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Old 09 July 2019, 02:28   #1
Country: UK - England
Town: Surrey
Boat name: ocean pro 6.3
Make: Humber
Length: 6m +
Engine: 140hp suzuki
Join Date: Feb 2004
Posts: 692
Johnson 4hp - stops after few seconds

Hi all,

Hoping to tap into some of your wisdom and knowledge.

Johnson 4hp has a broken throttle cable, this has now been replaced and the timing plate loosened so it moves as it should.

Now starting it up it starts after a few pulls but stops after a few seconds. I did then notice that the vent on the fuel tank was still closed (oooops!). So going to try again tonight see if after itís cooled down it starts and keeps running with the vent open. That wouldnít have helped.

But if that doesnít do the trick, Iím thinking maybe the carb needs cleaning. Has anyone done this on a Johnson 4hp or similar from the mid 1990s? Itís. 1994 two stroke 4hp engine.

Any guidance most appreciated!!!

Ps I have a video but donít think I can add it in here?

xpertski is offline   Reply With Quote
Old 10 July 2019, 12:58   #2
Country: UK - England
Town: Manchester
Boat name: futura
Make: zodiac
Length: 3m +
Engine: outboards 4, 8 &15hp
Join Date: Jul 2018
Posts: 8
Johnson 4hp carb clean

These are well known for the carb getting blocked especially if left for long periods. When cleaning pay particular attention to the idle and intermediate drill holes in the bore at the butterfly and of course the float bowl.

redken is offline   Reply With Quote
Old 12 July 2019, 10:22   #3
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Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: Tohatsu 30HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 11,099
Originally Posted by xpertski View Post
Ps I have a video but donít think I can add it in here?
You can but itís temperamental and often doesnít play well for other people even if you can get it to upload. The easiest solution is to put it on YouTube and link to it here.
Poly is offline   Reply With Quote

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