Sticky Valves

[rlindgren]

When I take out any of my plugs I get good compression for the first one or two storkes then nothing.

The engine ran great when I put her away last winter but after I finnally put her in the water early July the engine always starts the same way.

After alot of cranking the engine starts, runs very rough, backfires, and dosn't seem to be running on all cylinders. Then after about 1 min. the engine just starts to purr and I have plenty of power. If we motor for a while, shutdown to sail for 1 hour, the engine fires right back up.

I think the valves are sticking then free up as I crank, I am using straight 30 oil.

Suggestions?

[Don Moyer]

I'd try a standard Marvel Mystery Oil (MMO) treatment first, (5 or 6 squirts
from an oil can in the affected cylinders and then burn off the MMO). You
might also try up to a quart of MMO in the crankcase as well, in case the
tappets are involved. Be sure to use at least 10 ounces of MMO in the fuel
tank per 10 gallons of fuel.

If MMO does not free the valves, I'd remove the valve cover and check for
broken valve springs.

Don