Ski acting WIERD in dry-dock when flushing
Macio
a flush hose, it increases throttle ALL BY ITSELF. The kill button won't
stop it. The only way to kill it is turn off the gas supply. Any ideas on
why this is happening? I'm afraid I'm going to blow it up or throw a rod.
Larry
news:z72dnTRWBL9YQy3X...@giganews.com:
There are carbon deposits on top of the piston that are nearly hot enough
to make the mixture coming in fire. When the piston adds pressure by
compressing the air when the ports close, the pressure causes this near-
explosive mixture to fire somewhere near the top of the piston's travel.
The engine has become a gasoline-fired 2-stroke diesel engine that is out
of control as you cannot stop the fuel spray from the carb. Take away
the fuel, it stops.
The carbon deposits are caused by the mixture being wrong. Put in a new
set of plugs, properly gapped, and take the ski out for a nice long run
at wide open throttle, ending back up at the ramp. Do not idle the ski
at the end of this run as that will give the plugs the wrong indication.
Stop the ski and paddle it in, rather than running it in fast and
crashing it on the rocks. (This is best done with a test tank, but I
assume you don't have one.) Immediate shutdown at wide open throttle is
the key. There is NO STEERING if you're still moving when you shut it
down...careful, careful.
Now, pull out the plugs, one at a time, and look at their condition after
this wide open run. They should be DRY and a light brown color like
light chocolate. Black and wet = too rich. Really light to white = too
lean and it may seize up as the heat melts the rings into the
walls....always right at the fastest ride you ever had in a 2-stroke
boat! 2-cycle engines run best just before they seize.
A little too rich is MUCH better than too lean. A little too rich means
the engine will last longer as it has more lubrication.
The head should be removed, the carbon deposits cleaned off the pistons
and head, the head replaced and PROPERLY TORQUED DOWN ON A NEW HEAD
GASKET, so she doesn't blow up, if you don't mind. The service manual
has the torque specs.
If you're not sure, then you need a good jetski mechanic and let him know
you'd like the ski to run longer than 4 hours before it seizes because
it's not a racing boat but a pleasure cruiser.
I successfully returned my 1997 Yamaha GP1200 PoS that never ran right
and the crankshaft came apart on for a full refund at the end of 1997
under the Magnusson Moss Warranty Protection Act, in spite of Yamaha
telling me they'd never take back the PoS. I didn't pay a dime. Some
here may still remember me, if there's anyone left...
Good luck with your Waverunner. The 1100 was a better engine than the
1200. The 650 2-cyl ran like a top way past when I sold mine....
Walcott
> "Macio" <ftal...@swbellREMOVETHIS.net> wrote innews:z72dnTRWBL9YQy3X...@giganews.com:
good luck