Help with weird problem
 

Been searching for 3 days now with no answers. Have a kazuma 110cc frame with a 150cc smc brand engine. The problem I'm having is that the neutral light sensor will not stay in the engine. And when I'm riding it pops out and oil starts spraying out the hole it belongs in. So I rigged up a thing to hold it. Well it blew out and ripped clean off the wire while riding. What's causing this and what can I fill the hole in with.
https://cimg3.ibsrv.net/gimg/atvconn...9fc31ff1c9.jpg

Pretty sure that bolt hole to the right is suppose to have a bracket in it that goes around the sensor and holds it in.

That bolt hole is for my chain cover. I'm going to check my crank case vent and put silicone in the hole. Something has to be causing pressure.