Originally Posted by
AA5BY
It was the bayonet type that required the spring. The replacement has the compression spring. So, at this point, who knows if the problem at the plug cap caused the problem near the ignition unit or what happened. The ignition unit itself is still firing. Glad that headache is off the work bench and back in the hanger.
With the new ignition the Saito 125 fired up easily and is happy again.
The Bayonet type was made in 2 versions. The early versions were soldered at the 90 degree joint in the cap (with two fairly large blobs of a special soldering material in the ones I had) and the later ones were laser-welde, very nice and clean looks.
I have had faillures with the soldered one (one due to a minor mishap, inverted engine and a nose over in landing causing the plugcap to catch in the grass, the other one due to vibrations. I could repair the one that failed due vibrations). But those repairs did not last "forever" so it got replaced and the repaired unit became my testbench-unit.
But whatever the cause, your Saito being happy again is the most important!