I put my M43 in the woods last weekend for some trail riding (more like a boat ride with all the rain we have been having) here in Florida. After going through several creek crossings I began to have what I thought was a miss due to electrical getting wet. By the time I drove home for the day the intermittent miss had become constant and I had lost a lot of power. Trouble shooting yesterday began with a garden hose to the motor while running to find the electrical problem. I found that standing water around the spark plugs (new and amphibious) had air bubbles leaking into several of the cylinders . I ran a compression check and had from front to back 0;90;90;95;95;95 psi. Oil added to NO.1 still read 0 psi. Since the cylinder next to this one read 90 psi, I assume I have a burnt valve. .
Does anyone read the results differently? How difficult is it to change the valves on the 230? Could the water getting into the cylinder have burned the valve? And why the heck are the threads leaking with new plugs and new compression rings on the plugs? Thanks in advance for any ideas.
I haven't had enough coffee yet, so forgive me if I'm way off the mark.
As for the bubbles, was your engine hot when you ran this test? If so, you were most likely just boiling off the water.
As for the pressure readings, was the engine hot or cold when you took the readings? Were the 90 & 95's dry or oiled? I think something like 130-135 optimal - in the 90's it will run (my truck is proof of that), but not that well. (Aren't these 230's amazing??)
You can trust your mother, but you can't trust your ground.
Home 
. I ran a compression check and had from front to back 0;90;90;95;95;95 psi. Oil added to NO.1 still read 0 psi. Since the cylinder next to this one read 90 psi, I assume I have a burnt valve. 
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