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Old 19 August 2010, 15:22   #1
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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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Old 19 August 2010, 16:33   #2
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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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Old 19 August 2010, 22:08   #3
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Start by stripping and cleaning the carb, may have sucked up some crap when you ran dry...
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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Old 20 August 2010, 01:50   #4
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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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Old 20 August 2010, 06:41   #5
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4hp

is your VENT on top of the tank unscrewed
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Old 20 August 2010, 08:55   #6
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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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Old 20 August 2010, 10:51   #7
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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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Old 20 August 2010, 18:15   #8
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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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Old 20 August 2010, 18:22   #9
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Isn't a Yam 4 a re-badged Jetmarine?
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Old 21 August 2010, 00:27   #10
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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.
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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