Del Cecchi wrote:
"gileswile" wrote in message
oups.com...
Hi
I have a mid 80s vintage Mercury 115 oil injected. When i acquired it
only 3 of the 6 ports were receiving a spaek. I rectified this with a
new switcher unit. But since then it has always had a problem if you
boot it so to speak. It refuses to rev under load(fine in neutral)
unless you very slowly go up the rev range - by slow I mean taking
several minutes from 1000 to 6000 revs. The carbs all seem ok. Is the
direct injection mix at fault - too much oil? Can I overcome the
problem with hotter plugs? Or is it a fuel supply fault. Any
suggestions greatly appreciated. cheers.

I don't know what happens when you boot it, but have you checked the
spark advance?

del cecchi

OK
Thanks for that Del. It didn't realise that 2 strokes had an
advance/retard mechanism. As there is no dizzy as such, what operates
the advance (which I could find a manual for this motor somewhere).
cheers