Honda outboard advice

[Anthonyexmouth]

Just picked up a cheap BF5 A and although it starts and runs ok it won't idle very well, guessing it's a dirty carb but I've also noticed a water leak coming from underneath the condenser, dribbles down when running. Is this likely to be a head gasket or is there something else there that could be leaking?
one other thing is the manual start cog is just clipping/tinging the flywheel. Is this an easy fix?

Video in the link

New video by Anthony

 

[Anthonyexmouth]

Is this a worn plastic cog or is something else at fault to make this so sloppy?
New video by Anthony

 

[Steve65]

Does it run better with the cowl removed?

 

[Anthonyexmouth]

Not tried that, I did clean the carb and seems to be running better now. Not a fan of outboards, only got this through necessity. It is kinda slow picking up revs from tick-over though. Here is it running flat out.
New video by Anthony