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Old 22 October 2011, 14:06   #1
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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, 16:11   #2
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Probably need to put a vacuum gauge on the inlet manifold and balance the carbs to see whats going on.
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Old 24 October 2011, 09:45   #3
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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)
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Old 20 November 2011, 14:15   #4
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bring it in if you still have a problem. it costs nothing for us to look!

Dave
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