Simon H wrote:
> "nuttytart in cyberspace" <[email protected]> wrote in message
> news:[email protected]...
> > hiya,
> >
> > my sj410 is becoming increasingly smokey after being stood overnight.
> >
> > it soon clears but is a bit of a smokescreen for a couple of minutes.
> >
> > any ideas,
> > love & hugs,
> > angie xxx
> >
> Valve stem oil seals? Inexpensive parts bill, PITA to fit.
> I made a gizmo to do this job without removing the head but it's still a
> PITA. The gizmo is a air line fitting 'glued' into a hollowed out sparkplug
> (the threaded bit). Screw it into the sparkplug hole, get the piston at the
> top on the compression stroke and connect to the air line. Air pressure
> keeps the valve seated while you figure out how to compress the valve
> springs...
> Also, ISTR that the SJ410 rocker shaft won't come out of the head without
> filing a bit of the casing away... Saves buying a head gasket, though ;-)
>
> Simon H
Simon's right, smoke on startup is usually the valve seals. The 410
engine is a B+**$% for smoking . . . Whilst you are at it give the
piston rings a thorough Redex treatment (more smoke only white this
time!) to make sure they are not gumming up. Blow by is a common cause
of people giving up on their 410 when all it needs is a good cleaning
out and de-gumming!
Run engine 'til hot. Take out one plug and turn engine until piston is
just a little down past top dead centre (TDC), squirt in a three or
four teaspoonful dose of Redex, screw plug back in and leave to soak
for a few hours or overnight. When soaked, take out plug, put a rag
loosely over the plug hole and crank the engine to expel any liquid.
Replace plug and fire up . . . lots of white smoke! Do each cylinder
in turn.
This will often resurrect a poorly engine and get rid of oil blowback
from crankcase pressure. It's worth reaming out the pipes from the
rocker cover to the airbox too.
Hope that helps! Lurch
))