Here is what happened in chronological sequence.
I had the motor on a test stand with the waterline about half an inch above the cavitation plate.
I tried to start the motor with the choke on, the motor started, spun up to a high speed and then cut out. After repeating this several more times while also priming and fiddling with the low speed adjustment, the motor started and ran.
It was a bit smoky and smoke or steam started coming out of the water discharge, after a while this turned into water spraying out.
I stopped the motor and then did some spark tests for a few minutes, got strong sparks from both cylinders, the motor was more difficult to start with one cylinder only. I stopped the motor again and left it alone for a few minutes.
I went to start the motor again, I could feel the powerhead was still warm so I didn't use the choke. The motor started and ran but no smoke/steam came out of the water discharge. After 30 to 45 seconds a puff of smoke came out of the water discharge, the motor 'sneezed' and then cut out.
I started it again, this time alot of smoke/steam came out of the water discharge but it wouldn't turn into a stream of water. I began to worry after about 30-45 seconds of this, then the motor 'sneezed' again and cut out.
I started to worry that maybe the sneeze was the pistons binding inside or something being caused by overheating, so I took some water and sprinkled it over the cylinder heads and the water sizzled away. I did this a couple more times to several areas of the head which were also hot and then called it quits; I put the cover back on and left it to cool until tomorrow.
Did I overheat the motor? I had this motor on the water just the other day and it was barely warm to the touch under WOT.
I had the motor on a test stand with the waterline about half an inch above the cavitation plate.
I tried to start the motor with the choke on, the motor started, spun up to a high speed and then cut out. After repeating this several more times while also priming and fiddling with the low speed adjustment, the motor started and ran.
It was a bit smoky and smoke or steam started coming out of the water discharge, after a while this turned into water spraying out.
I stopped the motor and then did some spark tests for a few minutes, got strong sparks from both cylinders, the motor was more difficult to start with one cylinder only. I stopped the motor again and left it alone for a few minutes.
I went to start the motor again, I could feel the powerhead was still warm so I didn't use the choke. The motor started and ran but no smoke/steam came out of the water discharge. After 30 to 45 seconds a puff of smoke came out of the water discharge, the motor 'sneezed' and then cut out.
I started it again, this time alot of smoke/steam came out of the water discharge but it wouldn't turn into a stream of water. I began to worry after about 30-45 seconds of this, then the motor 'sneezed' again and cut out.
I started to worry that maybe the sneeze was the pistons binding inside or something being caused by overheating, so I took some water and sprinkled it over the cylinder heads and the water sizzled away. I did this a couple more times to several areas of the head which were also hot and then called it quits; I put the cover back on and left it to cool until tomorrow.
Did I overheat the motor? I had this motor on the water just the other day and it was barely warm to the touch under WOT.