MERCURY 50 hp 4 stroke/carbs

[ianc]

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

[Turbodiesel]

Probably need to put a vacuum gauge on the inlet manifold and balance the carbs to see whats going on.

[uncle al]

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)

[clydeoutboards]

bring it in if you still have a problem. it costs nothing for us to look!

Dave