Stus-List Yanmar 2gm black smoke on start

Josh Muckley muckleyj at
Thu Aug 3 23:22:58 EDT 2017

Black on start, clears with RPM.  Does it come back?

Sometimes dirty or old injectors can leak a little fuel back on top of the
cylinders while shutdown.  It burns of during startup and blows black
smoke.  It may not make a lot of difference to the operation of the engine
but will probably get worse.

Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD

On Aug 3, 2017 9:24 PM, "Dave S via CnC-List" <cnc-list at> wrote:

> Evening all
> This just started.  Black smoke on startups clears with rpm.  Have read
> that's unburnt fuel.  Have not serviced engine other than oil and filter...
> suggestions?  Tx.
> Dave. 33-2
> Sent from my iPhone
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