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Old 22 October 2011, 13:06   #1
Country: UK - Scotland
Length: 4m +
Join Date: Oct 2011
Posts: 1
MERCURY 50 hp 4 stroke/carbs

hi any body any ideas on this one ,you start it up ticks over ,warms up then the revs start picking up by themself, throttle cable disconnected.
there is a diaphragm thingy at the top of the engine with 4 pipes 1 to each carb,do you think if this was holed it would do this. any ideas most welcome. thanks ian

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Old 22 October 2011, 15:11   #2
Country: UK - England
Town: Looe
Make: Delta
Length: 4m +
Engine: Mercury
Join Date: Apr 2004
Posts: 1,380
Probably need to put a vacuum gauge on the inlet manifold and balance the carbs to see whats going on.

Black Dog Marine
Turbodiesel is offline   Reply With Quote
Old 24 October 2011, 08:45   #3
Country: UK - England
Town: bicester
Length: no boat
Engine: outboard only
Join Date: Feb 2009
Posts: 913
if i was doing it i would strip clean re-assemble as per factory spec then balance them with vacum gauges as Robby said (i used to clean them in a sonic bath)
uncle al is offline   Reply With Quote
Old 20 November 2011, 14:15   #4
Country: UK - Scotland
Town: Glasgow
Boat name: snagglepuss
Make: Shetland
Length: 6m +
Engine: 90 hp Outboard
Join Date: Nov 2011
Posts: 562
bring it in if you still have a problem. it costs nothing for us to look!

clydeoutboards is offline   Reply With Quote

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