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29 August 2014, 09:59
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#1
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Member
Country: UK - England
Town: Margate Kent
Boat name: orange
Make: tornado 5.4
Length: 5m +
Engine: outboard yamaha 85
Join Date: Aug 2014
Posts: 39
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yamaha 85 leaky carb
any advice and help of any kind most welcome please!!
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29 August 2014, 10:53
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#2
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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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Where's it leaking from?
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29 August 2014, 13:17
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#3
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Member
Country: UK - England
Town: Margate Kent
Boat name: orange
Make: tornado 5.4
Length: 5m +
Engine: outboard yamaha 85
Join Date: Aug 2014
Posts: 39
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hi thanks for getting back, i am not too sure yet i have to investigate further, i bought the boat yesterday and towed it back from Belgium, during transit the fuel pipe was connected to the engine, and it seems to have decided to overflow from somewhere.
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29 August 2014, 16:38
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#4
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Member
Country: UK - England
Town: Leeds
Make: Valiant 450
Length: 4m +
Engine: Yamaha 55HP
Join Date: Jan 2013
Posts: 448
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Probably a bit of dirt in the float needle valve holding it open. The carb will flood and leak. Unless you have a missing o ring in the fuel filter or a hose has disconnected it would be hard to see it being anything else.
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29 August 2014, 17:46
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#5
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Member
Country: USA
Town: NorCal
Boat name: SHARKY
Make: AB
Length: 4m +
Engine: Honda BF75 & BF5
Join Date: Dec 2009
Posts: 2,098
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Connect a fuel tank and pump the fuel bulb. Watch for leaks! If not leaks tow down road shortly. Watch for leaks! (Note make sure motor is in the position it was towed in.) Needle seats failing are fairly common. If one failed I would recommend doing full carb rebuilds.
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29 August 2014, 18:14
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#6
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Member
Country: UK - England
Town: Margate Kent
Boat name: orange
Make: tornado 5.4
Length: 5m +
Engine: outboard yamaha 85
Join Date: Aug 2014
Posts: 39
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fingers crossed its a nice easy one! many thanks, i had wondered if the long car journey from Belgium and given things a good jiggling? its one of the jobs to get to the bottom of! many thanks guys
also engine was in full tilt up position during transit
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29 August 2014, 19:07
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#7
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Member
Country: UK - England
Town: Sticks, N.Yorks
Boat name: Tamanco
Make: Honwave 3.5AE
Length: 3m +
Engine: Tohatsu Outboard
Join Date: May 2012
Posts: 1,175
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I had an issue with a Mariner 115 that turned out to need new float needles! Fuel gushed out into the air filter and was really bad with the engine tilted up running or not. Easy fix & worth a look. 
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29 August 2014, 19:12
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#8
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Member
Country: UK - England
Town: Margate Kent
Boat name: orange
Make: tornado 5.4
Length: 5m +
Engine: outboard yamaha 85
Join Date: Aug 2014
Posts: 39
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nice one, i am going to be brave and have a poke at it, probably in the morning!
thanks
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29 August 2014, 20:41
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#9
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Member
Country: UK - Wales
Town: Here
Boat name: doggypaddle
Make: Avon 5.4 Searider
Length: 5m +
Engine: yamaha 80
Join Date: Jul 2007
Posts: 1,107
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My 80 will dribble fuel out of the carbs if its tilted fully up for towing.
I wonder if you left your fuel tank vent shut and the fuel hose connected?
Trimmed up the carbs may dribble out of the float chambers through the main jet because of the extreme angle, and the fuel was being replenished by the pressure in the tank caused by warmth and slopping fuel?
I always run mine out of fuel by disconnecting the hose and leave it disconnected before towing.
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29 August 2014, 22:14
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#10
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Member
Country: UK - England
Town: Margate Kent
Boat name: orange
Make: tornado 5.4
Length: 5m +
Engine: outboard yamaha 85
Join Date: Aug 2014
Posts: 39
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thanks doggypaddle, everything you wrote is spot on! thats exactly what happened with the towing, i will have to run some tests to verify but you could be right on the money!! many thanks
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