250g trailblazer shuts down after 5 mins

i posted in here a awhile back about this problem got a little help, but never fixed my problem. the welder has been sitting since then and im back at it again. i changed the oil and gas and got it running again. So here is my problem. It starts and runs fine for a few minutes and then shuts off, when it does this it will have no spark. let it sit for awhile and it will start up and do the same thing all over again. i replaced the coil last time to no avail. I was told to bypass the oil level switch which i can't find, and or something about a magnetic sensor that heats up on the flywheel. the serial #'s i can find are onan motor on a silver tag g903711949, and this one on the stamped tag on the front of the welder by the control setting panel ka859915

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