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19 August 2010, 16:22
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#1
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Member
Country: Ireland
Length: 5m +
Join Date: Nov 2006
Posts: 90
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problem with Yamaha 4 hp fourstroke
I have a problem just developed when the tank ran dry , the engine will start but when I push in the choke it cuts out. I dont know my way around an engine , does anyone have an idea what the problem might be?
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19 August 2010, 17:33
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#2
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Member
Country: UK - England
Town: Southampton
Boat name: Hissing Sid
Make: Ross Smith Cobra
Length: 6m +
Engine: 200HP Optimax
MMSI: 235038046
Join Date: Jun 2002
Posts: 3,804
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Start by stripping and cleaning the carb, may have sucked up some crap when you ran dry...
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19 August 2010, 23:08
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#3
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RIBnet admin team
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,069
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Quote:
Originally Posted by Jizm
Start by stripping and cleaning the carb, may have sucked up some crap when you ran dry...
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Yep, sounds like you've got a blocked jet.
It's worth putting a fuel filter in if it doesn't have one.
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20 August 2010, 02:50
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#4
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Member
Country: Other
Town: Stanley, Falkland Is
Boat name: Seawolf
Make: Osprey Vipermax 5.8
Length: 5m +
Engine: Etec 150
Join Date: Mar 2006
Posts: 3,726
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I had a similar problem with my old Johnson aux, see here http://www.rib.net/forum/showthread.php?t=33905 as above, poo in the fuel which is probably what your problem is as the bottom of the tank will have got stirred up.
As I found out after a bit of head-scratching there are usually several jets in the carb not necessarily all going in from the same direction, the obvious one on mine was not the blocked one.
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20 August 2010, 07:41
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#5
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Member
Country: UK - England
Town: Surrey
Length: no boat
Join Date: Feb 2009
Posts: 215
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4hp
is your VENT on top of the tank unscrewed
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20 August 2010, 09:55
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#6
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Member
Country: UK - England
Town: Marple
Make: Zodiac
Length: under 3m
Engine: Tohatsu 9.8
Join Date: Jun 2009
Posts: 652
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Engine fault
Blocked idle jet.
An easy job to repair if you are confident with stripping the carb, otherwise take it in to a dealer. When was it last serviced? Might be an idea to get it serviced at the same time, it's not much on these small engines, I was quoted £45.
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20 August 2010, 11:51
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#7
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Member
Country: Ireland
Length: 5m +
Join Date: Nov 2006
Posts: 90
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Thanks for the replies , I was having a look on youtube to see how it was done has anyone any step by step pictures or diagrams, I would like to learn to do it so if it happens again I could sort it
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20 August 2010, 19:15
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#8
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Member
Country: Ireland
Length: 5m +
Join Date: Nov 2006
Posts: 90
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Just to let you know , I had a go at taking the carb off and cleaning it out, then re assembly , started the engine and its running fine now. Im glad I didnt bring it to a mechanic now and have learned how to fix it again. I could do with replacing the impellor on my main engine and was wondering if I could handle it, do I need to change the thermostat at the same time, has anyone any diagrams?
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20 August 2010, 19:22
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#9
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Member
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,872
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Isn't a Yam 4 a re-badged Jetmarine? 
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21 August 2010, 01:27
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#10
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Member
Country: Other
Town: Stanley, Falkland Is
Boat name: Seawolf
Make: Osprey Vipermax 5.8
Length: 5m +
Engine: Etec 150
Join Date: Mar 2006
Posts: 3,726
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Quote:
Originally Posted by davis
Just to let you know , I had a go at taking the carb off and cleaning it out, then re assembly , started the engine and its running fine now. Im glad I didnt bring it to a mechanic now and have learned how to fix it again.
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It's one of those things that sounds quite daunting until you try it and you then find that with a few tools, some compressed air and a bit of common sense it is actually quite easy to do and you feel dead chuffed when you sort it out 
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