes a difference, once in a blue moon a fuel pump goes bad and the check is to keep the bulb pumped tight.
I'd bet money this is not it, but its easy to check and cost no money, so why not check?
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Tried the bulb pump tight that wasnt it.
Ok will have to remove carb then such a pita on this motor. I tried pumping some carb cleaner in as well but that didnt help.
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19-10-2016, 17:33
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#5
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Registered User
Join Date: Aug 2015
Location: SW Florida
Boat: Grand Banks 49
Posts: 572
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Re: Honda 20hp 4stroke issue
Quote:
Originally Posted by deepthought
Tried the bulb pump tight that wasnt it.
Ok will have to remove carb then such a pita on this motor. I tried pumping some carb cleaner in as well but that didnt help.
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===
I have the same engine and end up replacing the carb every 2 or 3 years. That's the best cure, and a good Honda mechanic can do it in about 30 minutes.
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19-10-2016, 17:54
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#6
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Registered User
Join Date: Nov 2015
Location: Singapore
Boat: Seawind 1160 Lite
Posts: 257
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Re: Honda 20hp 4stroke issue
I Have 2 of the same engines and straight off sounds like fuel, assume you have replaced the internal fuel filter?
One reason why I would never buy a Honda again is that they are nearly impossible to work on , everything is hard to get at to work on and you even need to remove the lower cowlings to replace the oil filter, crazy design layouts on these engines.
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19-10-2016, 18:35
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#7
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Registered User
Join Date: Jan 2005
Location: On board
Boat: Van de Stadt 50'
Posts: 1,405
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Re: Honda 20hp 4stroke issue
Have the float bowl cleaned ultrasonically, There is a passage in there that is subject to blockage. Do NOT use a wire, the size is critical. The accelerator pump can be cleaned with it.
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20-10-2016, 08:49
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#8
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Registered User
Join Date: Mar 2012
Location: Panama
Boat: Woodward 47
Posts: 54
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Re: Honda 20hp 4stroke issue
Andrew Grace. I also have a Honda and love it.
It is not difficult to remove the carby and clean it. Like wise the oil filter. All you need is a little mechanical understanding. Clean all passages in the carby, remove the tubes and jet. It's very easy.
Sent from my C6903 using Cruisers Sailing Forum mobile app
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20-10-2016, 09:34
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#10
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Registered User
Join Date: Feb 2013
Location: Live-aboard Cruiser
Boat: Lagoon 450
Posts: 628
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Re: Honda 20hp 4stroke issue
We also have the same outboard and the same reoccurring problem. First time the carb needed a rebuild and cleaning(with replacement valve seats). The second time, a few weeks ago, it started the same choke issues and now Ive replaced the carb completely. This seems to be a common problem with Honda BF20's. The replacement carb I will rebuild and keep for the next time.
__________________
Steve
SV Emerald Sea
L450
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20-10-2016, 10:52
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#11
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Registered User
Join Date: Jul 2016
Posts: 797
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Re: Honda 20hp 4stroke issue
Quote:
Originally Posted by fabricator-ken
Andrew Grace. I also have a Honda and love it.
It is not difficult to remove the carby and clean it. Like wise the oil filter. All you need is a little mechanical understanding. Clean all passages in the carby, remove the tubes and jet. It's very easy.
Sent from my C6903 using Cruisers Sailing Forum mobile app
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I don't think Andrew's opinion is due to lack of mechanical understanding. To service the outboard requires you to have good access to the outboard from below - not usually a problem on a tender or conventional rear mounted outboard, sort of hard in the engine access in a seawind catamaran.
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20-10-2016, 11:28
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#12
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Registered User
Join Date: Feb 2016
Location: USA
Posts: 489
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Re: Honda 20hp 4stroke issue
Quote:
Originally Posted by wayne.b
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I have the same engine and end up replacing the carb every 2 or 3 years. That's the best cure, and a good Honda mechanic can do it in about 30 minutes.
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That's just wonderful, if you happen to be in the money printing business.
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20-10-2016, 16:33
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#13
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Registered User
Join Date: Nov 2015
Location: Portland maine
Boat: 1986 Catalina 27
Posts: 87
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Re: Honda 20hp 4stroke issue
Quote:
Originally Posted by wayne.b
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I have the same engine and end up replacing the carb every 2 or 3 years. That's the best cure, and a good Honda mechanic can do it in about 30 minutes.
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Replace the carb? 2 to 3 YEARS? i have three outboards, 2 yamahas and a Tomos moped. My 2001 yamaha 8hp and my 1995 moped both came from the metal and misc dumpster in the Portland dump. neither of the carbs were replaced, just rebuilt by me, both run perfectly. idk what kind of mechanic you have, but carbs should last much longer than the short time you have described!
ps if they really break beyond repair every two years, theirs something to be said about honda workmanship! throw that thing in a dumpster and buy yourself a yamaha!
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20-10-2016, 17:18
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#14
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Registered User
Join Date: Oct 2015
Location: Summerstown Ontario Canada
Posts: 457
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Re: Honda 20hp 4stroke issue
Quote:
Originally Posted by deepthought
I am having a problem with a honda 20hp 4 stroke. I start it with choke it runs a few secs and dies. Then I start it without chock it will idle just above the point of dying an can run anywhere from about 1sec to around 60secs before dying if I try to turn throttle at all it dies.
Any suggestions on what it maybe or I can try.
I have already replaced the fuel. Opened the screw on the carb to let out anything and pumped new fuel in.
I tried some carb cleaner.
Spark plugs look ok but didnt replace them.
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Just did one yesterday with the same problem on a Mercury 4 stoke. The carburetor was full of jelly like substance. I could not free up the main jet. I used "Brake Kleens" with the nozzle and sprayed all the insides and out. Reinstalled it and all works very good. Brake Kleens is available at automotive supply stores.
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20-10-2016, 18:15
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#15
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Registered User
Join Date: Jan 2005
Location: On board
Boat: Van de Stadt 50'
Posts: 1,405
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Re: Honda 20hp 4stroke issue
No need to be rude to the OP.
The Honda is a finely made engine, possibly too finely made. The Yamaha (2 strokes) are built for a rougher life, and can take it. The Honda has very fine tolerances generally and in the carb particularly.
In the cruising world the fuel is not always as clean as it could be, and extra filters wont help as the pollutants are in solution.
The Honda is like a Fabrique National (FN) 7.62, a beautiful machine, but the AK 47 is better in a rough world.
If the cleaning suggested above does not work, it is because the orifices have eroded bigger than they should be, meaning a rich mixture. This does not happen overnight, the engine becomes sluggish, especially on acceleration, and consumption increases.
Time to replace all jets and emulsion tubes, but dont forget that passage in the float bowl.
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