Larry W4CSC wrote:
"Tim" wrote in
oups.com:

Any suggestions?


Tim


Engine running LEAN burns exhaust valves in the heat.....fries head
gaskets, piston tops, pre-ignition knock and overheating increase.

Is it left at the dock with full-of-gas float carbs to evaporate into
shellac, clogging all the jets and making it lean as hell? Clogged fuel
injectors do the same thing to FI engines.

Cut off the fuel and run the carbs DRY in any gas engine if you're going to
store it for over a day....keeps the shellac out of those jets!

--
Larry

So many outboards are running so lean.......
inboards, too!

Larry, I had the same problem, it turns out, with the new fuel with
ethenol in it, the engines run lean. Now if your engine is close to
lean, and you burn the new fuel, it can push you over the edge. The
engine starts to detonate, this raises the temp and pressure in the
cylinders dramatically. The end result, burned exhaust valves, blown
head gaskets and bent rods in a very short period of time. When you get
the engine rebuilt, check those rods, you should back off on the engine
timing by one to two degrees, this should stop the problem from comming
up again. Your not the only one to have this happen to them.

John